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Satran +Request for Comments: 3720 K. Meth +Category: Standards Track IBM + C. Sapuntzakis + Cisco Systems + M. Chadalapaka + Hewlett-Packard Co. + E. Zeidner + IBM + April 2004 + + + Internet Small Computer Systems Interface (iSCSI) + +Status of this Memo + + This document specifies an Internet standards track protocol for the + Internet community, and requests discussion and suggestions for + improvements. Please refer to the current edition of the "Internet + Official Protocol Standards" (STD 1) for the standardization state + and status of this protocol. Distribution of this memo is unlimited. + +Copyright Notice + + Copyright (C) The Internet Society (2003). All Rights Reserved. + +Abstract + + This document describes a transport protocol for Internet Small + Computer Systems Interface (iSCSI) that works on top of TCP. The + iSCSI protocol aims to be fully compliant with the standardized SCSI + architecture model. + + SCSI is a popular family of protocols that enable systems to + communicate with I/O devices, especially storage devices. SCSI + protocols are request/response application protocols with a common + standardized architecture model and basic command set, as well as + standardized command sets for different device classes (disks, tapes, + media-changers etc.). + + As system interconnects move from the classical bus structure to a + network structure, SCSI has to be mapped to network transport + protocols. IP networks now meet the performance requirements of fast + system interconnects and as such are good candidates to "carry" SCSI. + + + + + + + +Satran, et al. Standards Track [Page 1] + +RFC 3720 iSCSI April 2004 + + +Table of Contents + + 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . 9 + 2. Definitions and Acronyms. . . . . . . . . . . . . . . . . . . 10 + 2.1. Definitions. . . . . . . . . . . . . . . . . . . . . . 10 + 2.2. Acronyms . . . . . . . . . . . . . . . . . . . . . . . 14 + 2.3. Conventions. . . . . . . . . . . . . . . . . . . . . . 16 + 2.3.1. Word Rule. . . . . . . . . . . . . . . . . . 16 + 2.3.2. Half-Word Rule . . . . . . . . . . . . . . . 17 + 2.3.3. Byte Rule. . . . . . . . . . . . . . . . . . 17 + 3. Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . 17 + 3.1. SCSI Concepts. . . . . . . . . . . . . . . . . . . . . 17 + 3.2. iSCSI Concepts and Functional Overview . . . . . . . . 18 + 3.2.1. Layers and Sessions. . . . . . . . . . . . . 19 + 3.2.2. Ordering and iSCSI Numbering . . . . . . . . 19 + 3.2.2.1. Command Numbering and + Acknowledging . . . . . . . . . . 20 + 3.2.2.2. Response/Status Numbering and + Acknowledging . . . . . . . . . . 23 + 3.2.2.3. Data Sequencing . . . . . . . . 24 + 3.2.3. iSCSI Login. . . . . . . . . . . . . . . . . 24 + 3.2.4. iSCSI Full Feature Phase . . . . . . . . . . 25 + 3.2.4.1. Command Connection Allegiance . . 26 + 3.2.4.2. Data Transfer Overview. . . . . . 27 + 3.2.4.3. Tags and Integrity Checks . . . . 28 + 3.2.4.4. Task Management . . . . . . . . . 28 + 3.2.5. iSCSI Connection Termination . . . . . . . . 29 + 3.2.6. iSCSI Names. . . . . . . . . . . . . . . . . 29 + 3.2.6.1. iSCSI Name Properties . . . . . . 30 + 3.2.6.2. iSCSI Name Encoding . . . . . . . 31 + 3.2.6.3. iSCSI Name Structure. . . . . . . 32 + 3.2.6.3.1. Type "iqn." (iSCSI + Qualified Name) . . . 32 + 3.2.6.3.2. Type "eui." (IEEE + EUI-64 format). . . . 34 + 3.2.7. Persistent State . . . . . . . . . . . . . . 34 + 3.2.8. Message Synchronization and Steering . . . . 35 + 3.2.8.1. Sync/Steering and iSCSI PDU + Length . . . . . . . . . . . . . 36 + 3.3. iSCSI Session Types. . . . . . . . . . . . . . . . . . 36 + 3.4. SCSI to iSCSI Concepts Mapping Model . . . . . . . . . 37 + 3.4.1. iSCSI Architecture Model . . . . . . . . . . 37 + 3.4.2. SCSI Architecture Model. . . . . . . . . . . 39 + 3.4.3. Consequences of the Model. . . . . . . . . . 41 + 3.4.3.1. I_T Nexus State . . . . . . . . . 42 + 3.5. Request/Response Summary . . . . . . . . . . . . . . . 42 + 3.5.1. Request/Response Types Carrying SCSI Payload 43 + 3.5.1.1. SCSI-Command . . . . . . . . . . 43 + + + +Satran, et al. Standards Track [Page 2] + +RFC 3720 iSCSI April 2004 + + + 3.5.1.2. SCSI-Response . . . . . . . . . 43 + 3.5.1.3. Task Management Function Request. 44 + 3.5.1.4. Task Management Function Response 44 + 3.5.1.5. SCSI Data-Out and SCSI Data-In. . 44 + 3.5.1.6. Ready To Transfer (R2T) . . . . . 45 + 3.5.2. Requests/Responses carrying SCSI and iSCSI + Payload. . . . . . . . . . . . . . . . . . . 46 + 3.5.2.1. Asynchronous Message. . . . . . . 46 + 3.5.3. Requests/Responses Carrying iSCSI Only + Payload. . . . . . . . . . . . . . . . . . . 46 + 3.5.3.1. Text Request and Text Response. . 46 + 3.5.3.2. Login Request and Login Response. 47 + 3.5.3.3. Logout Request and Response . . . 47 + 3.5.3.4. SNACK Request . . . . . . . . . . 48 + 3.5.3.5. Reject. . . . . . . . . . . . . . 48 + 3.5.3.6. NOP-Out Request and NOP-In + Response . . . . . . . . . . . . 48 + 4. SCSI Mode Parameters for iSCSI. . . . . . . . . . . . . . . . 48 + 5. Login and Full Feature Phase Negotiation. . . . . . . . . . . 48 + 5.1. Text Format. . . . . . . . . . . . . . . . . . . . . . 50 + 5.2. Text Mode Negotiation. . . . . . . . . . . . . . . . . 53 + 5.2.1. List negotiations. . . . . . . . . . . . . . 56 + 5.2.2. Simple-value Negotiations. . . . . . . . . . 56 + 5.3. Login Phase. . . . . . . . . . . . . . . . . . . . . . 57 + 5.3.1. Login Phase Start. . . . . . . . . . . . . . 60 + 5.3.2. iSCSI Security Negotiation . . . . . . . . . 62 + 5.3.3. Operational Parameter Negotiation During + the Login Phase. . . . . . . . . . . . . . . 63 + 5.3.4. Connection Reinstatement . . . . . . . . . . 64 + 5.3.5. Session Reinstatement, Closure, and Timeout. 64 + 5 5.3.5.1. Loss of Nexus + Notification. . . . . 65 + 5.3.6. Session Continuation and Failure . . . . . . 65 + 5.4. Operational Parameter Negotiation Outside the Login + Phase. . . . . . . . . . . . . . . . . . . . . . . . . 66 + 6. iSCSI Error Handling and Recovery . . . . . . . . . . . . . . 67 + 6.1. Overview . . . . . . . . . . . . . . . . . . . . . . . 67 + 6.1.1. Background . . . . . . . . . . . . . . . . . 67 + 6.1.2. Goals. . . . . . . . . . . . . . . . . . . . 67 + 6.1.3. Protocol Features and State Expectations . . 68 + 6.1.4. Recovery Classes . . . . . . . . . . . . . . 69 + 6.1.4.1. Recovery Within-command . . . . . 69 + 6.1.4.2. Recovery Within-connection. . . . 70 + 6.1.4.3. Connection Recovery . . . . . . . 71 + 6.1.4.4. Session Recovery. . . . . . . . . 72 + 6.1.5. Error Recovery Hierarchy . . . . . . . . . . . 72 + 6.2. Retry and Reassign in Recovery . . . . . . . . . . . . 74 + 6.2.1. Usage of Retry . . . . . . . . . . . . . . . 74 + + + +Satran, et al. Standards Track [Page 3] + +RFC 3720 iSCSI April 2004 + + + 6.2.2. Allegiance Reassignment. . . . . . . . . . . 75 + 6.3. Usage Of Reject PDU in Recovery. . . . . . . . . . . . 76 + 6.4. Connection Timeout Management. . . . . . . . . . . . . 76 + 6.4.1. Timeouts on Transport Exception Events . . . 77 + 6.4.2. Timeouts on Planned Decommissioning. . . . . 77 + 6.5. Implicit Termination of Tasks. . . . . . . . . . . . . 77 + 6.6. Format Errors. . . . . . . . . . . . . . . . . . . . . 78 + 6.7. Digest Errors. . . . . . . . . . . . . . . . . . . . . 78 + 6.8. Sequence Errors. . . . . . . . . . . . . . . . . . . . 80 + 6.9. SCSI Timeouts. . . . . . . . . . . . . . . . . . . . . 81 + 6.10. Negotiation Failures . . . . . . . . . . . . . . . . . 81 + 6.11. Protocol Errors. . . . . . . . . . . . . . . . . . . . 82 + 6.12. Connection Failures. . . . . . . . . . . . . . . . . . 82 + 6.13. Session Errors . . . . . . . . . . . . . . . . . . . . 83 + 7. State Transitions . . . . . . . . . . . . . . . . . . . . . . 84 + 7.1. Standard Connection State Diagrams . . . . . . . . . . 84 + 7.1.1. State Descriptions for Initiators and + Targets. . . . . . . . . . . . . . . . . . . 84 + 7.1.2. State Transition Descriptions for Initiators + and Targets. . . . . . . . . . . . . . . . . 85 + 7.1.3. Standard Connection State Diagram for an + Initiator. . . . . . . . . . . . . . . . . . 88 + 7.1.4. Standard Connection State Diagram for a + Target . . . . . . . . . . . . . . . . . . . 90 + 7.2. Connection Cleanup State Diagram for Initiators and + Targets. . . . . . . . . . . . . . . . . . . . . . . . 92 + 7.2.1. State Descriptions for Initiators and + Targets. . . . . . . . . . . . . . . . . . . 94 + 7.2.2. State Transition Descriptions for Initiators + and Targets. . . . . . . . . . . . . . . . . 94 + 7.3. Session State Diagrams . . . . . . . . . . . . . . . . 95 + 7.3.1. Session State Diagram for an Initiator . . . 95 + 7.3.2. Session State Diagram for a Target . . . . . 96 + 7.3.3. State Descriptions for Initiators and + Targets. . . . . . . . . . . . . . . . . . . 97 + 7.3.4. State Transition Descriptions for Initiators + and Targets. . . . . . . . . . . . . . . . . 98 + 8. Security Considerations . . . . . . . . . . . . . . . . . . . 99 + 8.1. iSCSI Security Mechanisms. . . . . . . . . . . . . . . 100 + 8.2. In-band Initiator-Target Authentication. . . . . . . . 100 + 8.2.1. CHAP Considerations. . . . . . . . . . . . . 101 + 8.2.2. SRP Considerations . . . . . . . . . . . . . 103 + 8.3. IPsec. . . . . . . . . . . . . . . . . . . . . . . . . 104 + 8.3.1. Data Integrity and Authentication. . . . . . 104 + 8.3.2. Confidentiality. . . . . . . . . . . . . . . 105 + 8.3.3. Policy, Security Associations, and + Cryptographic Key Management . . . . . . . . 105 + 9. Notes to Implementers . . . . . . . . . . . . . . . . . . . . 106 + + + +Satran, et al. Standards Track [Page 4] + +RFC 3720 iSCSI April 2004 + + + 9.1. Multiple Network Adapters. . . . . . . . . . . . . . . 106 + 9.1.1. Conservative Reuse of ISIDs. . . . . . . . . 107 + 9.1.2. iSCSI Name, ISID, and TPGT Use . . . . . . . 107 + 9.2. Autosense and Auto Contingent Allegiance (ACA) . . . . 109 + 9.3. iSCSI Timeouts . . . . . . . . . . . . . . . . . . . . 109 + 9.4. Command Retry and Cleaning Old Command Instances . . . 110 + 9.5. Synch and Steering Layer and Performance . . . . . . . 110 + 9.6. Considerations for State-dependent Devices and + Long-lasting SCSI Operations . . . . . . . . . . . . . 111 + 9.6.1. Determining the Proper ErrorRecoveryLevel. . 112 + 10. iSCSI PDU Formats . . . . . . . . . . . . . . . . . . . . . . 112 + 10.1. iSCSI PDU Length and Padding . . . . . . . . . . . . . 113 + 10.2. PDU Template, Header, and Opcodes. . . . . . . . . . . 113 + 10.2.1. Basic Header Segment (BHS) . . . . . . . . . 114 + 10.2.1.1. I . . . . . . . . . . . . . . . . 115 + 10.2.1.2. Opcode. . . . . . . . . . . . . . 115 + 10.2.1.3. Final (F) bit . . . . . . . . . . 116 + 10.2.1.4. Opcode-specific Fields. . . . . . 116 + 10.2.1.5. TotalAHSLength. . . . . . . . . . 116 + 10.2.1.6. DataSegmentLength . . . . . . . . 116 + 10.2.1.7. LUN . . . . . . . . . . . . . . . 116 + 10.2.1.8. Initiator Task Tag. . . . . . . . 117 + 10.2.2. Additional Header Segment (AHS) . . . . . . . 117 + 10.2.2.1. AHSType . . . . . . . . . . . . . 117 + 10.2.2.2. AHSLength . . . . . . . . . . . . 117 + 10.2.2.3. Extended CDB AHS. . . . . . . . . 118 + 10.2.2.4. Bidirectional Expected Read-Data + Length AHS. . . . . . . . . . . . 118 + 10.2.3. Header Digest and Data Digest. . . . . . . . 118 + 10.2.4. Data Segment . . . . . . . . . . . . . . . . 119 + 10.3. SCSI Command . . . . . . . . . . . . . . . . . . . . . 119 + 10.3.1. Flags and Task Attributes (byte 1) . . . . . 120 + 10.3.2. CmdSN - Command Sequence Number. . . . . . . 120 + 10.3.3. ExpStatSN. . . . . . . . . . . . . . . . . . 120 + 10.3.4. Expected Data Transfer Length. . . . . . . . 121 + 10.3.5. CDB - SCSI Command Descriptor Block. . . . . 121 + 10.3.6. Data Segment - Command Data. . . . . . . . . 121 + 10.4. SCSI Response. . . . . . . . . . . . . . . . . . . . . 122 + 10.4.1. Flags (byte 1) . . . . . . . . . . . . . . . 123 + 10.4.2. Status . . . . . . . . . . . . . . . . . . . 123 + 10.4.3. Response . . . . . . . . . . . . . . . . . . 124 + 10.4.4. SNACK Tag. . . . . . . . . . . . . . . . . . 125 + 10.4.5. Residual Count . . . . . . . . . . . . . . . 125 + 10.4.6. Bidirectional Read Residual Count. . . . . . 125 + 10.4.7. Data Segment - Sense and Response Data + Segment. . . . . . . . . . . . . . . . . . . 125 + 10.4.7.1. SenseLength . . . . . . . . . . . 126 + 10.4.7.2. Sense Data. . . . . . . . . . . . 126 + + + +Satran, et al. Standards Track [Page 5] + +RFC 3720 iSCSI April 2004 + + + 10.4.8. ExpDataSN. . . . . . . . . . . . . . . . . . 127 + 10.4.9. StatSN - Status Sequence Number. . . . . . . 127 + 10.4.10. ExpCmdSN - Next Expected CmdSN from this + Initiator. . . . . . . . . . . . . . . . . . 128 + 10.4.11. MaxCmdSN - Maximum CmdSN from this Initiator 128 + 10.5. Task Management Function Request . . . . . . . . . . . 129 + 10.5.1. Function . . . . . . . . . . . . . . . . . . 129 + 10.5.2. TotalAHSLength and DataSegmentLength . . . . 132 + 10.5.3. LUN. . . . . . . . . . . . . . . . . . . . . 132 + 10.5.4. Referenced Task Tag. . . . . . . . . . . . . 132 + 10.5.5. RefCmdSN . . . . . . . . . . . . . . . . . . 132 + 10.5.6. ExpDataSN. . . . . . . . . . . . . . . . . . 133 + 10.6. Task Management Function Response. . . . . . . . . . . 134 + 10.6.1. Response . . . . . . . . . . . . . . . . . . 134 + 10.6.2. Task Management Actions on Task Sets . . . . 136 + 10.6.3. TotalAHSLength and DataSegmentLength . . . . 137 + 10.7. SCSI Data-Out & SCSI Data-In . . . . . . . . . . . . . 137 + 10.7.1. F (Final) Bit. . . . . . . . . . . . . . . . 139 + 10.7.2. A (Acknowledge) Bit. . . . . . . . . . . . . 139 + 10.7.3. Flags (byte 1) . . . . . . . . . . . . . . . 140 + 10.7.4. Target Transfer Tag and LUN. . . . . . . . . 140 + 10.7.5. DataSN . . . . . . . . . . . . . . . . . . . 141 + 10.7.6. Buffer Offset. . . . . . . . . . . . . . . . 141 + 10.7.7. DataSegmentLength. . . . . . . . . . . . . . 141 + 10.8. Ready To Transfer (R2T). . . . . . . . . . . . . . . . 142 + 10.8.1. TotalAHSLength and DataSegmentLength . . . . 143 + 10.8.2. R2TSN. . . . . . . . . . . . . . . . . . . . 143 + 10.8.3. StatSN . . . . . . . . . . . . . . . . . . . 144 + 10.8.4. Desired Data Transfer Length and Buffer + Offset . . . . . . . . . . . . . . . . . . . 144 + 10.8.5. Target Transfer Tag. . . . . . . . . . . . . 144 + 10.9. Asynchronous Message . . . . . . . . . . . . . . . . . 145 + 10.9.1. AsyncEvent . . . . . . . . . . . . . . . . . 146 + 10.9.2. AsyncVCode . . . . . . . . . . . . . . . . . 147 + 10.9.3. LUN. . . . . . . . . . . . . . . . . . . . . 147 + 10.9.4. Sense Data and iSCSI Event Data. . . . . . . 148 + 10.9.4.1. SenseLength . . . . . . . . . . . 148 + 10.10. Text Request . . . . . . . . . . . . . . . . . . . . . 149 + 10.10.1. F (Final) Bit. . . . . . . . . . . . . . . . 150 + 10.10.2. C (Continue) Bit . . . . . . . . . . . . . . 150 + 10.10.3. Initiator Task Tag . . . . . . . . . . . . . 150 + 10.10.4. Target Transfer Tag. . . . . . . . . . . . . 150 + 10.10.5. Text . . . . . . . . . . . . . . . . . . . . 151 + 10.11. Text Response. . . . . . . . . . . . . . . . . . . . . 152 + 10.11.1. F (Final) Bit. . . . . . . . . . . . . . . . 152 + 10.11.2. C (Continue) Bit . . . . . . . . . . . . . . 153 + 10.11.3. Initiator Task Tag . . . . . . . . . . . . . 153 + 10.11.4. Target Transfer Tag. . . . . . . . . . . . . 153 + + + +Satran, et al. Standards Track [Page 6] + +RFC 3720 iSCSI April 2004 + + + 10.11.5. StatSN . . . . . . . . . . . . . . . . . . . 154 + 10.11.6. Text Response Data . . . . . . . . . . . . . 154 + 10.12. Login Request. . . . . . . . . . . . . . . . . . . . . 154 + 10.12.1. T (Transit) Bit. . . . . . . . . . . . . . . 155 + 10.12.2. C (Continue) Bit . . . . . . . . . . . . . . 155 + 10.12.3. CSG and NSG. . . . . . . . . . . . . . . . . 156 + 10.12.4. Version. . . . . . . . . . . . . . . . . . . 156 + 10.12.4.1. Version-max. . . . . . . . . . . 156 + 10.12.4.2. Version-min. . . . . . . . . . . 156 + 10.12.5. ISID . . . . . . . . . . . . . . . . . . . . 157 + 10.12.6. TSIH . . . . . . . . . . . . . . . . . . . . 158 + 10.12.7. Connection ID - CID. . . . . . . . . . . . . 158 + 10.12.8. CmdSN. . . . . . . . . . . . . . . . . . . . 159 + 10.12.9. ExpStatSN. . . . . . . . . . . . . . . . . . 159 + 10.12.10. Login Parameters . . . . . . . . . . . . . . 159 + 10.13. Login Response . . . . . . . . . . . . . . . . . . . . 160 + 10.13.1. Version-max. . . . . . . . . . . . . . . . . 160 + 10.13.2. Version-active . . . . . . . . . . . . . . . 161 + 10.13.3. TSIH . . . . . . . . . . . . . . . . . . . . 161 + 10.13.4. StatSN . . . . . . . . . . . . . . . . . . . 161 + 10.13.5. Status-Class and Status-Detail . . . . . . . 161 + 10.13.6. T (Transit) Bit. . . . . . . . . . . . . . . 164 + 10.13.7. C (Continue) Bit . . . . . . . . . . . . . . 164 + 10.13.8. Login Parameters . . . . . . . . . . . . . . 164 + 10.14. Logout Request . . . . . . . . . . . . . . . . . . . . 165 + 10.14.1. Reason Code. . . . . . . . . . . . . . . . . 167 + 10.14.2. TotalAHSLength and DataSegmentLength . . . . 168 + 10.14.3. CID. . . . . . . . . . . . . . . . . . . . . 168 + 10.14.4. ExpStatSN. . . . . . . . . . . . . . . . . . 168 + 10.14.5. Implicit termination of tasks. . . . . . . . 168 + 10.15. Logout Response. . . . . . . . . . . . . . . . . . . . 169 + 10.15.1. Response . . . . . . . . . . . . . . . . . . 170 + 10.15.2. TotalAHSLength and DataSegmentLength . . . . 170 + 10.15.3. Time2Wait. . . . . . . . . . . . . . . . . . 170 + 10.15.4. Time2Retain. . . . . . . . . . . . . . . . . 170 + 10.16. SNACK Request. . . . . . . . . . . . . . . . . . . . . 171 + 10.16.1. Type . . . . . . . . . . . . . . . . . . . . 172 + 10.16.2. Data Acknowledgement . . . . . . . . . . . . 173 + 10.16.3. Resegmentation . . . . . . . . . . . . . . . 173 + 10.16.4. Initiator Task Tag . . . . . . . . . . . . . 174 + 10.16.5. Target Transfer Tag or SNACK Tag . . . . . . 174 + 10.16.6. BegRun . . . . . . . . . . . . . . . . . . . 174 + 10.16.7. RunLength. . . . . . . . . . . . . . . . . . 174 + 10.17. Reject . . . . . . . . . . . . . . . . . . . . . . . . 175 + 10.17.1. Reason . . . . . . . . . . . . . . . . . . . 176 + 10.17.2. DataSN/R2TSN . . . . . . . . . . . . . . . . 177 + 10.17.3. StatSN, ExpCmdSN and MaxCmdSN. . . . . . . . 177 + 10.17.4. Complete Header of Bad PDU . . . . . . . . . 177 + + + +Satran, et al. Standards Track [Page 7] + +RFC 3720 iSCSI April 2004 + + + 10.18. NOP-Out. . . . . . . . . . . . . . . . . . . . . . . . 178 + 10.18.1. Initiator Task Tag . . . . . . . . . . . . . 179 + 10.18.2. Target Transfer Tag. . . . . . . . . . . . . 179 + 10.18.3. Ping Data. . . . . . . . . . . . . . . . . . 179 + 10.19. NOP-In . . . . . . . . . . . . . . . . . . . . . . . . 180 + 10.19.1. Target Transfer Tag. . . . . . . . . . . . . 181 + 10.19.2. StatSN . . . . . . . . . . . . . . . . . . . 181 + 10.19.3. LUN. . . . . . . . . . . . . . . . . . . . . 181 + 11. iSCSI Security Text Keys and Authentication Methods . . . . . 181 + 11.1. AuthMethod . . . . . . . . . . . . . . . . . . . . . . 182 + 11.1.1. Kerberos . . . . . . . . . . . . . . . . . . 184 + 11.1.2. Simple Public-Key Mechanism (SPKM) . . . . . 184 + 11.1.3. Secure Remote Password (SRP) . . . . . . . . 185 + 11.1.4. Challenge Handshake Authentication Protocol + (CHAP) . . . . . . . . . . . . . . . . . . . 186 + 12. Login/Text Operational Text Keys. . . . . . . . . . . . . . . 187 + 12.1. HeaderDigest and DataDigest. . . . . . . . . . . . . . 188 + 12.2. MaxConnections . . . . . . . . . . . . . . . . . . . . 190 + 12.3. SendTargets. . . . . . . . . . . . . . . . . . . . . . 191 + 12.4. TargetName . . . . . . . . . . . . . . . . . . . . . . 191 + 12.5. InitiatorName. . . . . . . . . . . . . . . . . . . . . 192 + 12.6. TargetAlias. . . . . . . . . . . . . . . . . . . . . . 192 + 12.7. InitiatorAlias . . . . . . . . . . . . . . . . . . . . 193 + 12.8. TargetAddress. . . . . . . . . . . . . . . . . . . . . 193 + 12.9. TargetPortalGroupTag . . . . . . . . . . . . . . . . . 194 + 12.10. InitialR2T . . . . . . . . . . . . . . . . . . . . . . 194 + 12.11. ImmediateData. . . . . . . . . . . . . . . . . . . . . 195 + 12.12. MaxRecvDataSegmentLength . . . . . . . . . . . . . . . 196 + 12.13. MaxBurstLength . . . . . . . . . . . . . . . . . . . . 196 + 12.14. FirstBurstLength . . . . . . . . . . . . . . . . . . . 197 + 12.15. DefaultTime2Wait . . . . . . . . . . . . . . . . . . . 197 + 12.16. DefaultTime2Retain . . . . . . . . . . . . . . . . . . 198 + 12.17. MaxOutstandingR2T. . . . . . . . . . . . . . . . . . . 198 + 12.18. DataPDUInOrder . . . . . . . . . . . . . . . . . . . . 198 + 12.19. DataSequenceInOrder. . . . . . . . . . . . . . . . . . 199 + 12.20. ErrorRecoveryLevel . . . . . . . . . . . . . . . . . . 199 + 12.21. SessionType. . . . . . . . . . . . . . . . . . . . . . 200 + 12.22. The Private or Public Extension Key Format . . . . . . 200 + 13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 201 + 13.1. Naming Requirements. . . . . . . . . . . . . . . . . . 203 + 13.2. Mechanism Specification Requirements . . . . . . . . . 203 + 13.3. Publication Requirements . . . . . . . . . . . . . . . 203 + 13.4. Security Requirements. . . . . . . . . . . . . . . . . 203 + 13.5. Registration Procedure . . . . . . . . . . . . . . . . 204 + 13.5.1. Present the iSCSI extension item to the + Community. . . . . . . . . . . . . . . . . . 204 + 13.5.2. iSCSI extension item review and IESG + approval . . . . . . . . . . . . . . . . . . 204 + + + +Satran, et al. Standards Track [Page 8] + +RFC 3720 iSCSI April 2004 + + + 13.5.3. IANA Registration. . . . . . . . . . . . . . 204 + 13.5.4. Standard iSCSI extension item-label format . 204 + 13.6. IANA Procedures for Registering iSCSI extension items. 205 + References. . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 + Appendix A. Sync and Steering with Fixed Interval Markers . . . . 209 + A.1. Markers At Fixed Intervals . . . . . . . . . . . . . . 209 + A.2. Initial Marker-less Interval . . . . . . . . . . . . . 210 + A.3. Negotiation. . . . . . . . . . . . . . . . . . . . . . 210 + A.3.1. OFMarker, IFMarker . . . . . . . . . . . . . 210 + A.3.2. OFMarkInt, IFMarkInt . . . . . . . . . . . . 211 + Appendix B. Examples . . . . . . . . . . . . . . . . . . . . . . 212 + B.1. Read Operation Example . . . . . . . . . . . . . . . . 212 + B.2. Write Operation Example. . . . . . . . . . . . . . . . 213 + B.3. R2TSN/DataSN Use Examples. . . . . . . . . . . . . . . 214 + B.4. CRC Examples . . . . . . . . . . . . . . . . . . . . . 217 + Appendix C. Login Phase Examples . . . . . . . . . . . . . . . . 219 + Appendix D. SendTargets Operation. . . . . . . . . . . . . . . . 229 + Appendix E. Algorithmic Presentation of Error Recovery Classes . 233 + E.1. General Data Structure and Procedure Description . . . 233 + E.2. Within-command Error Recovery Algorithms . . . . . . . 234 + E.2.1. Procedure Descriptions . . . . . . . . . . . 234 + E.2.2. Initiator Algorithms . . . . . . . . . . . . 235 + E.2.3. Target Algorithms. . . . . . . . . . . . . . 237 + E.3. Within-connection Recovery Algorithms. . . . . . . . . 240 + E.3.1. Procedure Descriptions . . . . . . . . . . . 240 + E.3.2. Initiator Algorithms . . . . . . . . . . . . 241 + E.3.3. Target Algorithms. . . . . . . . . . . . . . 243 + E.4. Connection Recovery Algorithms . . . . . . . . . . . . 243 + E.4.1. Procedure Descriptions . . . . . . . . . . . 243 + E.4.2. Initiator Algorithms . . . . . . . . . . . . 244 + E.4.3. Target Algorithms. . . . . . . . . . . . . . 246 + Appendix F. Clearing Effects of Various Events on Targets. . . . 249 + F.1. Clearing Effects on iSCSI Objects. . . . . . . . . . . 249 + F.2. Clearing Effects on SCSI Objects . . . . . . . . . . . 253 + Acknowledgements. . . . . . . . . . . . . . . . . . . . . . . . . 254 + Authors' Addresses. . . . . . . . . . . . . . . . . . . . . . . . 256 + Full Copyright Statement. . . . . . . . . . . . . . . . . . . . . 257 + +1. Introduction + + The Small Computer Systems Interface (SCSI) is a popular family of + protocols for communicating with I/O devices, especially storage + devices. SCSI is a client-server architecture. Clients of a SCSI + interface are called "initiators". Initiators issue SCSI "commands" + to request services from components, logical units of a server known + as a "target". A "SCSI transport" maps the client-server SCSI + protocol to a specific interconnect. An Initiator is one endpoint of + a SCSI transport and a target is the other endpoint. + + + +Satran, et al. Standards Track [Page 9] + +RFC 3720 iSCSI April 2004 + + + The SCSI protocol has been mapped over various transports, including + Parallel SCSI, IPI, IEEE-1394 (firewire) and Fibre Channel. These + transports are I/O specific and have limited distance capabilities. + + The iSCSI protocol defined in this document describes a means of + transporting SCSI packets over TCP/IP (see [RFC791], [RFC793], + [RFC1035], [RFC1122]), providing for an interoperable solution which + can take advantage of existing Internet infrastructure, Internet + management facilities, and address distance limitations. + +2. Definitions and Acronyms + +2.1. Definitions + + - Alias: An alias string can also be associated with an iSCSI Node. + The alias allows an organization to associate a user-friendly + string with the iSCSI Name. However, the alias string is not a + substitute for the iSCSI Name. + + - CID (Connection ID): Connections within a session are identified by + a connection ID. It is a unique ID for this connection within the + session for the initiator. It is generated by the initiator and + presented to the target during login requests and during logouts + that close connections. + + - Connection: A connection is a TCP connection. Communication + between the initiator and target occurs over one or more TCP + connections. The TCP connections carry control messages, SCSI + commands, parameters, and data within iSCSI Protocol Data Units + (iSCSI PDUs). + + - iSCSI Device: A SCSI Device using an iSCSI service delivery + subsystem. Service Delivery Subsystem is defined by [SAM2] as a + transport mechanism for SCSI commands and responses. + + - iSCSI Initiator Name: The iSCSI Initiator Name specifies the + worldwide unique name of the initiator. + + - iSCSI Initiator Node: The "initiator". The word "initiator" has + been appropriately qualified as either a port or a device in the + rest of the document when the context is ambiguous. All + unqualified usages of "initiator" refer to an initiator port (or + device) depending on the context. + + - iSCSI Layer: This layer builds/receives iSCSI PDUs and + relays/receives them to/from one or more TCP connections that form + an initiator-target "session". + + + + +Satran, et al. Standards Track [Page 10] + +RFC 3720 iSCSI April 2004 + + + - iSCSI Name: The name of an iSCSI initiator or iSCSI target. + + - iSCSI Node: The iSCSI Node represents a single iSCSI initiator or + iSCSI target. There are one or more iSCSI Nodes within a Network + Entity. The iSCSI Node is accessible via one or more Network + Portals. An iSCSI Node is identified by its iSCSI Name. The + separation of the iSCSI Name from the addresses used by and for the + iSCSI Node allows multiple iSCSI Nodes to use the same address, and + the same iSCSI Node to use multiple addresses. + + - iSCSI Target Name: The iSCSI Target Name specifies the worldwide + unique name of the target. + + - iSCSI Target Node: The "target". + + - iSCSI Task: An iSCSI task is an iSCSI request for which a response + is expected. + + - iSCSI Transfer Direction: The iSCSI transfer direction is defined + with regard to the initiator. Outbound or outgoing transfers are + transfers from the initiator to the target, while inbound or + incoming transfers are from the target to the initiator. + + - ISID: The initiator part of the Session Identifier. It is + explicitly specified by the initiator during Login. + + - I_T nexus: According to [SAM2], the I_T nexus is a relationship + between a SCSI Initiator Port and a SCSI Target Port. For iSCSI, + this relationship is a session, defined as a relationship between + an iSCSI Initiator's end of the session (SCSI Initiator Port) and + the iSCSI Target's Portal Group. The I_T nexus can be identified + by the conjunction of the SCSI port names; that is, the I_T nexus + identifier is the tuple (iSCSI Initiator Name + ',i,'+ ISID, iSCSI + Target Name + ',t,'+ Portal Group Tag). + + - Network Entity: The Network Entity represents a device or gateway + that is accessible from the IP network. A Network Entity must have + one or more Network Portals, each of which can be used to gain + access to the IP network by some iSCSI Nodes contained in that + Network Entity. + + - Network Portal: The Network Portal is a component of a Network + Entity that has a TCP/IP network address and that may be used by an + iSCSI Node within that Network Entity for the connection(s) within + one of its iSCSI sessions. A Network Portal in an initiator is + identified by its IP address. A Network Portal in a target is + identified by its IP address and its listening TCP port. + + + + +Satran, et al. Standards Track [Page 11] + +RFC 3720 iSCSI April 2004 + + + - Originator: In a negotiation or exchange, the party that initiates + the negotiation or exchange. + + - PDU (Protocol Data Unit): The initiator and target divide their + communications into messages. The term "iSCSI protocol data unit" + (iSCSI PDU) is used for these messages. + + - Portal Groups: iSCSI supports multiple connections within the same + session; some implementations will have the ability to combine + connections in a session across multiple Network Portals. A Portal + Group defines a set of Network Portals within an iSCSI Network + Entity that collectively supports the capability of coordinating a + session with connections spanning these portals. Not all Network + Portals within a Portal Group need participate in every session + connected through that Portal Group. One or more Portal Groups may + provide access to an iSCSI Node. Each Network Portal, as utilized + by a given iSCSI Node, belongs to exactly one portal group within + that node. + + - Portal Group Tag: This 16-bit quantity identifies a Portal Group + within an iSCSI Node. All Network Portals with the same portal + group tag in the context of a given iSCSI Node are in the same + Portal Group. + + - Recovery R2T: An R2T generated by a target upon detecting the loss + of one or more Data-Out PDUs through one of the following means: a + digest error, a sequence error, or a sequence reception timeout. A + recovery R2T carries the next unused R2TSN, but requests all or + part of the data burst that an earlier R2T (with a lower R2TSN) had + already requested. + + - Responder: In a negotiation or exchange, the party that responds to + the originator of the negotiation or exchange. + + - SCSI Device: This is the SAM2 term for an entity that contains one + or more SCSI ports that are connected to a service delivery + subsystem and supports a SCSI application protocol. For example, a + SCSI Initiator Device contains one or more SCSI Initiator Ports and + zero or more application clients. A Target Device contains one or + more SCSI Target Ports and one or more device servers and + associated logical units. For iSCSI, the SCSI Device is the + component within an iSCSI Node that provides the SCSI + functionality. As such, there can be at most, one SCSI Device + within a given iSCSI Node. Access to the SCSI Device can only be + achieved in an iSCSI normal operational session. The SCSI Device + Name is defined to be the iSCSI Name of the node. + + + + + +Satran, et al. Standards Track [Page 12] + +RFC 3720 iSCSI April 2004 + + + - SCSI Layer: This builds/receives SCSI CDBs (Command Descriptor + Blocks) and relays/receives them with the remaining command execute + [SAM2] parameters to/from the iSCSI Layer. + + - Session: The group of TCP connections that link an initiator with a + target form a session (loosely equivalent to a SCSI I-T nexus). + TCP connections can be added and removed from a session. Across + all connections within a session, an initiator sees one and the + same target. + + - SCSI Initiator Port: This maps to the endpoint of an iSCSI normal + operational session. An iSCSI normal operational session is + negotiated through the login process between an iSCSI initiator + node and an iSCSI target node. At successful completion of this + process, a SCSI Initiator Port is created within the SCSI Initiator + Device. The SCSI Initiator Port Name and SCSI Initiator Port + Identifier are both defined to be the iSCSI Initiator Name together + with (a) a label that identifies it as an initiator port + name/identifier and (b) the ISID portion of the session identifier. + + - SCSI Port: This is the SAM2 term for an entity in a SCSI Device + that provides the SCSI functionality to interface with a service + delivery subsystem. For iSCSI, the definition of the SCSI + Initiator Port and the SCSI Target Port are different. + + - SCSI Port Name: A name made up as UTF-8 [RFC2279] characters and + includes the iSCSI Name + 'i' or 't' + ISID or Portal Group Tag. + + + - SCSI Target Port: This maps to an iSCSI Target Portal Group. + + - SCSI Target Port Name and SCSI Target Port Identifier: These are + both defined to be the iSCSI Target Name together with (a) a label + that identifies it as a target port name/identifier and (b) the + portal group tag. + + - SSID (Session ID): A session between an iSCSI initiator and an + iSCSI target is defined by a session ID that is a tuple composed of + an initiator part (ISID) and a target part (Target Portal Group + Tag). The ISID is explicitly specified by the initiator at session + establishment. The Target Portal Group Tag is implied by the + initiator through the selection of the TCP endpoint at connection + establishment. The TargetPortalGroupTag key must also be returned + by the target as a confirmation during connection establishment + when TargetName is given. + + - Target Portal Group Tag: A numerical identifier (16-bit) for an + iSCSI Target Portal Group. + + + +Satran, et al. Standards Track [Page 13] + +RFC 3720 iSCSI April 2004 + + + - TSIH (Target Session Identifying Handle): A target assigned tag for + a session with a specific named initiator. The target generates it + during session establishment. Its internal format and content are + not defined by this protocol, except for the value 0 that is + reserved and used by the initiator to indicate a new session. It + is given to the target during additional connection establishment + for the same session. + +2.2. Acronyms + + Acronym Definition + ------------------------------------------------------------ + 3DES Triple Data Encryption Standard + ACA Auto Contingent Allegiance + AEN Asynchronous Event Notification + AES Advanced Encryption Standard + AH Additional Header (not the IPsec AH!) + AHS Additional Header Segment + API Application Programming Interface + ASC Additional Sense Code + ASCII American Standard Code for Information Interchange + ASCQ Additional Sense Code Qualifier + BHS Basic Header Segment + CBC Cipher Block Chaining + CD Compact Disk + CDB Command Descriptor Block + CHAP Challenge Handshake Authentication Protocol + CID Connection ID + CO Connection Only + CRC Cyclic Redundancy Check + CRL Certificate Revocation List + CSG Current Stage + CSM Connection State Machine + DES Data Encryption Standard + DNS Domain Name Server + DOI Domain of Interpretation + DVD Digital Versatile Disk + ESP Encapsulating Security Payload + EUI Extended Unique Identifier + FFP Full Feature Phase + FFPO Full Feature Phase Only + FIM Fixed Interval Marker + Gbps Gigabits per Second + HBA Host Bus Adapter + HMAC Hashed Message Authentication Code + I_T Initiator_Target + I_T_L Initiator_Target_LUN + IANA Internet Assigned Numbers Authority + + + +Satran, et al. Standards Track [Page 14] + +RFC 3720 iSCSI April 2004 + + + ID Identifier + IDN Internationalized Domain Name + IEEE Institute of Electrical & Electronics Engineers + IETF Internet Engineering Task Force + IKE Internet Key Exchange + I/O Input - Output + IO Initialize Only + IP Internet Protocol + IPsec Internet Protocol Security + IPv4 Internet Protocol Version 4 + IPv6 Internet Protocol Version 6 + IQN iSCSI Qualified Name + ISID Initiator Session ID + ITN iSCSI Target Name + ITT Initiator Task Tag + KRB5 Kerberos V5 + LFL Lower Functional Layer + LTDS Logical-Text-Data-Segment + LO Leading Only + LU Logical Unit + LUN Logical Unit Number + MAC Message Authentication Codes + NA Not Applicable + NIC Network Interface Card + NOP No Operation + NSG Next Stage + OS Operating System + PDU Protocol Data Unit + PKI Public Key Infrastructure + R2T Ready To Transfer + R2TSN Ready To Transfer Sequence Number + RDMA Remote Direct Memory Access + RFC Request For Comments + SAM SCSI Architecture Model + SAM2 SCSI Architecture Model - 2 + SAN Storage Area Network + SCSI Small Computer Systems Interface + SN Sequence Number + SNACK Selective Negative Acknowledgment - also + Sequence Number Acknowledgement for data + SPKM Simple Public-Key Mechanism + SRP Secure Remote Password + SSID Session ID + SW Session Wide + TCB Task Control Block + TCP Transmission Control Protocol + TPGT Target Portal Group Tag + TSIH Target Session Identifying Handle + + + +Satran, et al. Standards Track [Page 15] + +RFC 3720 iSCSI April 2004 + + + TTT Target Transfer Tag + UFL Upper Functional Layer + ULP Upper Level Protocol + URN Uniform Resource Names [RFC2396] + UTF Universal Transformation Format + WG Working Group + +2.3. Conventions + + In examples, "I->" and "T->" show iSCSI PDUs sent by the initiator + and target respectively. + + The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", + "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this + document are to be interpreted as described in BCP 14 [RFC2119]. + + iSCSI messages - PDUs - are represented by diagrams as in the + following example: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0| Basic Header Segment (BHS) | + +---------------+---------------+---------------+---------------+ + ---------- + +| | + +---------------+---------------+---------------+---------------+ + + The diagrams include byte and bit numbering. + + The following representation and ordering rules are observed in this + document: + + - Word Rule + - Half-word Rule + - Byte Rule + +2.3.1. Word Rule + + A word holds four consecutive bytes. Whenever a word has numeric + content, it is considered an unsigned number in base 2 positional + representation with the lowest numbered byte (e.g., byte 0) bit 0 + representing 2**31 and bit 1 representing 2**30 through lowest + numbered byte + 3 (e.g., byte 3) bit 7 representing 2**0. + + Decimal and hexadecimal representation of word values map this + representation to decimal or hexadecimal positional notation. + + + +Satran, et al. Standards Track [Page 16] + +RFC 3720 iSCSI April 2004 + + +2.3.2. Half-Word Rule + + A half-word holds two consecutive bytes. Whenever a half-word has + numeric content it is considered an unsigned number in base 2 + positional representation with the lowest numbered byte (e.g., byte + 0), bit 0 representing 2**15 and bit 1 representing 2**14 through + lowest numbered byte + 1 (e.g., byte 1), bit 7 representing 2**0. + + Decimal and hexadecimal representation of half-word values map this + representation to decimal or hexadecimal positional notation. + +2.3.3. Byte Rule + + For every PDU, bytes are sent and received in increasing numbered + order (network order). + + Whenever a byte has numerical content, it is considered an unsigned + number in base 2 positional representation with bit 0 representing + 2**7 and bit 1 representing 2**6 through bit 7 representing 2**0. + +3. Overview + +3.1. SCSI Concepts + + The SCSI Architecture Model-2 [SAM2] describes in detail the + architecture of the SCSI family of I/O protocols. This section + provides a brief background of the SCSI architecture and is intended + to familiarize readers with its terminology. + + At the highest level, SCSI is a family of interfaces for requesting + services from I/O devices, including hard drives, tape drives, CD and + DVD drives, printers, and scanners. In SCSI terminology, an + individual I/O device is called a "logical unit" (LU). + + SCSI is a client-server architecture. Clients of a SCSI interface + are called "initiators". Initiators issue SCSI "commands" to request + services from components, logical units, of a server known as a + "target". The "device server" on the logical unit accepts SCSI + commands and processes them. + + A "SCSI transport" maps the client-server SCSI protocol to a specific + interconnect. Initiators are one endpoint of a SCSI transport. The + "target" is the other endpoint. A target can contain multiple + Logical Units (LUs). Each Logical Unit has an address within a + target called a Logical Unit Number (LUN). + + A SCSI task is a SCSI command or possibly a linked set of SCSI + commands. Some LUs support multiple pending (queued) tasks, but the + + + +Satran, et al. Standards Track [Page 17] + +RFC 3720 iSCSI April 2004 + + + queue of tasks is managed by the logical unit. The target uses an + initiator provided "task tag" to distinguish between tasks. Only one + command in a task can be outstanding at any given time. + + Each SCSI command results in an optional data phase and a required + response phase. In the data phase, information can travel from the + initiator to target (e.g., WRITE), target to initiator (e.g., READ), + or in both directions. In the response phase, the target returns the + final status of the operation, including any errors. + + Command Descriptor Blocks (CDB) are the data structures used to + contain the command parameters that an initiator sends to a target. + The CDB content and structure is defined by [SAM2] and device-type + specific SCSI standards. + +3.2. iSCSI Concepts and Functional Overview + + The iSCSI protocol is a mapping of the SCSI remote procedure + invocation model (see [SAM2]) over the TCP protocol. SCSI commands + are carried by iSCSI requests and SCSI responses and status are + carried by iSCSI responses. iSCSI also uses the request response + mechanism for iSCSI protocol mechanisms. + + For the remainder of this document, the terms "initiator" and + "target" refer to "iSCSI initiator node" and "iSCSI target node", + respectively (see Section 3.4.1 iSCSI Architecture Model) unless + otherwise qualified. + + In keeping with similar protocols, the initiator and target divide + their communications into messages. This document uses the term + "iSCSI protocol data unit" (iSCSI PDU) for these messages. + + For performance reasons, iSCSI allows a "phase-collapse". A command + and its associated data may be shipped together from initiator to + target, and data and responses may be shipped together from targets. + + The iSCSI transfer direction is defined with respect to the + initiator. Outbound or outgoing transfers are transfers from an + initiator to a target, while inbound or incoming transfers are from a + target to an initiator. + + An iSCSI task is an iSCSI request for which a response is expected. + + In this document "iSCSI request", "iSCSI command", request, or + (unqualified) command have the same meaning. Also, unless otherwise + specified, status, response, or numbered response have the same + meaning. + + + + +Satran, et al. Standards Track [Page 18] + +RFC 3720 iSCSI April 2004 + + +3.2.1. Layers and Sessions + + The following conceptual layering model is used to specify initiator + and target actions and the way in which they relate to transmitted + and received Protocol Data Units: + + a) the SCSI layer builds/receives SCSI CDBs (Command Descriptor + Blocks) and passes/receives them with the remaining command + execute parameters ([SAM2]) to/from + + b) the iSCSI layer that builds/receives iSCSI PDUs and + relays/receives them to/from one or more TCP connections; the + group of connections form an initiator-target "session". + + Communication between the initiator and target occurs over one or + more TCP connections. The TCP connections carry control messages, + SCSI commands, parameters, and data within iSCSI Protocol Data Units + (iSCSI PDUs). The group of TCP connections that link an initiator + with a target form a session (loosely equivalent to a SCSI I_T nexus, + see Section 3.4.2 SCSI Architecture Model). A session is defined by + a session ID that is composed of an initiator part and a target part. + TCP connections can be added and removed from a session. Each + connection within a session is identified by a connection ID (CID). + + Across all connections within a session, an initiator sees one + "target image". All target identifying elements, such as LUN, are + the same. A target also sees one "initiator image" across all + connections within a session. Initiator identifying elements, such + as the Initiator Task Tag, are global across the session regardless + of the connection on which they are sent or received. + + iSCSI targets and initiators MUST support at least one TCP connection + and MAY support several connections in a session. For error recovery + purposes, targets and initiators that support a single active + connection in a session SHOULD support two connections during + recovery. + +3.2.2. Ordering and iSCSI Numbering + + iSCSI uses Command and Status numbering schemes and a Data sequencing + scheme. + + Command numbering is session-wide and is used for ordered command + delivery over multiple connections. It can also be used as a + mechanism for command flow control over a session. + + + + + + +Satran, et al. Standards Track [Page 19] + +RFC 3720 iSCSI April 2004 + + + Status numbering is per connection and is used to enable missing + status detection and recovery in the presence of transient or + permanent communication errors. + + Data sequencing is per command or part of a command (R2T triggered + sequence) and is used to detect missing data and/or R2T PDUs due to + header digest errors. + + Typically, fields in the iSCSI PDUs communicate the Sequence Numbers + between the initiator and target. During periods when traffic on a + connection is unidirectional, iSCSI NOP-Out/In PDUs may be utilized + to synchronize the command and status ordering counters of the target + and initiator. + + The iSCSI session abstraction is equivalent to the SCSI I_T nexus, + and the iSCSI session provides an ordered command delivery from the + SCSI initiator to the SCSI target. For detailed design + considerations that led to the iSCSI session model as it is defined + here and how it relates the SCSI command ordering features defined in + SCSI specifications to the iSCSI concepts see [CORD]. + +3.2.2.1. Command Numbering and Acknowledging + + iSCSI performs ordered command delivery within a session. All + commands (initiator-to-target PDUs) in transit from the initiator to + the target are numbered. + + iSCSI considers a task to be instantiated on the target in response + to every request issued by the initiator. A set of task management + operations including abort and reassign (see Section 10.5 Task + Management Function Request) may be performed on any iSCSI task. + + Some iSCSI tasks are SCSI tasks, and many SCSI activities are related + to a SCSI task ([SAM2]). In all cases, the task is identified by the + Initiator Task Tag for the life of the task. + + The command number is carried by the iSCSI PDU as CmdSN + (Command Sequence Number). The numbering is session-wide. Outgoing + iSCSI PDUs carry this number. The iSCSI initiator allocates CmdSNs + with a 32-bit unsigned counter (modulo 2**32). Comparisons and + arithmetic on CmdSN use Serial Number Arithmetic as defined in + [RFC1982] where SERIAL_BITS = 32. + + Commands meant for immediate delivery are marked with an immediate + delivery flag; they MUST also carry the current CmdSN. CmdSN does + not advance after a command marked for immediate delivery is sent. + + + + + +Satran, et al. Standards Track [Page 20] + +RFC 3720 iSCSI April 2004 + + + Command numbering starts with the first login request on the first + connection of a session (the leading login on the leading connection) + and command numbers are incremented by 1 for every non-immediate + command issued afterwards. + + If immediate delivery is used with task management commands, these + commands may reach the target before the tasks on which they are + supposed to act. However their CmdSN serves as a marker of their + position in the stream of commands. The initiator and target must + ensure that the task management commands act as specified by [SAM2]. + For example, both commands and responses appear as if delivered in + order. Whenever CmdSN for an outgoing PDU is not specified by an + explicit rule, CmdSN will carry the current value of the local CmdSN + variable (see later in this section). + + The means by which an implementation decides to mark a PDU for + immediate delivery or by which iSCSI decides by itself to mark a PDU + for immediate delivery are beyond the scope of this document. + + The number of commands used for immediate delivery is not limited and + their delivery for execution is not acknowledged through the + numbering scheme. Immediate commands MAY be rejected by the iSCSI + target layer due to a lack of resources. An iSCSI target MUST be + able to handle at least one immediate task management command and one + immediate non-task-management iSCSI command per connection at any + time. + + In this document, delivery for execution means delivery to the SCSI + execution engine or an iSCSI protocol specific execution engine + (e.g., for text requests with public or private extension keys + involving an execution component). With the exception of the + commands marked for immediate delivery, the iSCSI target layer MUST + deliver the commands for execution in the order specified by CmdSN. + Commands marked for immediate delivery may be delivered by the iSCSI + target layer for execution as soon as detected. iSCSI may avoid + delivering some commands to the SCSI target layer if required by a + prior SCSI or iSCSI action (e.g., CLEAR TASK SET Task Management + request received before all the commands on which it was supposed to + act). + + On any connection, the iSCSI initiator MUST send the commands in + increasing order of CmdSN, except for commands that are retransmitted + due to digest error recovery and connection recovery. + + For the numbering mechanism, the initiator and target maintain the + following three variables for each session: + + + + + +Satran, et al. Standards Track [Page 21] + +RFC 3720 iSCSI April 2004 + + + - CmdSN - the current command Sequence Number, advanced by 1 on + each command shipped except for commands marked for immediate + delivery. CmdSN always contains the number to be assigned to + the next Command PDU. + - ExpCmdSN - the next expected command by the target. The target + acknowledges all commands up to, but not including, this + number. The initiator treats all commands with CmdSN less than + ExpCmdSN as acknowledged. The target iSCSI layer sets the + ExpCmdSN to the largest non-immediate CmdSN that it can deliver + for execution plus 1 (no holes in the CmdSN sequence). + - MaxCmdSN - the maximum number to be shipped. The queuing + capacity of the receiving iSCSI layer is MaxCmdSN - ExpCmdSN + + 1. + + The initiator's ExpCmdSN and MaxCmdSN are derived from + target-to-initiator PDU fields. Comparisons and arithmetic on + ExpCmdSN and MaxCmdSN MUST use Serial Number Arithmetic as defined in + [RFC1982] where SERIAL_BITS = 32. + + The target MUST NOT transmit a MaxCmdSN that is less than + ExpCmdSN-1. For non-immediate commands, the CmdSN field can take any + value from ExpCmdSN to MaxCmdSN inclusive. The target MUST silently + ignore any non-immediate command outside of this range or non- + immediate duplicates within the range. The CmdSN carried by + immediate commands may lie outside the ExpCmdSN to MaxCmdSN range. + For example, if the initiator has previously sent a non-immediate + command carrying the CmdSN equal to MaxCmdSN, the target window is + closed. For group task management commands issued as immediate + commands, CmdSN indicates the scope of the group action (e.g., on + ABORT TASK SET indicates which commands are aborted). + + MaxCmdSN and ExpCmdSN fields are processed by the initiator as + follows: + + - If the PDU MaxCmdSN is less than the PDU ExpCmdSN-1 (in Serial + Arithmetic Sense), they are both ignored. + - If the PDU MaxCmdSN is greater than the local MaxCmdSN (in + Serial Arithmetic Sense), it updates the local MaxCmdSN; + otherwise, it is ignored. + - If the PDU ExpCmdSN is greater than the local ExpCmdSN (in + Serial Arithmetic Sense), it updates the local ExpCmdSN; + otherwise, it is ignored. + + This sequence is required because updates may arrive out of order + (e.g., the updates are sent on different TCP connections). + + iSCSI initiators and targets MUST support the command numbering + scheme. + + + +Satran, et al. Standards Track [Page 22] + +RFC 3720 iSCSI April 2004 + + + A numbered iSCSI request will not change its allocated CmdSN, + regardless of the number of times and circumstances in which it is + reissued (see Section 6.2.1 Usage of Retry). At the target, CmdSN is + only relevant when the command has not created any state related to + its execution (execution state); afterwards, CmdSN becomes + irrelevant. Testing for the execution state (represented by + identifying the Initiator Task Tag) MUST precede any other action at + the target. If no execution state is found, it is followed by + ordering and delivery. If an execution state is found, it is + followed by delivery. + + If an initiator issues a command retry for a command with CmdSN R on + a connection when the session CmdSN value is Q, it MUST NOT advance + the CmdSN past R + 2**31 -1 unless the connection is no longer + operational (i.e., it has returned to the FREE state, see Section + 7.1.3 Standard Connection State Diagram for an Initiator), the + connection has been reinstated (see Section 5.3.4 Connection + Reinstatement), or a non-immediate command with CmdSN equal or + greater than Q was issued subsequent to the command retry on the same + connection and the reception of that command is acknowledged by the + target (see Section 9.4 Command Retry and Cleaning Old Command + Instances). + + A target MUST NOT issue a command response or Data-In PDU with status + before acknowledging the command. However, the acknowledgement can + be included in the response or Data-In PDU. + +3.2.2.2. Response/Status Numbering and Acknowledging + + Responses in transit from the target to the initiator are numbered. + The StatSN (Status Sequence Number) is used for this purpose. StatSN + is a counter maintained per connection. ExpStatSN is used by the + initiator to acknowledge status. The status sequence number space is + 32-bit unsigned-integers and the arithmetic operations are the + regular mod(2**32) arithmetic. + + Status numbering starts with the Login response to the first Login + request of the connection. The Login response includes an initial + value for status numbering (any initial value is valid). + + To enable command recovery, the target MAY maintain enough state + information for data and status recovery after a connection failure. + A target doing so can safely discard all of the state information + maintained for recovery of a command after the delivery of the status + for the command (numbered StatSN) is acknowledged through ExpStatSN. + + A large absolute difference between StatSN and ExpStatSN may indicate + a failed connection. Initiators MUST undertake recovery actions if + + + +Satran, et al. Standards Track [Page 23] + +RFC 3720 iSCSI April 2004 + + + the difference is greater than an implementation defined constant + that MUST NOT exceed 2**31-1. + + Initiators and Targets MUST support the response-numbering scheme. + +3.2.2.3. Data Sequencing + + Data and R2T PDUs transferred as part of some command execution MUST + be sequenced. The DataSN field is used for data sequencing. For + input (read) data PDUs, DataSN starts with 0 for the first data PDU + of an input command and advances by 1 for each subsequent data PDU. + For output data PDUs, DataSN starts with 0 for the first data PDU of + a sequence (the initial unsolicited sequence or any data PDU sequence + issued to satisfy an R2T) and advances by 1 for each subsequent data + PDU. R2Ts are also sequenced per command. For example, the first + R2T has an R2TSN of 0 and advances by 1 for each subsequent R2T. For + bidirectional commands, the target uses the DataSN/R2TSN to sequence + Data-In and R2T PDUs in one continuous sequence (undifferentiated). + Unlike command and status, data PDUs and R2Ts are not acknowledged by + a field in regular outgoing PDUs. Data-In PDUs can be acknowledged + on demand by a special form of the SNACK PDU. Data and R2T PDUs are + implicitly acknowledged by status for the command. The DataSN/R2TSN + field enables the initiator to detect missing data or R2T PDUs. + + For any read or bidirectional command, a target MUST issue less than + 2**32 combined R2T and Data-In PDUs. Any output data sequence MUST + contain less than 2**32 Data-Out PDUs. + +3.2.3. iSCSI Login + + The purpose of the iSCSI login is to enable a TCP connection for + iSCSI use, authentication of the parties, negotiation of the + session's parameters and marking of the connection as belonging to an + iSCSI session. + + A session is used to identify to a target all the connections with a + given initiator that belong to the same I_T nexus. (For more details + on how a session relates to an I_T nexus, see Section 3.4.2 SCSI + Architecture Model). + + The targets listen on a well-known TCP port or other TCP port for + incoming connections. The initiator begins the login process by + connecting to one of these TCP ports. + + As part of the login process, the initiator and target SHOULD + authenticate each other and MAY set a security association protocol + for the session. This can occur in many different ways and is + subject to negotiation. + + + +Satran, et al. Standards Track [Page 24] + +RFC 3720 iSCSI April 2004 + + + To protect the TCP connection, an IPsec security association MAY be + established before the Login request. For information on using IPsec + security for iSCSI see Chapter 8 and [RFC3723]. + + The iSCSI Login Phase is carried through Login requests and + responses. Once suitable authentication has occurred and operational + parameters have been set, the session transitions to the Full Feature + Phase and the initiator may start to send SCSI commands. The + security policy for whether, and by what means, a target chooses to + authorize an initiator is beyond the scope of this document. For a + more detailed description of the Login Phase, see Chapter 5. + + The login PDU includes the ISID part of the session ID (SSID). The + target portal group that services the login is implied by the + selection of the connection endpoint. For a new session, the TSIH is + zero. As part of the response, the target generates a TSIH. + + During session establishment, the target identifies the SCSI + initiator port (the "I" in the "I_T nexus") through the value pair + (InitiatorName, ISID). We describe InitiatorName later in this + section. Any persistent state (e.g., persistent reservations) on the + target that is associated with a SCSI initiator port is identified + based on this value pair. Any state associated with the SCSI target + port (the "T" in the "I_T nexus") is identified externally by the + TargetName and portal group tag (see Section 3.4.1 iSCSI Architecture + Model). ISID is subject to reuse restrictions because it is used to + identify a persistent state (see Section 3.4.3 Consequences of the + Model). + + Before the Full Feature Phase is established, only Login Request and + Login Response PDUs are allowed. Login requests and responses MUST + be used exclusively during Login. On any connection, the login phase + MUST immediately follow TCP connection establishment and a subsequent + Login Phase MUST NOT occur before tearing down a connection. + + A target receiving any PDU except a Login request before the Login + phase is started MUST immediately terminate the connection on which + the PDU was received. Once the Login phase has started, if the + target receives any PDU except a Login request, it MUST send a Login + reject (with Status "invalid during login") and then disconnect. If + the initiator receives any PDU except a Login response, it MUST + immediately terminate the connection. + +3.2.4. iSCSI Full Feature Phase + + Once the initiator is authorized to do so, the iSCSI session is in + the iSCSI Full Feature Phase. A session is in Full Feature Phase + after successfully finishing the Login Phase on the first (leading) + + + +Satran, et al. Standards Track [Page 25] + +RFC 3720 iSCSI April 2004 + + + connection of a session. A connection is in Full Feature Phase if + the session is in Full Feature Phase and the connection login has + completed successfully. An iSCSI connection is not in Full Feature + Phase + + a) when it does not have an established transport connection, + + OR + + b) when it has a valid transport connection, but a successful + login was not performed or the connection is currently logged + out. + + In a normal Full Feature Phase, the initiator may send SCSI commands + and data to the various LUs on the target by encapsulating them in + iSCSI PDUs that go over the established iSCSI session. + +3.2.4.1. Command Connection Allegiance + + For any iSCSI request issued over a TCP connection, the corresponding + response and/or other related PDU(s) MUST be sent over the same + connection. We call this "connection allegiance". If the original + connection fails before the command is completed, the connection + allegiance of the command may be explicitly reassigned to a different + transport connection as described in detail in Section 6.2 Retry and + Reassign in Recovery. + + Thus, if an initiator issues a READ command, the target MUST send the + requested data, if any, followed by the status to the initiator over + the same TCP connection that was used to deliver the SCSI command. + If an initiator issues a WRITE command, the initiator MUST send the + data, if any, for that command over the same TCP connection that was + used to deliver the SCSI command. The target MUST return Ready To + Transfer (R2T), if any, and the status over the same TCP connection + that was used to deliver the SCSI command. Retransmission requests + (SNACK PDUs) and the data and status that they generate MUST also use + the same connection. + + However, consecutive commands that are part of a SCSI linked + command-chain task (see [SAM2]) MAY use different connections. + Connection allegiance is strictly per-command and not per-task. + During the iSCSI Full Feature Phase, the initiator and target MAY + interleave unrelated SCSI commands, their SCSI Data, and responses + over the session. + + + + + + + +Satran, et al. Standards Track [Page 26] + +RFC 3720 iSCSI April 2004 + + +3.2.4.2. Data Transfer Overview + + Outgoing SCSI data (initiator to target user data or command + parameters) is sent as either solicited data or unsolicited data. + Solicited data are sent in response to R2T PDUs. Unsolicited data + can be sent as part of an iSCSI command PDU ("immediate data") or in + separate iSCSI data PDUs. + + Immediate data are assumed to originate at offset 0 in the initiator + SCSI write-buffer (outgoing data buffer). All other Data PDUs have + the buffer offset set explicitly in the PDU header. + + An initiator may send unsolicited data up to FirstBurstLength as + immediate (up to the negotiated maximum PDU length), in a separate + PDU sequence or both. All subsequent data MUST be solicited. The + maximum length of an individual data PDU or the immediate-part of the + first unsolicited burst MAY be negotiated at login. + + The maximum amount of unsolicited data that can be sent with a + command is negotiated at login through the FirstBurstLength key. A + target MAY separately enable immediate data (through the + ImmediateData key) without enabling the more general (separate data + PDUs) form of unsolicited data (through the InitialR2T key). + + Unsolicited data on write are meant to reduce the effect of latency + on throughput (no R2T is needed to start sending data). In addition, + immediate data is meant to reduce the protocol overhead (both + bandwidth and execution time). + + An iSCSI initiator MAY choose not to send unsolicited data, only + immediate data or FirstBurstLength bytes of unsolicited data with a + command. If any non-immediate unsolicited data is sent, the total + unsolicited data MUST be either FirstBurstLength, or all of the data + if the total amount is less than the FirstBurstLength. + + It is considered an error for an initiator to send unsolicited data + PDUs to a target that operates in R2T mode (only solicited data are + allowed). It is also an error for an initiator to send more + unsolicited data, whether immediate or as separate PDUs, than + FirstBurstLength. + + An initiator MUST honor an R2T data request for a valid outstanding + command (i.e., carrying a valid Initiator Task Tag) and deliver all + the requested data provided the command is supposed to deliver + outgoing data and the R2T specifies data within the command bounds. + The initiator action is unspecified for receiving an R2T request that + specifies data, all or part, outside of the bounds of the command. + + + + +Satran, et al. Standards Track [Page 27] + +RFC 3720 iSCSI April 2004 + + + A target SHOULD NOT silently discard data and then request + retransmission through R2T. Initiators SHOULD NOT keep track of the + data transferred to or from the target (scoreboarding). SCSI targets + perform residual count calculation to check how much data was + actually transferred to or from the device by a command. This may + differ from the amount the initiator sent and/or received for reasons + such as retransmissions and errors. Read or bidirectional commands + implicitly solicit the transmission of the entire amount of data + covered by the command. SCSI data packets are matched to their + corresponding SCSI commands by using tags specified in the protocol. + + In addition, iSCSI initiators and targets MUST enforce some ordering + rules. When unsolicited data is used, the order of the unsolicited + data on each connection MUST match the order in which the commands on + that connection are sent. Command and unsolicited data PDUs may be + interleaved on a single connection as long as the ordering + requirements of each are maintained (e.g., command N+1 MAY be sent + before the unsolicited Data-Out PDUs for command N, but the + unsolicited Data-Out PDUs for command N MUST precede the unsolicited + Data-Out PDUs of command N+1). A target that receives data out of + order MAY terminate the session. + +3.2.4.3. Tags and Integrity Checks + + Initiator tags for pending commands are unique initiator-wide for a + session. Target tags are not strictly specified by the protocol. It + is assumed that target tags are used by the target to tag (alone or + in combination with the LUN) the solicited data. Target tags are + generated by the target and "echoed" by the initiator. These + mechanisms are designed to accomplish efficient data delivery along + with a large degree of control over the data flow. + + As the Initiator Task Tag is used to identify a task during its + execution, the iSCSI initiator and target MUST verify that all other + fields used in task-related PDUs have values that are consistent with + the values used at the task instantiation based on the Initiator Task + Tag (e.g., the LUN used in an R2T PDU MUST be the same as the one + used in the SCSI command PDU used to instantiate the task). Using + inconsistent field values is considered a protocol error. + +3.2.4.4. Task Management + + SCSI task management assumes that individual tasks and task groups + can be aborted solely based on the task tags (for individual tasks) + or the timing of the task management command (for task groups), and + that the task management action is executed synchronously - i.e., no + message involving an aborted task will be seen by the SCSI initiator + after receiving the task management response. In iSCSI initiators + + + +Satran, et al. Standards Track [Page 28] + +RFC 3720 iSCSI April 2004 + + + and targets interact asynchronously over several connections. iSCSI + specifies the protocol mechanism and implementation requirements + needed to present a synchronous view while using an asynchronous + infrastructure. + +3.2.5. iSCSI Connection Termination + + An iSCSI connection may be terminated by use of a transport + connection shutdown or a transport reset. Transport reset is assumed + to be an exceptional event. + + Graceful TCP connection shutdowns are done by sending TCP FINs. A + graceful transport connection shutdown SHOULD only be initiated by + either party when the connection is not in iSCSI Full Feature Phase. + A target MAY terminate a Full Feature Phase connection on internal + exception events, but it SHOULD announce the fact through an + Asynchronous Message PDU. Connection termination with outstanding + commands may require recovery actions. + + If a connection is terminated while in Full Feature Phase, connection + cleanup (see section 7) is required prior to recovery. By doing + connection cleanup before starting recovery, the initiator and target + will avoid receiving stale PDUs after recovery. + +3.2.6. iSCSI Names + + Both targets and initiators require names for the purpose of + identification. In addition, names enable iSCSI storage resources to + be managed regardless of location (address). An iSCSI node name is + also the SCSI device name of an iSCSI device. The iSCSI name of a + SCSI device is the principal object used in authentication of targets + to initiators and initiators to targets. This name is also used to + identify and manage iSCSI storage resources. + + iSCSI names must be unique within the operational domain of the end + user. However, because the operational domain of an IP network is + potentially worldwide, the iSCSI name formats are architected to be + worldwide unique. To assist naming authorities in the construction + of worldwide unique names, iSCSI provides two name formats for + different types of naming authorities. + + iSCSI names are associated with iSCSI nodes, and not iSCSI network + adapter cards, to ensure that the replacement of network adapter + cards does not require reconfiguration of all SCSI and iSCSI resource + allocation information. + + + + + + +Satran, et al. Standards Track [Page 29] + +RFC 3720 iSCSI April 2004 + + + Some SCSI commands require that protocol-specific identifiers be + communicated within SCSI CDBs. See Section 3.4.2 SCSI Architecture + Model for the definition of the SCSI port name/identifier for iSCSI + ports. + + An initiator may discover the iSCSI Target Names to which it has + access, along with their addresses, using the SendTargets text + request, or other techniques discussed in [RFC3721]. + +3.2.6.1. iSCSI Name Properties + + Each iSCSI node, whether an initiator or target, MUST have an iSCSI + name. + + Initiators and targets MUST support the receipt of iSCSI names of up + to the maximum length of 223 bytes. + + The initiator MUST present both its iSCSI Initiator Name and the + iSCSI Target Name to which it wishes to connect in the first login + request of a new session or connection. The only exception is if a + discovery session (see Section 2.3 iSCSI Session Types) is to be + established. In this case, the iSCSI Initiator Name is still + required, but the iSCSI Target Name MAY be omitted. + + iSCSI names have the following properties: + + a) iSCSI names are globally unique. No two initiators or targets + can have the same name. + b) iSCSI names are permanent. An iSCSI initiator node or target + node has the same name for its lifetime. + c) iSCSI names do not imply a location or address. An iSCSI + initiator or target can move, or have multiple addresses. A + change of address does not imply a change of name. + d) iSCSI names do not rely on a central name broker; the naming + authority is distributed. + e) iSCSI names support integration with existing unique naming + schemes. + f) iSCSI names rely on existing naming authorities. iSCSI does + not create any new naming authority. + + The encoding of an iSCSI name has the following properties: + + a) iSCSI names have the same encoding method regardless of the + underlying protocols. + b) iSCSI names are relatively simple to compare. The algorithm + for comparing two iSCSI names for equivalence does not rely on + an external server. + + + + +Satran, et al. Standards Track [Page 30] + +RFC 3720 iSCSI April 2004 + + + c) iSCSI names are composed only of displayable characters. iSCSI + names allow the use of international character sets but are not + case sensitive. No whitespace characters are used in iSCSI + names. + d) iSCSI names may be transported using both binary and + ASCII-based protocols. + + An iSCSI name really names a logical software entity, and is not tied + to a port or other hardware that can be changed. For instance, an + initiator name should name the iSCSI initiator node, not a particular + NIC or HBA. When multiple NICs are used, they should generally all + present the same iSCSI initiator name to the targets, because they + are simply paths to the same SCSI layer. In most operating systems, + the named entity is the operating system image. + + Similarly, a target name should not be tied to hardware interfaces + that can be changed. A target name should identify the logical + target and must be the same for the target regardless of the physical + portion being addressed. This assists iSCSI initiators in + determining that the two targets it has discovered are really two + paths to the same target. + + The iSCSI name is designed to fulfill the functional requirements for + Uniform Resource Names (URN) [RFC1737]. For example, it is required + that the name have a global scope, be independent of address or + location, and be persistent and globally unique. Names must be + extensible and scalable with the use of naming authorities. The name + encoding should be both human and machine readable. See [RFC1737] + for further requirements. + +3.2.6.2. iSCSI Name Encoding + + An iSCSI name MUST be a UTF-8 encoding of a string of Unicode + characters with the following properties: + + - It is in Normalization Form C (see "Unicode Normalization + Forms" [UNICODE]). + - It only contains characters allowed by the output of the iSCSI + stringprep template (described in [RFC3722]). + - The following characters are used for formatting iSCSI names: + + - dash ('-'=U+002d) + - dot ('.'=U+002e) + - colon (':'=U+003a) + + - The UTF-8 encoding of the name is not larger than 223 bytes. + + + + + +Satran, et al. Standards Track [Page 31] + +RFC 3720 iSCSI April 2004 + + + The stringprep process is described in [RFC3454]; iSCSI's use of the + stringprep process is described in [RFC3722]. Stringprep is a method + designed by the Internationalized Domain Name (IDN) working group to + translate human-typed strings into a format that can be compared as + opaque strings. Strings MUST NOT include punctuation, spacing, + diacritical marks, or other characters that could get in the way of + readability. The stringprep process also converts strings into + equivalent strings of lower-case characters. + + The stringprep process does not need to be implemented if the names + are only generated using numeric and lower-case (any character set) + alphabetic characters. + + Once iSCSI names encoded in UTF-8 are "normalized" they may be safely + compared byte-for-byte. + +3.2.6.3. iSCSI Name Structure + + An iSCSI name consists of two parts--a type designator followed by a + unique name string. + + The iSCSI name does not define any new naming authorities. Instead, + it supports two existing ways of designating naming authorities: an + iSCSI-Qualified Name, using domain names to identify a naming + authority, and the EUI format, where the IEEE Registration Authority + assists in the formation of worldwide unique names (EUI-64 format). + + The type designator strings currently defined are: + + iqn. - iSCSI Qualified name + eui. - Remainder of the string is an IEEE EUI-64 + identifier, in ASCII-encoded hexadecimal. + + These two naming authority designators were considered sufficient at + the time of writing this document. The creation of additional naming + type designators for iSCSI may be considered by the IETF and detailed + in separate RFCs. + +3.2.6.3.1. Type "iqn." (iSCSI Qualified Name) + + This iSCSI name type can be used by any organization that owns a + domain name. This naming format is useful when an end user or + service provider wishes to assign iSCSI names for targets and/or + initiators. + + To generate names of this type, the person or organization generating + the name must own a registered domain name. This domain name does + not have to be active, and does not have to resolve to an address; it + + + +Satran, et al. Standards Track [Page 32] + +RFC 3720 iSCSI April 2004 + + + just needs to be reserved to prevent others from generating iSCSI + names using the same domain name. + + Since a domain name can expire, be acquired by another entity, or may + be used to generate iSCSI names by both owners, the domain name must + be additionally qualified by a date during which the naming authority + owned the domain name. For this reason, a date code is provided as + part of the "iqn." format. + + The iSCSI qualified name string consists of: + + - The string "iqn.", used to distinguish these names from "eui." + formatted names. + - A date code, in yyyy-mm format. This date MUST be a date + during which the naming authority owned the domain name used in + this format, and SHOULD be the first month in which the domain + name was owned by this naming authority at 00:01 GMT of the + first day of the month. This date code uses the Gregorian + calendar. All four digits in the year must be present. Both + digits of the month must be present, with January == "01" and + December == "12". The dash must be included. + - A dot "." + - The reversed domain name of the naming authority (person or + organization) creating this iSCSI name. + - An optional, colon (:) prefixed, string within the character + set and length boundaries that the owner of the domain name + deems appropriate. This may contain product types, serial + numbers, host identifiers, or software keys (e.g., it may + include colons to separate organization boundaries). With the + exception of the colon prefix, the owner of the domain name can + assign everything after the reversed domain name as desired. + It is the responsibility of the entity that is the naming + authority to ensure that the iSCSI names it assigns are + worldwide unique. For example, "Example Storage Arrays, Inc.", + might own the domain name "example.com". + + The following are examples of iSCSI qualified names that might be + generated by "EXAMPLE Storage Arrays, Inc." + + Naming String defined by + Type Date Auth "example.com" naming authority + +--++-----+ +---------+ +--------------------------------+ + | || | | | | | + + iqn.2001-04.com.example:storage:diskarrays-sn-a8675309 + iqn.2001-04.com.example + iqn.2001-04.com.example:storage.tape1.sys1.xyz + iqn.2001-04.com.example:storage.disk2.sys1.xyz + + + +Satran, et al. Standards Track [Page 33] + +RFC 3720 iSCSI April 2004 + + + +3.2.6.3.2. Type "eui." (IEEE EUI-64 format) + + The IEEE Registration Authority provides a service for assigning + globally unique identifiers [EUI]. The EUI-64 format is used to + build a global identifier in other network protocols. For example, + Fibre Channel defines a method of encoding it into a WorldWideName. + For more information on registering for EUI identifiers, see [OUI]. + + The format is "eui." followed by an EUI-64 identifier (16 + ASCII-encoded hexadecimal digits). + + Example iSCSI name: + + Type EUI-64 identifier (ASCII-encoded hexadecimal) + +--++--------------+ + | || | + eui.02004567A425678D + + The IEEE EUI-64 iSCSI name format might be used when a manufacturer + is already registered with the IEEE Registration Authority and uses + EUI-64 formatted worldwide unique names for its products. + + More examples of name construction are discussed in [RFC3721]. + +3.2.7. Persistent State + + iSCSI does not require any persistent state maintenance across + sessions. However, in some cases, SCSI requires persistent + identification of the SCSI initiator port name (See Section 3.4.2 + SCSI Architecture Model and Section 3.4.3 Consequences of the Model). + + iSCSI sessions do not persist through power cycles and boot + operations. + + All iSCSI session and connection parameters are re-initialized upon + session and connection creation. + + Commands persist beyond connection termination if the session + persists and command recovery within the session is supported. + However, when a connection is dropped, command execution, as + perceived by iSCSI (i.e., involving iSCSI protocol exchanges for the + affected task), is suspended until a new allegiance is established by + the 'task reassign' task management function. (See Section 10.5 Task + Management Function Request.) + + + + + + +Satran, et al. Standards Track [Page 34] + +RFC 3720 iSCSI April 2004 + + +3.2.8. Message Synchronization and Steering + + iSCSI presents a mapping of the SCSI protocol onto TCP. This + encapsulation is accomplished by sending iSCSI PDUs of varying + lengths. Unfortunately, TCP does not have a built-in mechanism for + signaling message boundaries at the TCP layer. iSCSI overcomes this + obstacle by placing the message length in the iSCSI message header. + This serves to delineate the end of the current message as well as + the beginning of the next message. + + In situations where IP packets are delivered in order from the + network, iSCSI message framing is not an issue and messages are + processed one after the other. In the presence of IP packet + reordering (i.e., frames being dropped), legacy TCP implementations + store the "out of order" TCP segments in temporary buffers until the + missing TCP segments arrive, upon which the data must be copied to + the application buffers. In iSCSI, it is desirable to steer the SCSI + data within these out of order TCP segments into the pre-allocated + SCSI buffers rather than store them in temporary buffers. This + decreases the need for dedicated reassembly buffers as well as the + latency and bandwidth related to extra copies. + + Relying solely on the "message length" information from the iSCSI + message header may make it impossible to find iSCSI message + boundaries in subsequent TCP segments due to the loss of a TCP + segment that contains the iSCSI message length. The missing TCP + segment(s) must be received before any of the following segments can + be steered to the correct SCSI buffers (due to the inability to + determine the iSCSI message boundaries). Since these segments cannot + be steered to the correct location, they must be saved in temporary + buffers that must then be copied to the SCSI buffers. + + Different schemes can be used to recover synchronization. To make + these schemes work, iSCSI implementations have to make sure that the + appropriate protocol layers are provided with enough information to + implement a synchronization and/or data steering mechanism. One of + these schemes is detailed in Appendix A. - Sync and Steering with + Fixed Interval Markers -. + + The Fixed Interval Markers (FIM) scheme works by inserting markers in + the payload stream at fixed intervals that contain the offset for the + start of the next iSCSI PDU. + + Under normal circumstances (no PDU loss or data reception out of + order), iSCSI data steering can be accomplished by using the + identifying tag and the data offset fields in the iSCSI header in + addition to the TCP sequence number from the TCP header. The + + + + +Satran, et al. Standards Track [Page 35] + +RFC 3720 iSCSI April 2004 + + + identifying tag helps associate the PDU with a SCSI buffer address + while the data offset and TCP sequence number are used to determine + the offset within the buffer. + + When the part of the TCP data stream containing an iSCSI PDU header + is delayed or lost, markers may be used to minimize the damage as + follows: + + - Markers indicate where the next iSCSI PDU starts and enable + continued processing when iSCSI headers have to be dropped due to + data errors discovered at the iSCSI level (e.g., iSCSI header CRC + errors). + + - Markers help minimize the amount of data that has to be kept by + the TCP/iSCSI layer while waiting for a late TCP packet arrival + or recovery, because later they might help find iSCSI PDU headers + and use the information contained in those to steer data to SCSI + buffers. + +3.2.8.1. Sync/Steering and iSCSI PDU Length + + When a large iSCSI message is sent, the TCP segment(s) that contain + the iSCSI header may be lost. The remaining TCP segment(s), up to + the next iSCSI message, must be buffered (in temporary buffers) + because the iSCSI header that indicates to which SCSI buffers the + data are to be steered was lost. To minimize the amount of + buffering, it is recommended that the iSCSI PDU length be restricted + to a small value (perhaps a few TCP segments in length). During + login, each end of the iSCSI session specifies the maximum iSCSI PDU + length it will accept. + +3.3. iSCSI Session Types + + iSCSI defines two types of sessions: + + a) Normal operational session - an unrestricted session. + b) Discovery-session - a session only opened for target + discovery. The target MUST ONLY accept text requests with the + SendTargets key and a logout request with the reason "close + the session". All other requests MUST be rejected. + + The session type is defined during login with the key=value parameter + in the login command. + + + + + + + + +Satran, et al. Standards Track [Page 36] + +RFC 3720 iSCSI April 2004 + + +3.4. SCSI to iSCSI Concepts Mapping Model + + The following diagram shows an example of how multiple iSCSI Nodes + (targets in this case) can coexist within the same Network Entity and + can share Network Portals (IP addresses and TCP ports). Other more + complex configurations are also possible. For detailed descriptions + of the components of these diagrams, see Section 3.4.1 iSCSI + Architecture Model. + + +-----------------------------------+ + | Network Entity (iSCSI Client) | + | | + | +-------------+ | + | | iSCSI Node | | + | | (Initiator) | | + | +-------------+ | + | | | | + | +--------------+ +--------------+ | + | |Network Portal| |Network Portal| | + | | 10.1.30.4 | | 10.1.40.6 | | + +-+--------------+-+--------------+-+ + | | + | IP Networks | + | | + +-+--------------+-+--------------+-+ + | |Network Portal| |Network Portal| | + | | 10.1.30.21 | | 10.1.40.3 | | + | | TCP Port 3260| | TCP Port 3260| | + | +--------------+ +--------------+ | + | | | | + | ----------------- | + | | | | + | +-------------+ +--------------+ | + | | iSCSI Node | | iSCSI Node | | + | | (Target) | | (Target) | | + | +-------------+ +--------------+ | + | | + | Network Entity (iSCSI Server) | + +-----------------------------------+ + +3.4.1. iSCSI Architecture Model + + This section describes the part of the iSCSI architecture model that + has the most bearing on the relationship between iSCSI and the SCSI + Architecture Model. + + + + + + +Satran, et al. Standards Track [Page 37] + +RFC 3720 iSCSI April 2004 + + + a) Network Entity - represents a device or gateway that is + accessible from the IP network. A Network Entity must have + one or more Network Portals (see item d), each of which can be + used by some iSCSI Nodes (see item (b)) contained in that + Network Entity to gain access to the IP network. + + b) iSCSI Node - represents a single iSCSI initiator or iSCSI + target. There are one or more iSCSI Nodes within a Network + Entity. The iSCSI Node is accessible via one or more Network + Portals (see item d). An iSCSI Node is identified by its + iSCSI Name (see Section 3.2.6 iSCSI Names and Chapter 12). + The separation of the iSCSI Name from the addresses used by + and for the iSCSI node allows multiple iSCSI nodes to use the + same addresses, and the same iSCSI node to use multiple + addresses. + + c) An alias string may also be associated with an iSCSI Node. + The alias allows an organization to associate a user friendly + string with the iSCSI Name. However, the alias string is not + a substitute for the iSCSI Name. + + d) Network Portal - a component of a Network Entity that has a + TCP/IP network address and that may be used by an iSCSI Node + within that Network Entity for the connection(s) within one of + its iSCSI sessions. In an initiator, it is identified by its + IP address. In a target, it is identified by its IP address + and its listening TCP port. + + e) Portal Groups - iSCSI supports multiple connections within the + same session; some implementations will have the ability to + combine connections in a session across multiple Network + Portals. A Portal Group defines a set of Network Portals + within an iSCSI Node that collectively supports the capability + of coordinating a session with connections that span these + portals. Not all Network Portals within a Portal Group need + to participate in every session connected through that Portal + Group. One or more Portal Groups may provide access to an + iSCSI Node. Each Network Portal, as utilized by a given iSCSI + Node, belongs to exactly one portal group within that node. + Portal Groups are identified within an iSCSI Node by a portal + group tag, a simple unsigned-integer between 0 and 65535 (see + Section 12.3 SendTargets). All Network Portals with the same + portal group tag in the context of a given iSCSI Node are in + the same Portal Group. + + + + + + + +Satran, et al. Standards Track [Page 38] + +RFC 3720 iSCSI April 2004 + + + Both iSCSI Initiators and iSCSI Targets have portal groups, + though only the iSCSI Target Portal Groups are used directly + in the iSCSI protocol (e.g., in SendTargets). For references + to the initiator Portal Groups, see Section 9.1.1 Conservative + Reuse of ISIDs. + + f) Portals within a Portal Group should support similar session + parameters, because they may participate in a common session. + + The following diagram shows an example of one such configuration on a + target and how a session that shares Network Portals within a Portal + Group may be established. + + ----------------------------IP Network--------------------- + | | | + +----|---------------|-----+ +----|---------+ + | +---------+ +---------+ | | +---------+ | + | | Network | | Network | | | | Network | | + | | Portal | | Portal | | | | Portal | | + | +--|------+ +---------+ | | +---------+ | + | | | | | | | + | | Portal | | | | Portal | + | | Group 1 | | | | Group 2 | + +--------------------------+ +--------------+ + | | | + +--------|---------------|--------------------|--------------------+ + | | | | | + | +----------------------------+ +-----------------------------+ | + | | iSCSI Session (Target side)| | iSCSI Session (Target side) | | + | | | | | | + | | (TSIH = 56) | | (TSIH = 48) | | + | +----------------------------+ +-----------------------------+ | + | | + | iSCSI Target Node | + | (within Network Entity, not shown) | + +------------------------------------------------------------------+ + +3.4.2. SCSI Architecture Model + + This section describes the relationship between the SCSI Architecture + Model [SAM2] and the constructs of the SCSI device, SCSI port and I_T + nexus, and the iSCSI constructs described in Section 3.4.1 iSCSI + Architecture Model. + + This relationship implies implementation requirements in order to + conform to the SAM2 model and other SCSI operational functions. + These requirements are detailed in Section 3.4.3 Consequences of the + Model. + + + +Satran, et al. Standards Track [Page 39] + +RFC 3720 iSCSI April 2004 + + + The following list outlines mappings of SCSI architectural elements + to iSCSI. + + a) SCSI Device - the SAM2 term for an entity that contains one or + more SCSI ports that are connected to a service delivery + subsystem and supports a SCSI application protocol. For + example, a SCSI Initiator Device contains one or more SCSI + Initiator Ports and zero or more application clients. A SCSI + Target Device contains one or more SCSI Target Ports and one + or more logical units. For iSCSI, the SCSI Device is the + component within an iSCSI Node that provides the SCSI + functionality. As such, there can be one SCSI Device, at + most, within an iSCSI Node. Access to the SCSI Device can + only be achieved in an iSCSI normal operational session (see + Section 3.3 iSCSI Session Types). The SCSI Device Name is + defined to be the iSCSI Name of the node and MUST be used in + the iSCSI protocol. + + b) SCSI Port - the SAM2 term for an entity in a SCSI Device that + provides the SCSI functionality to interface with a service + delivery subsystem or transport. For iSCSI, the definition of + SCSI Initiator Port and SCSI Target Port are different. + + SCSI Initiator Port: This maps to one endpoint of an iSCSI + normal operational session (see Section 3.3 iSCSI Session + Types). An iSCSI normal operational session is negotiated + through the login process between an iSCSI initiator node and + an iSCSI target node. At successful completion of this + process, a SCSI Initiator Port is created within the SCSI + Initiator Device. The SCSI Initiator Port Name and SCSI + Initiator Port Identifier are both defined to be the iSCSI + Initiator Name together with (a) a label that identifies it as + an initiator port name/identifier and (b) the ISID portion of + the session identifier. + + SCSI Target Port: This maps to an iSCSI Target Portal Group. + The SCSI Target Port Name and the SCSI Target Port Identifier + are both defined to be the iSCSI Target Name together with (a) + a label that identifies it as a target port name/identifier + and (b) the portal group tag. + + The SCSI Port Name MUST be used in iSCSI. When used in SCSI + parameter data, the SCSI port name MUST be encoded as: + - The iSCSI Name in UTF-8 format, followed by + - a comma separator (1 byte), followed by + - the ASCII character 'i' (for SCSI Initiator Port) or the + ASCII character 't' (for SCSI Target Port) (1 byte), + followed by + + + +Satran, et al. Standards Track [Page 40] + +RFC 3720 iSCSI April 2004 + + + - a comma separator (1 byte), followed by + - a text encoding as a hex-constant (see Section 5.1 Text + Format) of the ISID (for SCSI initiator port) or the portal + group tag (for SCSI target port) including the initial 0X + or 0x and the terminating null (15 bytes). + + The ASCII character 'i' or 't' is the label that identifies + this port as either a SCSI Initiator Port or a SCSI Target + Port. + + c) I_T nexus - a relationship between a SCSI Initiator Port and a + SCSI Target Port, according to [SAM2]. For iSCSI, this + relationship is a session, defined as a relationship between + an iSCSI Initiator's end of the session (SCSI Initiator Port) + and the iSCSI Target's Portal Group. The I_T nexus can be + identified by the conjunction of the SCSI port names or by the + iSCSI session identifier SSID. iSCSI defines the I_T nexus + identifier to be the tuple (iSCSI Initiator Name + 'i' + ISID, + iSCSI Target Name + 't' + Portal Group Tag). + + NOTE: The I_T nexus identifier is not equal to the session + identifier (SSID). + +3.4.3. Consequences of the Model + + This section describes implementation and behavioral requirements + that result from the mapping of SCSI constructs to the iSCSI + constructs defined above. Between a given SCSI initiator port and a + given SCSI target port, only one I_T nexus (session) can exist. No + more than one nexus relationship (parallel nexus) is allowed by + [SAM2]. Therefore, at any given time, only one session can exist + between a given iSCSI initiator node and an iSCSI target node, with + the same session identifier (SSID). + + These assumptions lead to the following conclusions and requirements: + + ISID RULE: Between a given iSCSI Initiator and iSCSI Target Portal + Group (SCSI target port), there can only be one session with a given + value for ISID that identifies the SCSI initiator port. See Section + 10.12.5 ISID. + + The structure of the ISID that contains a naming authority component + (see Section 10.12.5 ISID and [RFC3721]) provides a mechanism to + facilitate compliance with the ISID rule. (See Section 9.1.1 + Conservative Reuse of ISIDs.) + + + + + + +Satran, et al. Standards Track [Page 41] + +RFC 3720 iSCSI April 2004 + + + The iSCSI Initiator Node should manage the assignment of ISIDs prior + to session initiation. The "ISID RULE" does not preclude the use of + the same ISID from the same iSCSI Initiator with different Target + Portal Groups on the same iSCSI target or on other iSCSI targets (see + Section 9.1.1 Conservative Reuse of ISIDs). Allowing this would be + analogous to a single SCSI Initiator Port having relationships + (nexus) with multiple SCSI target ports on the same SCSI target + device or SCSI target ports on other SCSI target devices. It is also + possible to have multiple sessions with different ISIDs to the same + Target Portal Group. Each such session would be considered to be + with a different initiator even when the sessions originate from the + same initiator device. The same ISID may be used by a different + iSCSI initiator because it is the iSCSI Name together with the ISID + that identifies the SCSI Initiator Port. + + NOTE: A consequence of the ISID RULE and the specification for the + I_T nexus identifier is that two nexus with the same identifier + should never exist at the same time. + + TSIH RULE: The iSCSI Target selects a non-zero value for the TSIH at + session creation (when an initiator presents a 0 value at Login). + After being selected, the same TSIH value MUST be used whenever the + initiator or target refers to the session and a TSIH is required. + +3.4.3.1. I_T Nexus State + + Certain nexus relationships contain an explicit state (e.g., + initiator-specific mode pages) that may need to be preserved by the + device server [SAM2] in a logical unit through changes or failures in + the iSCSI layer (e.g., session failures). In order for that state to + be restored, the iSCSI initiator should reestablish its session + (re-login) to the same Target Portal Group using the previous ISID. + That is, it should perform session recovery as described in Chapter + 6. This is because the SCSI initiator port identifier and the SCSI + target port identifier (or relative target port) form the datum that + the SCSI logical unit device server uses to identify the I_T nexus. + +3.5. Request/Response Summary + + This section lists and briefly describes all the iSCSI PDU types + (request and responses). + + All iSCSI PDUs are built as a set of one or more header segments + (basic and auxiliary) and zero or one data segments. The header + group and the data segment may each be followed by a CRC (digest). + + The basic header segment has a fixed length of 48 bytes. + + + + +Satran, et al. Standards Track [Page 42] + +RFC 3720 iSCSI April 2004 + + +3.5.1. Request/Response Types Carrying SCSI Payload + +3.5.1.1. SCSI-Command + + This request carries the SCSI CDB and all the other SCSI execute + command procedure call (see [SAM2]) IN arguments such as task + attributes, Expected Data Transfer Length for one or both transfer + directions (the latter for bidirectional commands), and Task Tag (as + part of the I_T_L_x nexus). The I_T_L nexus is derived by the + initiator and target from the LUN field in the request and the I_T + nexus is implicit in the session identification. + + In addition, the SCSI-command PDU carries information required for + the proper operation of the iSCSI protocol - the command sequence + number (CmdSN) for the session and the expected status number + (ExpStatSN) for the connection. + + All or part of the SCSI output (write) data associated with the SCSI + command may be sent as part of the SCSI-Command PDU as a data + segment. + +3.5.1.2. SCSI-Response + + The SCSI-Response carries all the SCSI execute-command procedure call + (see [SAM2]) OUT arguments and the SCSI execute-command procedure + call return value. + + The SCSI-Response contains the residual counts from the operation, if + any, an indication of whether the counts represent an overflow or an + underflow, and the SCSI status if the status is valid or a response + code (a non-zero return value for the execute-command procedure call) + if the status is not valid. + + For a valid status that indicates that the command has been + processed, but resulted in an exception (e.g., a SCSI CHECK + CONDITION), the PDU data segment contains the associated sense data. + The use of Autosense ([SAM2]) is REQUIRED by iSCSI. + + Some data segment content may also be associated (in the data + segment) with a non-zero response code. + + In addition, the SCSI-Response PDU carries information required for + the proper operation of the iSCSI protocol: + + - The number of Data-In PDUs that a target has sent (to enable + the initiator to check that all have arrived). + - StatSN - the Status Sequence Number on this connection. + + + + +Satran, et al. Standards Track [Page 43] + +RFC 3720 iSCSI April 2004 + + + - ExpCmdSN - the next Expected Command Sequence Number at the + target. + - MaxCmdSN - the maximum CmdSN acceptable at the target from + this initiator. + +3.5.1.3 Task Management Function Request + + The Task Management function request provides an initiator with a way + to explicitly control the execution of one or more SCSI Tasks or + iSCSI functions. The PDU carries a function identifier (which task + management function to perform) and enough information to + unequivocally identify the task or task-set on which to perform the + action, even if the task(s) to act upon has not yet arrived or has + been discarded due to an error. + + The referenced tag identifies an individual task if the function + refers to an individual task. + + The I_T_L nexus identifies task sets. In iSCSI the I_T_L nexus is + identified by the LUN and the session identification (the session + identifies an I_T nexus). + + For task sets, the CmdSN of the Task Management function request + helps identify the tasks upon which to act, namely all tasks + associated with a LUN and having a CmdSN preceding the Task + Management function request CmdSN. + + For a Task Management function, the coordination between responses to + the tasks affected and the Task Management function response is done + by the target. + +3.5.1.4. Task Management Function Response + + The Task Management function response carries an indication of + function completion for a Task Management function request including + how it was completed (response and qualifier) and additional + information for failure responses. + + After the Task Management response indicates Task Management function + completion, the initiator will not receive any additional responses + from the affected tasks. + +3.5.1.5. SCSI Data-Out and SCSI Data-In + + SCSI Data-Out and SCSI Data-In are the main vehicles by which SCSI + data payload is carried between initiator and target. Data payload + is associated with a specific SCSI command through the Initiator Task + Tag. For target convenience, outgoing solicited data also carries a + + + +Satran, et al. Standards Track [Page 44] + +RFC 3720 iSCSI April 2004 + + + Target Transfer Tag (copied from R2T) and the LUN. Each PDU contains + the payload length and the data offset relative to the buffer address + contained in the SCSI execute command procedure call. + + In each direction, the data transfer is split into "sequences". An + end-of-sequence is indicated by the F bit. + + An outgoing sequence is either unsolicited (only the first sequence + can be unsolicited) or consists of all the Data-Out PDUs sent in + response to an R2T. + + Input sequences are built to enable the direction switching for + bidirectional commands. + + For input, the target may request positive acknowledgement of input + data. This is limited to sessions that support error recovery and is + implemented through the A bit in the SCSI Data-In PDU header. + + Data-In and Data-Out PDUs also carry the DataSN to enable the + initiator and target to detect missing PDUs (discarded due to an + error). + + In addition, StatSN is carried by the Data-In PDUs. + + To enable a SCSI command to be processed while involving a minimum + number of messages, the last SCSI Data-In PDU passed for a command + may also contain the status if the status indicates termination with + no exceptions (no sense or response involved). + +3.5.1.6. Ready To Transfer (R2T) + + R2T is the mechanism by which the SCSI target "requests" the + initiator for output data. R2T specifies to the initiator the offset + of the requested data relative to the buffer address from the execute + command procedure call and the length of the solicited data. + + To help the SCSI target associate the resulting Data-Out with an R2T, + the R2T carries a Target Transfer Tag that will be copied by the + initiator in the solicited SCSI Data-Out PDUs. There are no protocol + specific requirements with regard to the value of these tags, but it + is assumed that together with the LUN, they will enable the target to + associate data with an R2T. + + + + + + + + + +Satran, et al. Standards Track [Page 45] + +RFC 3720 iSCSI April 2004 + + + R2T also carries information required for proper operation of the + iSCSI protocol, such as: + + - R2TSN (to enable an initiator to detect a missing R2T) + - StatSN + - ExpCmdSN + - MaxCmdSN + +3.5.2. Requests/Responses carrying SCSI and iSCSI Payload + +3.5.2.1. Asynchronous Message + + Asynchronous Messages are used to carry SCSI asynchronous events + (AEN) and iSCSI asynchronous messages. + + When carrying an AEN, the event details are reported as sense data in + the data segment. + +3.5.3. Requests/Responses Carrying iSCSI Only Payload + +3.5.3.1. Text Request and Text Response + + Text requests and responses are designed as a parameter negotiation + vehicle and as a vehicle for future extension. + + In the data segment, Text Requests/Responses carry text information + using a simple "key=value" syntax. + + Text Request/Responses may form extended sequences using the same + Initiator Task Tag. The initiator uses the F (Final) flag bit in the + text request header to indicate its readiness to terminate a + sequence. The target uses the F (Final) flag bit in the text + response header to indicate its consent to sequence termination. + + Text Request and Responses also use the Target Transfer Tag to + indicate continuation of an operation or a new beginning. A target + that wishes to continue an operation will set the Target Transfer Tag + in a Text Response to a value different from the default 0xffffffff. + An initiator willing to continue will copy this value into the Target + Transfer Tag of the next Text Request. If the initiator wants to + restart the current target negotiation (start fresh) will set the + Target Transfer Tag to 0xffffffff. + + Although a complete exchange is always started by the initiator, + specific parameter negotiations may be initiated by the initiator or + target. + + + + + +Satran, et al. Standards Track [Page 46] + +RFC 3720 iSCSI April 2004 + + +3.5.3.2. Login Request and Login Response + + Login Requests and Responses are used exclusively during the Login + Phase of each connection to set up the session and connection + parameters. (The Login Phase consists of a sequence of login + requests and responses carrying the same Initiator Task Tag.) + + A connection is identified by an arbitrarily selected connection-ID + (CID) that is unique within a session. + + Similar to the Text Requests and Responses, Login Requests/Responses + carry key=value text information with a simple syntax in the data + segment. + + The Login Phase proceeds through several stages (security + negotiation, operational parameter negotiation) that are selected + with two binary coded fields in the header -- the "current stage" + (CSG) and the "next stage" (NSG) with the appearance of the latter + being signaled by the "transit" flag (T). + + The first Login Phase of a session plays a special role, called the + leading login, which determines some header fields (e.g., the version + number, the maximum number of connections, and the session + identification). + + The CmdSN initial value is also set by the leading login. + + StatSN for each connection is initiated by the connection login. + + A login request may indicate an implied logout (cleanup) of the + connection to be logged in (a connection restart) by using the same + Connection ID (CID) as an existing connection, as well as the same + session identifying elements of the session to which the old + connection was associated. + +3.5.3.3. Logout Request and Response + + Logout Requests and Responses are used for the orderly closing of + connections for recovery or maintenance. The logout request may be + issued following a target prompt (through an asynchronous message) or + at an initiators initiative. When issued on the connection to be + logged out, no other request may follow it. + + The Logout Response indicates that the connection or session cleanup + is completed and no other responses will arrive on the connection (if + received on the logging out connection). In addition, the Logout + Response indicates how long the target will continue to hold + resources for recovery (e.g., command execution that continues on a + + + +Satran, et al. Standards Track [Page 47] + +RFC 3720 iSCSI April 2004 + + + new connection) in the text key Time2Retain and how long the + initiator must wait before proceeding with recovery in the text key + Time2Wait. + +3.5.3.4. SNACK Request + + With the SNACK Request, the initiator requests retransmission of + numbered-responses or data from the target. A single SNACK request + covers a contiguous set of missing items, called a run, of a given + type of items. The type is indicated in a type field in the PDU + header. The run is composed of an initial item (StatSN, DataSN, + R2TSN) and the number of missed Status, Data, or R2T PDUs. For long + Data-In sequences, the target may request (at predefined minimum + intervals) a positive acknowledgement for the data sent. A SNACK + request with a type field that indicates ACK and the number of + Data-In PDUs acknowledged conveys this positive acknowledgement. + +3.5.3.5. Reject + + Reject enables the target to report an iSCSI error condition (e.g., + protocol, unsupported option) that uses a Reason field in the PDU + header and includes the complete header of the bad PDU in the Reject + PDU data segment. + +3.5.3.6. NOP-Out Request and NOP-In Response + + This request/response pair may be used by an initiator and target as + a "ping" mechanism to verify that a connection/session is still + active and all of its components are operational. Such a ping may be + triggered by the initiator or target. The triggering party indicates + that it wants a reply by setting a value different from the default + 0xffffffff in the corresponding Initiator/Target Transfer Tag. + + NOP-In/NOP-Out may also be used "unidirectional" to convey to the + initiator/target command, status or data counter values when there is + no other "carrier" and there is a need to update the initiator/ + target. + +4. SCSI Mode Parameters for iSCSI + + There are no iSCSI specific mode pages. + +5. Login and Full Feature Phase Negotiation + + iSCSI parameters are negotiated at session or connection + establishment by using Login Requests and Responses (see Section + 3.2.3 iSCSI Login) and during the Full Feature Phase (Section 3.2.4 + iSCSI Full Feature Phase) by using Text Requests and Responses. In + + + +Satran, et al. Standards Track [Page 48] + +RFC 3720 iSCSI April 2004 + + + both cases the mechanism used is an exchange of iSCSI-text-key=value + pairs. For brevity iSCSI-text-keys are called just keys in the rest + of this document. + + Keys are either declarative or require negotiation and the key + description indicates if the key is declarative or requires + negotiation. + + For the declarative keys, the declaring party sets a value for the + key. The key specification indicates if the key can be declared by + the initiator, target or both. + + For the keys that require negotiation one of the parties (the + proposing party) proposes a value or set of values by including the + key=value in the data part of a Login or Text Request or Response + PDUs. The other party (the accepting party) makes a selection based + on the value or list of values proposed and includes the selected + value in a key=value in the data part of one of the following Login + or Text Response or Request PDUs. For most of the keys both the + initiator and target can be proposing parties. + + The login process proceeds in two stages - the security negotiation + stage and the operational parameter negotiation stage. Both stages + are optional but at least one of them has to be present to enable the + setting of some mandatory parameters. + + If present, the security negotiation stage precedes the operational + parameter negotiation stage. + + Progression from stage to stage is controlled by the T (Transition) + bit in the Login Request/Response PDU header. Through the T bit set + to 1, the initiator indicates that it would like to transition. The + target agrees to the transition (and selects the next stage) when + ready. A field in the Login PDU header indicates the current stage + (CSG) and during transition, another field indicates the next stage + (NSG) proposed (initiator) and selected (target). + + The text negotiation process is used to negotiate or declare + operational parameters. The negotiation process is controlled by the + F (final) bit in the PDU header. During text negotiations, the F bit + is used by the initiator to indicate that it is ready to finish the + negotiation and by the Target to acquiesce the end of negotiation. + + Since some key=value pairs may not fit entirely in a single PDU, the + C (continuation) bit is used (both in Login and Text) to indicate + that "more follows". + + + + + +Satran, et al. Standards Track [Page 49] + +RFC 3720 iSCSI April 2004 + + + The text negotiation uses an additional mechanism by which a target + may deliver larger amounts of data to an enquiring initiator. The + target sets a Target Task Tag to be used as a bookmark that when + returned by the initiator, means "go on". If reset to a "neutral + value", it means "forget about the rest". + + This chapter details types of keys and values used, the syntax rules + for parameter formation, and the negotiation schemes to be used with + different types of parameters. + +5.1. Text Format + + The initiator and target send a set of key=value pairs encoded in + UTF-8 Unicode. All the text keys and text values specified in this + document are to be presented and interpreted in the case in which + they appear in this document. They are case sensitive. + + The following character symbols are used in this document for text + items (the hexadecimal values represent Unicode code points): + + (a-z, A-Z) - letters + (0-9) - digits + " " (0x20) - space + "." (0x2e) - dot + "-" (0x2d) - minus + "+" (0x2b) - plus + "@" (0x40) - commercial at + "_" (0x5f) - underscore + "=" (0x3d) - equal + ":" (0x3a) - colon + "/" (0x2f) - solidus or slash + "[" (0x5b) - left bracket + "]" (0x5d) - right bracket + null (0x00) - null separator + "," (0x2c) - comma + "~" (0x7e) - tilde + + Key=value pairs may span PDU boundaries. An initiator or target that + sends partial key=value text within a PDU indicates that more text + follows by setting the C bit in the Text or Login Request or Text or + Login Response to 1. Data segments in a series of PDUs that have the + C bit set to 1 and end with a PDU that have the C bit set to 0, or + include a single PDU that has the C bit set to 0, have to be + considered as forming a single logical-text-data-segment (LTDS). + + Every key=value pair, including the last or only pair in a LTDS, MUST + be followed by one null (0x00) delimiter. + + + + +Satran, et al. Standards Track [Page 50] + +RFC 3720 iSCSI April 2004 + + + A key-name is whatever precedes the first "=" in the key=value pair. + The term key is used frequently in this document in place of + key-name. + + A value is whatever follows the first "=" in the key=value pair up to + the end of the key=value pair, but not including the null delimiter. + + The following definitions will be used in the rest of this document: + + standard-label: A string of one or more characters that consist of + letters, digits, dot, minus, plus, commercial at, or underscore. + A standard-label MUST begin with a capital letter and must not + exceed 63 characters. + + key-name: A standard-label. + + text-value: A string of zero or more characters that consist of + letters, digits, dot, minus, plus, commercial at, underscore, + slash, left bracket, right bracket, or colon. + + iSCSI-name-value: A string of one or more characters that consist + of minus, dot, colon, or any character allowed by the output of + the iSCSI string-prep template as specified in [RFC3722] (see + also Section 3.2.6.2 iSCSI Name Encoding). + + iSCSI-local-name-value: A UTF-8 string; no null characters are + allowed in the string. This encoding is to be used for localized + (internationalized) aliases. + + boolean-value: The string "Yes" or "No". + + hex-constant: A hexadecimal constant encoded as a string that + starts with "0x" or "0X" followed by one or more digits or the + letters a, b, c, d, e, f, A, B, C, D, E, or F. Hex-constants are + used to encode numerical values or binary strings. When used to + encode numerical values, the excessive use of leading 0 digits is + discouraged. The string following 0X (or 0x) represents a base16 + number that starts with the most significant base16 digit, + followed by all other digits in decreasing order of significance + and ending with the least-significant base16 digit. When used to + encode binary strings, hexadecimal constants have an implicit + byte-length that includes four bits for every hexadecimal digit + of the constant, including leading zeroes. For example, a + hex-constant of n hexadecimal digits has a byte-length of (the + integer part of) (n+1)/2. + + + + + + +Satran, et al. Standards Track [Page 51] + +RFC 3720 iSCSI April 2004 + + + decimal-constant: An unsigned decimal number with the digit 0 or a + string of one or more digits that start with a non-zero digit. + Decimal-constants are used to encode numerical values or binary + strings. Decimal constants can only be used to encode binary + strings if the string length is explicitly specified. There is + no implicit length for decimal strings. Decimal-constant MUST + NOT be used for parameter values if the values can be equal or + greater than 2**64 (numerical) or for binary strings that can be + longer than 64 bits. + + base64-constant: base64 constant encoded as a string that starts + with "0b" or "0B" followed by 1 or more digits or letters or plus + or slash or equal. The encoding is done according to [RFC2045] + and each character, except equal, represents a base64 digit or a + 6-bit binary string. Base64-constants are used to encode + numerical-values or binary strings. When used to encode + numerical values, the excessive use of leading 0 digits (encoded + as A) is discouraged. The string following 0B (or 0b) represents + a base64 number that starts with the most significant base64 + digit, followed by all other digits in decreasing order of + significance and ending with the least-significant base64 digit; + the least significant base64 digit may be optionally followed by + pad digits (encoded as equal) that are not considered as part of + the number. When used to encode binary strings, base64-constants + have an implicit + byte-length that includes six bits for every character of the + constant, excluding trailing equals (i.e., a base64-constant of n + base64 characters excluding the trailing equals has a byte-length + of ((the integer part of) (n*3/4)). Correctly encoded base64 + strings cannot have n values of 1, 5 ... k*4+1. + + numerical-value: An unsigned integer always less than 2**64 encoded + as a decimal-constant or a hex-constant. Unsigned integer + arithmetic applies to numerical-values. + + large-numerical-value: An unsigned integer that can be larger than + or equal to 2**64 encoded as a hex constant, or + base64-constant. Unsigned integer arithmetic applies to + large-numeric-values. + + numeric-range: Two numerical-values separated by a tilde where the + value to the right of tilde must not be lower than the value to + the left. + + regular-binary-value: A binary string not longer than 64 bits + encoded as a decimal constant, hex constant, or base64-constant. + The length of the string is either specified by the key + definition or is the implicit byte-length of the encoded string. + + + +Satran, et al. Standards Track [Page 52] + +RFC 3720 iSCSI April 2004 + + + large-binary-value: A binary string longer than 64 bits encoded as + a hex-constant or base64-constant. The length of the string is + either specified by the key definition or is the implicit + byte-length of the encoded string. + + binary-value: A regular-binary-value or a large-binary-value. + Operations on binary values are key specific. + + simple-value: Text-value, iSCSI-name-value, boolean-value, + numeric-value, a numeric-range, or a binary-value. + + list-of-values: A sequence of text-values separated by a comma. + + If not otherwise specified, the maximum length of a simple-value (not + its encoded representation) is 255 bytes, not including the delimiter + (comma or zero byte). + + Any iSCSI target or initiator MUST support receiving at least 8192 + bytes of key=value data in a negotiation sequence. When proposing or + accepting authentication methods that explicitly require support for + very long authentication items, the initiator and target MUST support + receiving of at least 64 kilobytes of key=value data (see Appendix + 11.1.2 - Simple Public-Key Mechanism (SPKM) - that require support + for public key certificates). + +5.2. Text Mode Negotiation + + During login, and thereafter, some session or connection parameters + are either declared or negotiated through an exchange of textual + information. + + The initiator starts the negotiation and/or declaration through a + Text or Login Request and indicates when it is ready for completion + (by setting the F bit to 1 and keeping it to 1 in a Text Request or + the T bit in the Login Request). As negotiation text may span PDU + boundaries, a Text or Login Request or Text or Login Response PDU + that has the C bit set to 1 MUST NOT have the F/T bit set to 1. + + A target receiving a Text or Login Request with the C bit set to 1 + MUST answer with a Text or Login Response with no data segment + (DataSegmentLength 0). An initiator receiving a Text or Login + Response with the C bit set to 1 MUST answer with a Text or Login + Request with no data segment (DataSegmentLength 0). + + A target or initiator SHOULD NOT use a Text or Login Response or Text + or Login Request with no data segment (DataSegmentLength 0) unless + explicitly required by a general or a key-specific negotiation rule. + + + + +Satran, et al. Standards Track [Page 53] + +RFC 3720 iSCSI April 2004 + + + The format of a declaration is: + + Declarer-> <key>=<valuex> + + The general format of text negotiation is: + + Proposer-> <key>=<valuex> + Acceptor-> <key>={<valuey>|NotUnderstood|Irrelevant|Reject} + + Thus a declaration is a one-way textual exchange while a negotiation + is a two-way exchange. + + The proposer or declarer can either be the initiator or the target, + and the acceptor can either be the target or initiator, respectively. + Targets are not limited to respond to key=value pairs as proposed by + the initiator. The target may propose key=value pairs of its own. + + All negotiations are explicit (i.e., the result MUST only be based on + newly exchanged or declared values). There are no implicit + proposals. If a proposal is not made, then a reply cannot be + expected. Conservative design also requires that default values + should not be relied upon when use of some other value has serious + consequences. + + The value proposed or declared can be a numerical-value, a + numerical-range defined by lower and upper values with both integers + separated by a tilde, a binary value, a text-value, an + iSCSI-name-value, an iSCSI-local-name-value, a boolean-value (Yes or + No), or a list of comma separated text-values. A range, a + large-numerical-value, an iSCSI-name-value and an + iSCSI-local-name-value MAY ONLY be used if it is explicitly allowed. + An accepted value can be a numerical-value, a large-numerical-value, + a text-value, or a boolean-value. + + If a specific key is not relevant for the current negotiation, the + acceptor may answer with the constant "Irrelevant" for all types of + negotiation. However the negotiation is not considered as failed if + the answer is "Irrelevant". The "Irrelevant" answer is meant for + those cases in which several keys are presented by a proposing party + but the selection made by the acceptor for one of the keys makes + other keys irrelevant. The following example illustrates the use of + "Irrelevant": + + I->T OFMarker=Yes,OFMarkInt=2048~8192 + T->I OFMarker=No,OFMarkInt=Irrelevant + + I->T X#vkey1=(bla,alb,None),X#vkey2=(bla,alb) + T->I X#vkey1=None,X#vkey2=Irrelevant + + + +Satran, et al. Standards Track [Page 54] + +RFC 3720 iSCSI April 2004 + + + + Any key not understood by the acceptor may be ignored by the acceptor + without affecting the basic function. However, the answer for a key + not understood MUST be key=NotUnderstood. + + The constants "None", "Reject", "Irrelevant", and "NotUnderstood" are + reserved and MUST ONLY be used as described here. Violation of this + rule is a protocol error (in particular the use of "Reject", + "Irrelevant", and "NotUnderstood" as proposed values). + + Reject or Irrelevant are legitimate negotiation options where allowed + but their excessive use is discouraged. A negotiation is considered + complete when the acceptor has sent the key value pair even if the + value is "Reject", "Irrelevant", or "NotUnderstood. Sending the key + again would be a re-negotiation and is forbidden for many keys. + + If the acceptor sends "Reject" as an answer the negotiated key is + left at its current value (or default if no value was set). If the + current value is not acceptable to the proposer on the connection or + to the session it is sent, the proposer MAY choose to terminate the + connection or session. + + All keys in this document, except for the X extension formats, MUST + be supported by iSCSI initiators and targets when used as specified + here. If used as specified, these keys MUST NOT be answered with + NotUnderstood. + + Implementers may introduce new keys by prefixing them with + "X-", followed by their (reversed) domain name, or with new keys + registered with IANA prefixing them with X#. For example, the entity + owning the domain example.com can issue: + + X-com.example.bar.foo.do_something=3 + + or a new registered key may be used as in: + + X#SuperCalyPhraGilistic=Yes + + Implementers MAY also introduce new values, but ONLY for new keys or + authentication methods (see Section 11 iSCSI Security Text Keys and + Authentication Methods), or digests (see Section 12.1 HeaderDigest + and DataDigest). + + Whenever parameter action or acceptance is dependent on other + parameters, the dependency rules and parameter sequence must be + specified with the parameters. + + + + + +Satran, et al. Standards Track [Page 55] + +RFC 3720 iSCSI April 2004 + + + In the Login Phase (see Section 5.3 Login Phase), every stage is a + separate negotiation. In the FullFeaturePhase, a Text Request + Response sequence is a negotiation. Negotiations MUST be handled as + atomic operations. For example, all negotiated values go into effect + after the negotiation concludes in agreement or are ignored if the + negotiation fails. + + Some parameters may be subject to integrity rules (e.g., parameter-x + must not exceed parameter-y or parameter-u not 1 implies parameter-v + be Yes). Whenever required, integrity rules are specified with the + keys. Checking for compliance with the integrity rule must only be + performed after all the parameters are available (the existent and + the newly negotiated). An iSCSI target MUST perform integrity + checking before the new parameters take effect. An initiator MAY + perform integrity checking. + + An iSCSI initiator or target MAY terminate a negotiation that does + not end within a reasonable time or number of exchanges. + +5.2.1. List negotiations + + In list negotiation, the originator sends a list of values (which may + include "None") in its order of preference. + + The responding party MUST respond with the same key and the first + value that it supports (and is allowed to use for the specific + originator) selected from the originator list. + + The constant "None" MUST always be used to indicate a missing + function. However, "None" is only a valid selection if it is + explicitly proposed. + + If an acceptor does not understand any particular value in a list, it + MUST ignore it. If an acceptor does not support, does not + understand, or is not allowed to use any of the proposed options with + a specific originator, it may use the constant "Reject" or terminate + the negotiation. The selection of a value not proposed MUST be + handled as a protocol error. + +5.2.2. Simple-value Negotiations + + For simple-value negotiations, the accepting party MUST answer with + the same key. The value it selects becomes the negotiation result. + + Proposing a value not admissible (e.g., not within the specified + bounds) MAY be answered with the constant "Reject" or the acceptor + MAY select an admissible value. + + + + +Satran, et al. Standards Track [Page 56] + +RFC 3720 iSCSI April 2004 + + + The selection by the acceptor, of a value not admissible under the + selection rules is considered a protocol error. The selection rules + are key-specific. + + For a numerical range, the value selected must be an integer within + the proposed range or "Reject" (if the range is unacceptable). + + In Boolean negotiations (i.e., those that result in keys taking the + values Yes or No), the accepting party MUST answer with the same key + and the result of the negotiation when the received value does not + determine that result by itself. The last value transmitted becomes + the negotiation result. The rules for selecting the value to answer + with are expressed as Boolean functions of the value received, and + the value that the accepting party would have selected if given a + choice. + + Specifically, the two cases in which answers are OPTIONAL are: + + - The Boolean function is "AND" and the value "No" is received. + The outcome of the negotiation is "No". + - The Boolean function is "OR" and the value "Yes" is received. + The outcome of the negotiation is "Yes". + + Responses are REQUIRED in all other cases, and the value chosen and + sent by the acceptor becomes the outcome of the negotiation. + +5.3. Login Phase + + The Login Phase establishes an iSCSI connection between an initiator + and a target; it also creates a new session or associates the + connection to an existing session. The Login Phase sets the iSCSI + protocol parameters, security parameters, and authenticates the + initiator and target to each other. + + The Login Phase is only implemented via Login Request and Responses. + The whole Login Phase is considered as a single task and has a single + Initiator Task Tag (similar to the linked SCSI commands). + + The default MaxRecvDataSegmentLength is used during Login. + + The Login Phase sequence of requests and responses proceeds as + follows: + + - Login initial request + - Login partial response (optional) + - More Login Requests and Responses (optional) + - Login Final-Response (mandatory) + + + + +Satran, et al. Standards Track [Page 57] + +RFC 3720 iSCSI April 2004 + + + The initial Login Request of any connection MUST include the + InitiatorName key=value pair. The initial Login Request of the first + connection of a session MAY also include the SessionType key=value + pair. For any connection within a session whose type is not + "Discovery", the first Login Request MUST also include the TargetName + key=value pair. + + The Login Final-response accepts or rejects the Login Request. + + The Login Phase MAY include a SecurityNegotiation stage and a + LoginOperationalNegotiation stage or both, but MUST include at least + one of them. The included stage MAY be empty except for the + mandatory names. + + The Login Requests and Responses contain a field (CSG) that indicates + the current negotiation stage (SecurityNegotiation or + LoginOperationalNegotiation). If both stages are used, the + SecurityNegotiation MUST precede the LoginOperationalNegotiation. + + Some operational parameters can be negotiated outside the login + through Text Requests and Responses. + + Security MUST be completely negotiated within the Login Phase. The + use of underlying IPsec security is specified in Chapter 8 and in + [RFC3723]. iSCSI support for security within the protocol only + consists of authentication in the Login Phase. + + In some environments, a target or an initiator is not interested in + authenticating its counterpart. It is possible to bypass + authentication through the Login Request and Response. + + The initiator and target MAY want to negotiate iSCSI authentication + parameters. Once this negotiation is completed, the channel is + considered secure. + + Most of the negotiation keys are only allowed in a specific stage. + The SecurityNegotiation keys appear in Chapter 11 and the + LoginOperationalNegotiation keys appear in Chapter 12. Only a + limited set of keys (marked as Any-Stage in Chapter 12) may be used + in any of the two stages. + + Any given Login Request or Response belongs to a specific stage; this + determines the negotiation keys allowed with the request or response. + It is considered to be a protocol error to send a key that is not + allowed in the current stage. + + + + + + +Satran, et al. Standards Track [Page 58] + +RFC 3720 iSCSI April 2004 + + + Stage transition is performed through a command exchange (request/ + response) that carries the T bit and the same CSG code. During this + exchange, the next stage is selected by the target through the "next + stage" code (NSG). The selected NSG MUST NOT exceed the value stated + by the initiator. The initiator can request a transition whenever it + is ready, but a target can only respond with a transition after one + is proposed by the initiator. + + In a negotiation sequence, the T bit settings in one pair of Login + Request-Responses have no bearing on the T bit settings of the next + pair. An initiator that has a T bit set to 1 in one pair and is + answered with a T bit setting of 0, may issue the next request with + the T bit set to 0. + + When a transition is requested by the initiator and acknowledged by + the target, both the initiator and target switch to the selected + stage. + + Targets MUST NOT submit parameters that require an additional + initiator Login Request in a Login Response with the T bit set to 1. + + Stage transitions during login (including entering and exit) are only + possible as outlined in the following table: + + +-----------------------------------------------------------+ + |From To -> | Security | Operational | FullFeature | + | | | | | | + | V | | | | + +-----------------------------------------------------------+ + | (start) | yes | yes | no | + +-----------------------------------------------------------+ + | Security | no | yes | yes | + +-----------------------------------------------------------+ + | Operational | no | no | yes | + +-----------------------------------------------------------+ + + The Login Final-Response that accepts a Login Request can only come + as a response to a Login Request with the T bit set to 1, and both + the request and response MUST indicate FullFeaturePhase as the next + phase via the NSG field. + + Neither the initiator nor the target should attempt to declare or + negotiate a parameter more than once during login except for + responses to specific keys that explicitly allow repeated key + declarations (e.g., TargetAddress). An attempt to + renegotiate/redeclare parameters not specifically allowed MUST be + detected by the initiator and target. If such an attempt is detected + + + + +Satran, et al. Standards Track [Page 59] + +RFC 3720 iSCSI April 2004 + + + by the target, the target MUST respond with Login reject (initiator + error); if detected by the initiator, the initiator MUST drop the + connection. + +5.3.1. Login Phase Start + + The Login Phase starts with a Login Request from the initiator to the + target. The initial Login Request includes: + + - Protocol version supported by the initiator. + - iSCSI Initiator Name and iSCSI Target Name + - ISID, TSIH, and connection Ids + - Negotiation stage that the initiator is ready to enter. + + A login may create a new session or it may add a connection to an + existing session. Between a given iSCSI Initiator Node (selected + only by an InitiatorName) and a given iSCSI target defined by an + iSCSI TargetName and a Target Portal Group Tag, the login results are + defined by the following table: + + + +------------------------------------------------------------------+ + |ISID | TSIH | CID | Target action | + +------------------------------------------------------------------+ + |new | non-zero | any | fail the login | + | | | | ("session does not exist") | + +------------------------------------------------------------------+ + |new | zero | any | instantiate a new session | + +------------------------------------------------------------------+ + |existing | zero | any | do session reinstatement | + | | | | (see section 5.3.5) | + +------------------------------------------------------------------+ + |existing | non-zero | new | add a new connection to | + | | existing | | the session | + +------------------------------------------------------------------+ + |existing | non-zero |existing| do connection reinstatement| + | | existing | | (see section 5.3.4) | + +------------------------------------------------------------------+ + |existing | non-zero | any | fail the login | + | | new | | ("session does not exist") | + +------------------------------------------------------------------+ + + Determination of "existing" or "new" are made by the target. + + + + + + + + +Satran, et al. Standards Track [Page 60] + +RFC 3720 iSCSI April 2004 + + + Optionally, the Login Request may include: + + - Security parameters + OR + - iSCSI operational parameters + AND/OR + - The next negotiation stage that the initiator is ready to + enter. + + The target can answer the login in the following ways: + + - Login Response with Login reject. This is an immediate rejection + from the target that causes the connection to terminate and the + session to terminate if this is the first (or only) connection of + a new session. The T bit and the CSG and NSG fields are + reserved. + - Login Response with Login Accept as a final response (T bit set + to 1 and the NSG in both request and response are set to + FullFeaturePhase). The response includes the protocol version + supported by the target and the session ID, and may include iSCSI + operational or security parameters (that depend on the current + stage). + - Login Response with Login Accept as a partial response (NSG not + set to FullFeaturePhase in both request and response) that + indicates the start of a negotiation sequence. The response + includes the protocol version supported by the target and either + security or iSCSI parameters (when no security mechanism is + chosen) supported by the target. + + If the initiator decides to forego the SecurityNegotiation stage, it + issues the Login with the CSG set to LoginOperationalNegotiation and + the target may reply with a Login Response that indicates that it is + unwilling to accept the connection (see Section 10.13 Login Response) + without SecurityNegotiation and will terminate the connection with a + response of Authentication failure (see Section 10.13.5 Status-Class + and Status-Detail). + + If the initiator is willing to negotiate iSCSI security, but is + unwilling to make the initial parameter proposal and may accept a + connection without iSCSI security, it issues the Login with the T bit + set to 1, the CSG set to SecurityNegotiation, and the NSG set to + LoginOperationalNegotiation. If the target is also ready to skip + security, the Login Response only contains the TargetPortalGroupTag + key (see Section 12.9 TargetPortalGroupTag), the T bit set to 1, the + CSG set to SecurityNegotiation, and the NSG set to + LoginOperationalNegotiation. + + + + + +Satran, et al. Standards Track [Page 61] + +RFC 3720 iSCSI April 2004 + + + An initiator that chooses to operate without iSCSI security, with all + the operational parameters taking the default values, issues the + Login with the T bit set to 1, the CSG set to + LoginOperationalNegotiation, and the NSG set to FullFeaturePhase. If + the target is also ready to forego security and can finish its + LoginOperationalNegotiation, the Login Response has T bit set to 1, + the CSG set to LoginOperationalNegotiation, and the NSG set to + FullFeaturePhase in the next stage. + + During the Login Phase the iSCSI target MUST return the + TargetPortalGroupTag key with the first Login Response PDU with which + it is allowed to do so (i.e., the first Login Response issued after + the first Login Request with the C bit set to 0) for all session + types when TargetName is given and the response is not a redirection. + The TargetPortalGroupTag key value indicates the iSCSI portal group + servicing the Login Request PDU. If the reconfiguration of iSCSI + portal groups is a concern in a given environment, the iSCSI + initiator should use this key to ascertain that it had indeed + initiated the Login Phase with the intended target portal group. + +5.3.2. iSCSI Security Negotiation + + The security exchange sets the security mechanism and authenticates + the initiator user and the target to each other. The exchange + proceeds according to the authentication method chosen in the + negotiation phase and is conducted using the Login Requests' and + responses' key=value parameters. + + An initiator directed negotiation proceeds as follows: + + - The initiator sends a Login Request with an ordered list of the + options it supports (authentication algorithm). The options are + listed in the initiator's order of preference. The initiator MAY + also send private or public extension options. + + - The target MUST reply with the first option in the list it + supports and is allowed to use for the specific initiator unless + it does not support any, in which case it MUST answer with + "Reject" (see Section 5.2 Text Mode Negotiation). The parameters + are encoded in UTF8 as key=value. For security parameters, see + Chapter 11. + + - When the initiator considers that it is ready to conclude the + SecurityNegotiation stage, it sets the T bit to 1 and the NSG to + what it would like the next stage to be. The target will then + set the T bit to 1 and set the NSG to the next stage in the Login + Response when it finishes sending its security keys. The next + + + + +Satran, et al. Standards Track [Page 62] + +RFC 3720 iSCSI April 2004 + + + stage selected will be the one the target selected. If the next + stage is FullFeaturePhase, the target MUST respond with a Login + Response with the TSIH value. + + If the security negotiation fails at the target, then the target MUST + send the appropriate Login Response PDU. If the security negotiation + fails at the initiator, the initiator SHOULD close the connection. + + It should be noted that the negotiation might also be directed by the + target if the initiator does support security, but is not ready to + direct the negotiation (propose options). + +5.3.3. Operational Parameter Negotiation During the Login Phase + + Operational parameter negotiation during the login MAY be done: + + - Starting with the first Login Request if the initiator does not + propose any security/integrity option. + + - Starting immediately after the security negotiation if the + initiator and target perform such a negotiation. + + Operational parameter negotiation MAY involve several Login + Request-Response exchanges started and terminated by the initiator. + The initiator MUST indicate its intent to terminate the negotiation + by setting the T bit to 1; the target sets the T bit to 1 on the last + response. + + If the target responds to a Login Request that has the T bit set to 1 + with a Login Response that has the T bit set to 0, the initiator + should keep sending the Login Request (even empty) with the T bit set + to 1, while it still wants to switch stage, until it receives the + Login Response that has the T bit set to 1 or it receives a key that + requires it to set the T bit to 0. + + Some session specific parameters can only be specified during the + Login Phase of the first connection of a session (i.e., begun by a + Login Request that contains a zero-valued TSIH) - the leading Login + Phase (e.g., the maximum number of connections that can be used for + this session). + + A session is operational once it has at least one connection in + FullFeaturePhase. New or replacement connections can only be added + to a session after the session is operational. + + For operational parameters, see Chapter 12. + + + + + +Satran, et al. Standards Track [Page 63] + +RFC 3720 iSCSI April 2004 + + +5.3.4. Connection Reinstatement + + Connection reinstatement is the process of an initiator logging in + with an ISID-TSIH-CID combination that is possibly active from the + target's perspective, which causes the implicit logging out of the + connection corresponding to the CID, and reinstating a new Full + Feature Phase iSCSI connection in its place (with the same CID). + Thus, the TSIH in the Login PDU MUST be non-zero and the CID does not + change during a connection reinstatement. The Login Request performs + the logout function of the old connection if an explicit logout was + not performed earlier. In sessions with a single connection, this + may imply the opening of a second connection with the sole purpose of + cleaning up the first. Targets MUST support opening a second + connection even when they do not support multiple connections in Full + Feature Phase if ErrorRecoveryLevel is 2 and SHOULD support opening a + second connection if ErrorRecoveryLevel is less than 2. + + If the operational ErrorRecoveryLevel is 2, connection reinstatement + enables future task reassignment. If the operational + ErrorRecoveryLevel is less than 2, connection reinstatement is the + replacement of the old CID without enabling task reassignment. In + this case, all the tasks that were active on the old CID must be + immediately terminated without further notice to the initiator. + + The initiator connection state MUST be CLEANUP_WAIT (section 7.1.3) + when the initiator attempts a connection reinstatement. + + In practical terms, in addition to the implicit logout of the old + connection, reinstatement is equivalent to a new connection login. + +5.3.5. Session Reinstatement, Closure, and Timeout + + Session reinstatement is the process of the initiator logging in with + an ISID that is possibly active from the target's perspective. Thus + implicitly logging out the session that corresponds to the ISID and + reinstating a new iSCSI session in its place (with the same ISID). + Therefore, the TSIH in the Login PDU MUST be zero to signal session + reinstatement. Session reinstatement causes all the tasks that were + active on the old session to be immediately terminated by the target + without further notice to the initiator. + + The initiator session state MUST be FAILED (Section 7.3 Session State + Diagrams) when the initiator attempts a session reinstatement. + + + + + + + + +Satran, et al. Standards Track [Page 64] + +RFC 3720 iSCSI April 2004 + + + Session closure is an event defined to be one of the following: + + - A successful "session close" logout. + - A successful "connection close" logout for the last Full Feature + Phase connection when no other connection in the session is + waiting for cleanup (Section 7.2 Connection Cleanup State Diagram + for Initiators and Targets) and no tasks in the session are + waiting for reassignment. + + Session timeout is an event defined to occur when the last connection + state timeout expires and no tasks are waiting for reassignment. + This takes the session to the FREE state (N6 transition in the + session state diagram). + +5.3.5.1. Loss of Nexus Notification + + The iSCSI layer provides the SCSI layer with the "I_T nexus loss" + notification when any one of the following events happens: + + a) Successful completion of session reinstatement. + b) Session closure event. + c) Session timeout event. + + Certain SCSI object clearing actions may result due to the + notification in the SCSI end nodes, as documented in Appendix F. + - Clearing Effects of Various Events on Targets -. + +5.3.6. Session Continuation and Failure + + Session continuation is the process by which the state of a + preexisting session continues to be used by connection reinstatement + (Section 5.3.4 Connection Reinstatement), or by adding a connection + with a new CID. Either of these actions associates the new transport + connection with the session state. + + Session failure is an event where the last Full Feature Phase + connection reaches the CLEANUP_WAIT state (Section 7.2 Connection + Cleanup State Diagram for Initiators and Targets), or completes a + successful recovery logout, thus causing all active tasks (that are + formerly allegiant to the connection) to start waiting for task + reassignment. + + + + + + + + + + +Satran, et al. Standards Track [Page 65] + +RFC 3720 iSCSI April 2004 + + +5.4. Operational Parameter Negotiation Outside the Login Phase + + Some operational parameters MAY be negotiated outside (after) the + Login Phase. + + Parameter negotiation in Full Feature Phase is done through Text + requests and responses. Operational parameter negotiation MAY + involve several Text request-response exchanges, which the initiator + always starts and terminates using the same Initiator Task Tag. The + initiator MUST indicate its intent to terminate the negotiation by + setting the F bit to 1; the target sets the F bit to 1 on the last + response. + + If the target responds to a Text request with the F bit set to 1 and + with a Text response with the F bit set to 0, the initiator should + keep sending the Text request (even empty) with the F bit set to 1, + while it still wants to finish the negotiation, until it receives the + Text response with the F bit set to 1. Responding to a Text request + with the F bit set to 1 with an empty (no key=value pairs) response + with the F bit set to 0 is discouraged. + + Targets MUST NOT submit parameters that require an additional + initiator Text request in a Text response with the F bit set to 1. + + In a negotiation sequence, the F bit settings in one pair of Text + request-responses have no bearing on the F bit settings of the next + pair. An initiator that has the F bit set to 1 in a request and is + being answered with an F bit setting of 0 may issue the next request + with the F bit set to 0. + + Whenever the target responds with the F bit set to 0, it MUST set the + Target Transfer Tag to a value other than the default 0xffffffff. + + An initiator MAY reset an operational parameter negotiation by + issuing a Text request with the Target Transfer Tag set to the value + 0xffffffff after receiving a response with the Target Transfer Tag + set to a value other than 0xffffffff. A target may reset an + operational parameter negotiation by answering a Text request with a + Reject PDU. + + Neither the initiator nor the target should attempt to declare or + negotiate a parameter more than once during any negotiation sequence + without an intervening operational parameter negotiation reset, + except for responses to specific keys that explicitly allow repeated + key declarations (e.g., TargetAddress). If detected by the target, + this MUST result in a Reject PDU with a reason of "protocol error". + The initiator MUST reset the negotiation as outlined above. + + + + +Satran, et al. Standards Track [Page 66] + +RFC 3720 iSCSI April 2004 + + + Parameters negotiated by a text exchange negotiation sequence only + become effective after the negotiation sequence is completed. + +6. iSCSI Error Handling and Recovery + +6.1. Overview + +6.1.1. Background + + The following two considerations prompted the design of much of the + error recovery functionality in iSCSI: + + i) An iSCSI PDU may fail the digest check and be dropped, despite + being received by the TCP layer. The iSCSI layer must + optionally be allowed to recover such dropped PDUs. + ii) A TCP connection may fail at any time during the data + transfer. All the active tasks must optionally be allowed to + continue on a different TCP connection within the same + session. + + Implementations have considerable flexibility in deciding what degree + of error recovery to support, when to use it and by which mechanisms + to achieve the required behavior. Only the externally visible + actions of the error recovery mechanisms must be standardized to + ensure interoperability. + + This chapter describes a general model for recovery in support of + interoperability. See Appendix E. - Algorithmic Presentation of + Error Recovery Classes - for further detail on how the described + model may be implemented. Compliant implementations do not have to + match the implementation details of this model as presented, but the + external behavior of such implementations must correspond to the + externally observable characteristics of the presented model. + +6.1.2. Goals + + The major design goals of the iSCSI error recovery scheme are as + follows: + + a) Allow iSCSI implementations to meet different requirements by + defining a collection of error recovery mechanisms that + implementations may choose from. + b) Ensure interoperability between any two implementations + supporting different sets of error recovery capabilities. + c) Define the error recovery mechanisms to ensure command + ordering even in the face of errors, for initiators that + demand ordering. + + + + +Satran, et al. Standards Track [Page 67] + +RFC 3720 iSCSI April 2004 + + + d) Do not make additions in the fast path, but allow moderate + complexity in the error recovery path. + e) Prevent both the initiator and target from attempting to + recover the same set of PDUs at the same time. For example, + there must be a clear "error recovery functionality + distribution" between the initiator and target. + +6.1.3. Protocol Features and State Expectations + + The initiator mechanisms defined in connection with error recovery + are: + + a) NOP-OUT to probe sequence numbers of the target (section + 10.18) + b) Command retry (section 6.2.1) + c) Recovery R2T support (section 6.7) + d) Requesting retransmission of status/data/R2T using the SNACK + facility (section 10.16) + e) Acknowledging the receipt of the data (section 10.16) + f) Reassigning the connection allegiance of a task to a different + TCP connection (section 6.2.2) + g) Terminating the entire iSCSI session to start afresh (section + 6.1.4.4) + + The target mechanisms defined in connection with error recovery are: + + a) NOP-IN to probe sequence numbers of the initiator (section + 10.19) + b) Requesting retransmission of data using the recovery R2T + feature (section 6.7) + c) SNACK support (section 10.16) d) Requesting that parts of + read data be acknowledged (section 10.7.2) + e) Allegiance reassignment support (section 6.2.2) + f) Terminating the entire iSCSI session to force the initiator to + start over (section 6.1.4.4) + + For any outstanding SCSI command, it is assumed that iSCSI, in + conjunction with SCSI at the initiator, is able to keep enough + information to be able to rebuild the command PDU, and that outgoing + data is available (in host memory) for retransmission while the + command is outstanding. It is also assumed that at the target, + incoming data (read data) MAY be kept for recovery or it can be + reread from a device server. + + It is further assumed that a target will keep the "status & sense" + for a command it has executed if it supports status retransmission. + A target that agrees to support data retransmission is expected to be + prepared to retransmit the outgoing data (i.e., Data-In) on request + + + +Satran, et al. Standards Track [Page 68] + +RFC 3720 iSCSI April 2004 + + + until either the status for the completed command is acknowledged, or + the data in question has been separately acknowledged. + +6.1.4. Recovery Classes + + iSCSI enables the following classes of recovery (in the order of + increasing scope of affected iSCSI tasks): + + - Within a command (i.e., without requiring command restart). + - Within a connection (i.e., without requiring the connection to + be rebuilt, but perhaps requiring command restart). + - Connection recovery (i.e., perhaps requiring connections to be + rebuilt and commands to be reissued). + - Session recovery. + + The recovery scenarios detailed in the rest of this section are + representative rather than exclusive. In every case, they detail the + lowest class recovery that MAY be attempted. The implementer is left + to decide under which circumstances to escalate to the next recovery + class and/or what recovery classes to implement. Both the iSCSI + target and initiator MAY escalate the error handling to an error + recovery class, which impacts a larger number of iSCSI tasks in any + of the cases identified in the following discussion. + + In all classes, the implementer has the choice of deferring errors to + the SCSI initiator (with an appropriate response code), in which case + the task, if any, has to be removed from the target and all the side + effects, such as ACA, must be considered. + + Use of within-connection and within-command recovery classes MUST NOT + be attempted before the connection is in Full Feature Phase. + + In the detailed description of the recovery classes, the mandating + terms (MUST, SHOULD, MAY, etc.) indicate normative actions to be + executed if the recovery class is supported and used. + +6.1.4.1. Recovery Within-command + + At the target, the following cases lend themselves to + within-command recovery: + + - Lost data PDU - realized through one of the following: + + a) Data digest error - dealt with as specified in Section 6.7 + Digest Errors, using the option of a recovery R2T. + + + + + + +Satran, et al. Standards Track [Page 69] + +RFC 3720 iSCSI April 2004 + + + b) Sequence reception timeout (no data or + partial-data-and-no-F-bit) - considered an implicit sequence + error and dealt with as specified in Section 6.8 Sequence + Errors, using the option of a recovery R2T. + c) Header digest error, which manifests as a sequence reception + timeout or a sequence error - dealt with as specified in + Section 6.8 Sequence Errors, using the option of a recovery + R2T. + + At the initiator, the following cases lend themselves to + within-command recovery: + + Lost data PDU or lost R2T - realized through one of the + following: + + a) Data digest error - dealt with as specified in Section 6.7 + Digest Errors, using the option of a SNACK. + b) Sequence reception timeout (no status) or response reception + timeout - dealt with as specified in Section 6.8 Sequence + Errors, using the option of a SNACK. + c) Header digest error, which manifests as a sequence reception + timeout or a sequence error - dealt with as specified in + Section 6.8 Sequence Errors, using the option of a SNACK. + + To avoid a race with the target, which may already have a recovery + R2T or a termination response on its way, an initiator SHOULD NOT + originate a SNACK for an R2T based on its internal timeouts (if any). + Recovery in this case is better left to the target. + + The timeout values used by the initiator and target are outside the + scope of this document. Sequence reception timeout is generally a + large enough value to allow the data sequence transfer to be + complete. + +6.1.4.2. Recovery Within-connection + + At the initiator, the following cases lend themselves to + within-connection recovery: + + - Requests not acknowledged for a long time. Requests are + acknowledged explicitly through ExpCmdSN or implicitly by + receiving data and/or status. The initiator MAY retry + non-acknowledged commands as specified in Section 6.2 Retry and + Reassign in Recovery. + + + + + + + +Satran, et al. Standards Track [Page 70] + +RFC 3720 iSCSI April 2004 + + + - Lost iSCSI numbered Response. It is recognized by either + identifying a data digest error on a Response PDU or a Data-In + PDU carrying the status, or by receiving a Response PDU with a + higher StatSN than expected. In the first case, digest error + handling is done as specified in Section 6.7 Digest Errors using + the option of a SNACK. In the second case, sequence error + handling is done as specified in Section 6.8 Sequence Errors, + using the option of a SNACK. + + At the target, the following cases lend themselves to + within-connection recovery: + + - Status/Response not acknowledged for a long time. The target MAY + issue a NOP-IN (with a valid Target Transfer Tag or otherwise) + that carries the next status sequence number it is going to use + in the StatSN field. This helps the initiator detect any missing + StatSN(s) and issue a SNACK for the status. + + The timeout values used by the initiator and the target are outside + the scope of this document. + +6.1.4.3. Connection Recovery + + At an iSCSI initiator, the following cases lend themselves to + connection recovery: + + - TCP connection failure: The initiator MUST close the connection. + It then MUST either implicitly or explicitly logout the failed + connection with the reason code "remove the connection for + recovery" and reassign connection allegiance for all commands + still in progress associated with the failed connection on one or + more connections (some or all of which MAY be newly established + connections) using the "Task reassign" task management function + (see Section 10.5.1 Function). For an initiator, a command is in + progress as long as it has not received a response or a Data-In + PDU including status. + + Note: The logout function is mandatory. However, a new connection + establishment is only mandatory if the failed connection was the + last or only connection in the session. + + - Receiving an Asynchronous Message that indicates one or all + connections in a session has been dropped. The initiator MUST + handle it as a TCP connection failure for the connection(s) + referred to in the Message. + + + + + + +Satran, et al. Standards Track [Page 71] + +RFC 3720 iSCSI April 2004 + + + At an iSCSI target, the following cases lend themselves to connection + recovery: + + - TCP connection failure. The target MUST close the connection and, + if more than one connection is available, the target SHOULD send + an Asynchronous Message that indicates it has dropped the + connection. Then, the target will wait for the initiator to + continue recovery. + +6.1.4.4. Session Recovery + + Session recovery should be performed when all other recovery attempts + have failed. Very simple initiators and targets MAY perform session + recovery on all iSCSI errors and rely on recovery on the SCSI layer + and above. + + Session recovery implies the closing of all TCP connections, + internally aborting all executing and queued tasks for the given + initiator at the target, terminating all outstanding SCSI commands + with an appropriate SCSI service response at the initiator, and + restarting a session on a new set of connection(s) (TCP connection + establishment and login on all new connections). + + For possible clearing effects of session recovery on SCSI and iSCSI + objects, refer to Appendix F. - Clearing Effects of Various Events on + Targets -. + +6.1.5. Error Recovery Hierarchy + + The error recovery classes described so far are organized into a + hierarchy for ease in understanding and to limit the implementation + complexity. With few and well defined recovery levels + interoperability is easier to achieve. The attributes of this + hierarchy are as follows: + + a) Each level is a superset of the capabilities of the previous + level. For example, Level 1 support implies supporting all + capabilities of Level 0 and more. + b) As a corollary, supporting a higher error recovery level means + increased sophistication and possibly an increase in resource + requirements. + c) Supporting error recovery level "n" is advertised and + negotiated by each iSCSI entity by exchanging the text key + "ErrorRecoveryLevel=n". The lower of the two exchanged values + is the operational ErrorRecoveryLevel for the session. + + + + + + +Satran, et al. Standards Track [Page 72] + +RFC 3720 iSCSI April 2004 + + + The following diagram represents the error recovery hierarchy. + + + + / + / 2 \ <-- Connection recovery + +-----+ + / 1 \ <-- Digest failure recovery + +---------+ + / 0 \ <-- Session failure recovery + +-------------+ + + The following table lists the error recovery capabilities expected + from the implementations that support each error recovery level. + + +-------------------+--------------------------------------------+ + |ErrorRecoveryLevel | Associated Error recovery capabilities | + +-------------------+--------------------------------------------+ + | 0 | Session recovery class | + | | (Section 6.1.4.4 Session Recovery) | + +-------------------+--------------------------------------------+ + | 1 | Digest failure recovery (See Note below.) | + | | plus the capabilities of ER Level 0 | + +-------------------+--------------------------------------------+ + | 2 | Connection recovery class | + | | (Section 6.1.4.3 Connection Recovery) | + | | plus the capabilities of ER Level 1 | + +-------------------+--------------------------------------------+ + + Note: Digest failure recovery is comprised of two recovery classes: + Within-Connection recovery class (Section 6.1.4.2 Recovery Within- + connection) and Within-Command recovery class (Section 6.1.4.1 + Recovery Within-command). + + When a defined value of ErrorRecoveryLevel is proposed by an + originator in a text negotiation, the originator MUST support the + functionality defined for the proposed value and additionally, the + functionality corresponding to any defined value numerically less + than the proposed. When a defined value of ErrorRecoveryLevel is + returned by a responder in a text negotiation, the responder MUST + support the functionality corresponding to the ErrorRecoveryLevel it + is accepting. + + When either party attempts to use error recovery functionality beyond + what is negotiated, the recovery attempts MAY fail unless an a priori + agreement outside the scope of this document exists between the two + parties to provide such support. + + + + + +Satran, et al. Standards Track [Page 73] + +RFC 3720 iSCSI April 2004 + + + Implementations MUST support error recovery level "0", while the rest + are OPTIONAL to implement. In implementation terms, the above + striation means that the following incremental sophistication with + each level is required. + + +-------------------+---------------------------------------------+ + |Level transition | Incremental requirement | + +-------------------+---------------------------------------------+ + | 0->1 | PDU retransmissions on the same connection | + +-------------------+---------------------------------------------+ + | 1->2 | Retransmission across connections and | + | | allegiance reassignment | + +-------------------+---------------------------------------------+ + +6.2. Retry and Reassign in Recovery + + This section summarizes two important and somewhat related iSCSI + protocol features used in error recovery. + +6.2.1. Usage of Retry + + By resending the same iSCSI command PDU ("retry") in the absence of a + command acknowledgement (by way of an ExpCmdSN update) or a response, + an initiator attempts to "plug" (what it thinks are) the + discontinuities in CmdSN ordering on the target end. Discarded + command PDUs, due to digest errors, may have created these + discontinuities. + + Retry MUST NOT be used for reasons other than plugging command + sequence gaps, and in particular, cannot be used for requesting PDU + retransmissions from a target. Any such PDU retransmission requests + for a currently allegiant command in progress may be made using the + SNACK mechanism described in section 10.16, although the usage of + SNACK is OPTIONAL. + + If initiators, as part of plugging command sequence gaps as described + above, inadvertently issue retries for allegiant commands already in + progress (i.e., targets did not see the discontinuities in CmdSN + ordering), the duplicate commands are silently ignored by targets as + specified in section 3.2.2.1. + + When an iSCSI command is retried, the command PDU MUST carry the + original Initiator Task Tag and the original operational attributes + (e.g., flags, function names, LUN, CDB etc.) as well as the original + CmdSN. The command being retried MUST be sent on the same connection + as the original command unless the original connection was already + successfully logged out. + + + + +Satran, et al. Standards Track [Page 74] + +RFC 3720 iSCSI April 2004 + + +6.2.2. Allegiance Reassignment + + By issuing a "task reassign" task management request (Section 10.5.1 + Function), the initiator signals its intent to continue an already + active command (but with no current connection allegiance) as part of + connection recovery. This means that a new connection allegiance is + requested for the command, which seeks to associate it to the + connection on which the task management request is being issued. + Before the allegiance reassignment is attempted for a task, an + implicit or explicit Logout with the reason code "remove the + connection for recovery" ( see section 10.14) MUST be successfully + completed for the previous connection to which the task was + allegiant. + + In reassigning connection allegiance for a command, the targets + SHOULD continue the command from its current state. For example, + when reassigning read commands, the target SHOULD take advantage of + the ExpDataSN field provided by the Task Management function request + (which must be set to zero if there was no data transfer) and bring + the read command to completion by sending the remaining data and + sending (or resending) the status. ExpDataSN acknowledges all data + sent up to, but not including, the Data-In PDU and or R2T with DataSN + (or R2TSN) equal to ExpDataSN. However, targets may choose to + send/receive all unacknowledged data or all of the data on a + reassignment of connection allegiance if unable to recover or + maintain an accurate state. Initiators MUST not subsequently request + data retransmission through Data SNACK for PDUs numbered less than + ExpDataSN (i.e., prior to the acknowledged sequence number). For all + types of commands, a reassignment request implies that the task is + still considered in progress by the initiator and the target must + conclude the task appropriately if the target returns the "Function + Complete" response to the reassignment request. This might possibly + involve retransmission of data/R2T/status PDUs as necessary, but MUST + involve the (re)transmission of the status PDU. + + It is OPTIONAL for targets to support the allegiance reassignment. + This capability is negotiated via the ErrorRecoveryLevel text key + during the login time. When a target does not support allegiance + reassignment, it MUST respond with a Task Management response code of + "Allegiance reassignment not supported". If allegiance reassignment + is supported by the target, but the task is still allegiant to a + different connection, or a successful recovery Logout of the + previously allegiant connection was not performed, the target MUST + respond with a Task Management response code of "Task still + allegiant". + + + + + + +Satran, et al. Standards Track [Page 75] + +RFC 3720 iSCSI April 2004 + + + If allegiance reassignment is supported by the target, the Task + Management response to the reassignment request MUST be issued before + the reassignment becomes effective. + + If a SCSI Command that involves data input is reassigned, any SNACK + Tag it holds for a final response from the original connection is + deleted and the default value of 0 MUST be used instead. + +6.3. Usage Of Reject PDU in Recovery + + Targets MUST NOT implicitly terminate an active task by sending a + Reject PDU for any PDU exchanged during the life of the task. If the + target decides to terminate the task, a Response PDU (SCSI, Text, + Task, etc.) must be returned by the target to conclude the task. If + the task had never been active before the Reject (i.e., the Reject is + on the command PDU), targets should not send any further responses + because the command itself is being discarded. + + The above rule means that the initiator can eventually expect a + response on receiving Rejects, if the received Reject is for a PDU + other than the command PDU itself. The non-command Rejects only have + diagnostic value in logging the errors, and they can be used for + retransmission decisions by the initiators. + + The CmdSN of the rejected command PDU (if it is a non-immediate + command) MUST NOT be considered received by the target (i.e., a + command sequence gap must be assumed for the CmdSN), even though the + CmdSN of the rejected command PDU may be reliably ascertained. Upon + receiving the Reject, the initiator MUST plug the CmdSN gap in order + to continue to use the session. The gap may be plugged either by + transmitting a command PDU with the same CmdSN, or by aborting the + task (see section 6.9 on how an abort may plug a CmdSN gap). + + When a data PDU is rejected and its DataSN can be ascertained, a + target MUST advance ExpDataSN for the current data burst if a + recovery R2T is being generated. The target MAY advance its + ExpDataSN if it does not attempt to recover the lost data PDU. + +6.4. Connection Timeout Management + + iSCSI defines two session-global timeout values (in seconds) + - Time2Wait and Time2Retain - that are applicable when an iSCSI Full + Feature Phase connection is taken out of service either intentionally + or by an exception. Time2Wait is the initial "respite time" before + attempting an explicit/implicit Logout for the CID in question or + task reassignment for the affected tasks (if any). Time2Retain is + the maximum time after the initial respite interval that the task + and/or connection state(s) is/are guaranteed to be maintained on the + + + +Satran, et al. Standards Track [Page 76] + +RFC 3720 iSCSI April 2004 + + + target to cater to a possible recovery attempt. Recovery attempts + for the connection and/or task(s) SHOULD NOT be made before Time2Wait + seconds, but MUST be completed within Time2Retain seconds after that + initial Time2Wait waiting period. + +6.4.1. Timeouts on Transport Exception Events + + A transport connection shutdown or a transport reset without any + preceding iSCSI protocol interactions informing the end-points of the + fact causes a Full Feature Phase iSCSI connection to be abruptly + terminated. The timeout values to be used in this case are the + negotiated values of defaultTime2Wait (Section 12.15 + DefaultTime2Wait) and DefaultTime2Retain (Section 12.16 + DefaultTime2Retain) text keys for the session. + +6.4.2. Timeouts on Planned Decommissioning + + Any planned decommissioning of a Full Feature Phase iSCSI connection + is preceded by either a Logout Response PDU, or an Async Message PDU. + The Time2Wait and Time2Retain field values (section 10.15) in a + Logout Response PDU, and the Parameter2 and Parameter3 fields of an + Async Message (AsyncEvent types "drop the connection" or "drop all + the connections"; section 10.9.1) specify the timeout values to be + used in each of these cases. + + These timeout values are only applicable for the affected connection, + and the tasks active on that connection. These timeout values have + no bearing on initiator timers (if any) that are already running on + connections or tasks associated with that session. + +6.5. Implicit Termination of Tasks + + A target implicitly terminates the active tasks due to iSCSI protocol + dynamics in the following cases: + + a) When a connection is implicitly or explicitly logged out with + the reason code of "Close the connection" and there are active + tasks allegiant to that connection. + + b) When a connection fails and the connection state eventually + times out (state transition M1 in Section 7.2.2 State + Transition Descriptions for Initiators and Targets) and there + are active tasks allegiant to that connection. + + c) When a successful Logout with the reason code of "remove the + connection for recovery" is performed while there are active + tasks allegiant to that connection, and those tasks eventually + + + + +Satran, et al. Standards Track [Page 77] + +RFC 3720 iSCSI April 2004 + + + time out after the Time2Wait and Time2Retain periods without + allegiance reassignment. + + d) When a connection is implicitly or explicitly logged out with + the reason code of "Close the session" and there are active + tasks in that session. + + If the tasks terminated in the above cases a), b, c) and d)are SCSI + tasks, they must be internally terminated as if with CHECK CONDITION + status. This status is only meaningful for appropriately handling + the internal SCSI state and SCSI side effects with respect to + ordering because this status is never communicated back as a + terminating status to the initiator. However additional actions may + have to be taken at SCSI level depending on the SCSI context as + defined by the SCSI standards (e.g., queued commands and ACA, in + cases a), b), and c), after the tasks are terminated, the target MUST + report a Unit Attention condition on the next command processed on + any connection for each affected I_T_L nexus with the status of CHECK + CONDITION, and the ASC/ASCQ value of 47h/7Fh - "SOME COMMANDS CLEARED + BY ISCSI PROTOCOL EVENT" , etc. - see [SAM2] and [SPC3]). + +6.6. Format Errors + + The following two explicit violations of PDU layout rules are format + errors: + + a) Illegal contents of any PDU header field except the Opcode + (legal values are specified in Section 10 iSCSI PDU Formats). + b) Inconsistent field contents (consistent field contents are + specified in Section 10 iSCSI PDU Formats). + + Format errors indicate a major implementation flaw in one of the + parties. + + When a target or an initiator receives an iSCSI PDU with a format + error, it MUST immediately terminate all transport connections in the + session either with a connection close or with a connection reset and + escalate the format error to session recovery (see Section 6.1.4.4 + Session Recovery). + +6.7. Digest Errors + + The discussion of the legal choices in handling digest errors below + excludes session recovery as an explicit option, but either party + detecting a digest error may choose to escalate the error to session + recovery. + + + + + +Satran, et al. Standards Track [Page 78] + +RFC 3720 iSCSI April 2004 + + + When a target or an initiator receives any iSCSI PDU, with a header + digest error, it MUST either discard the header and all data up to + the beginning of a later PDU or close the connection. Because the + digest error indicates that the length field of the header may have + been corrupted, the location of the beginning of a later PDU needs to + be reliably ascertained by other means such as the operation of a + sync and steering layer. + + When a target receives any iSCSI PDU with a payload digest error, it + MUST answer with a Reject PDU with a reason code of + Data-Digest-Error and discard the PDU. + + - If the discarded PDU is a solicited or unsolicited iSCSI data + PDU (for immediate data in a command PDU, non-data PDU rule + below applies), the target MUST do one of the following: + a) Request retransmission with a recovery R2T. + b) Terminate the task with a response PDU with a CHECK + CONDITION Status and an iSCSI Condition of "protocol service + CRC error" (Section 10.4.7.2 Sense Data). If the target + chooses to implement this option, it MUST wait to receive + all the data (signaled by a Data PDU with the final bit set + for all outstanding R2Ts) before sending the response PDU. + A task management command (such as an abort task) from the + initiator during this wait may also conclude the task. + - No further action is necessary for targets if the discarded PDU + is a non-data PDU. In case of immediate data being present on + a discarded command, the immediate data is implicitly recovered + when the task is retried (see section 6.2.1), followed by the + entire data transfer for the task. + + When an initiator receives any iSCSI PDU with a payload digest error, + it MUST discard the PDU. + + - If the discarded PDU is an iSCSI data PDU, the initiator MUST do + one of the following: + + a) Request the desired data PDU through SNACK. In response to the + SNACK, the target MUST either resend the data PDU or reject the + SNACK with a Reject PDU with a reason code of "SNACK reject" in + which case: + i) If the status has not already been sent for the command, + the target MUST terminate the command with a CHECK + CONDITION Status and an iSCSI Condition of "SNACK rejected" + (Section 10.4.7.2 Sense Data). + ii) If the status was already sent, no further action is + necessary for the target. The initiator in this case MUST + wait for the status to be received and then discard it, so + as to internally signal the completion with CHECK CONDITION + + + +Satran, et al. Standards Track [Page 79] + +RFC 3720 iSCSI April 2004 + + + Status and an iSCSI Condition of "protocol service CRC + error" (Section 10.4.7.2 Sense Data). + b) Abort the task and terminate the command with an error. + + - If the discarded PDU is a response PDU, the initiator MUST do one + of the following: + + a) Request PDU retransmission with a status SNACK. + b) Logout the connection for recovery and continue the tasks on a + different connection instance as described in Section 6.2 Retry + and Reassign in Recovery. + c) Logout to close the connection (abort all the commands + associated with the connection). + + - No further action is necessary for initiators if the discarded PDU + is an unsolicited PDU (e.g., Async, Reject). Task timeouts as in + the initiator waiting for a command completion, or process + timeouts, as in the target waiting for a Logout, will ensure that + the correct operational behavior will result in these cases + despite the discarded PDU. + +6.8. Sequence Errors + + When an initiator receives an iSCSI R2T/data PDU with an out of order + R2TSN/DataSN or a SCSI response PDU with an ExpDataSN that implies + missing data PDU(s), it means that the initiator must have detected a + header or payload digest error on one or more earlier R2T/data PDUs. + The initiator MUST address these implied digest errors as described + in Section 6.7 Digest Errors. When a target receives a data PDU with + an out of order DataSN, it means that the target must have hit a + header or payload digest error on at least one of the earlier data + PDUs. The target MUST address these implied digest errors as + described in Section 6.7 Digest Errors. + + When an initiator receives an iSCSI status PDU with an out of order + StatSN that implies missing responses, it MUST address the one or + more missing status PDUs as described in Section 6.7 Digest Errors. + As a side effect of receiving the missing responses, the initiator + may discover missing data PDUs. If the initiator wants to recover + the missing data for a command, it MUST NOT acknowledge the received + responses that start from the StatSN of the relevant command, until + it has completed receiving all the data PDUs of the command. + + When an initiator receives duplicate R2TSNs (due to proactive + retransmission of R2Ts by the target) or duplicate DataSNs (due to + proactive SNACKs by the initiator), it MUST discard the duplicates. + + + + + +Satran, et al. Standards Track [Page 80] + +RFC 3720 iSCSI April 2004 + + +6.9. SCSI Timeouts + + An iSCSI initiator MAY attempt to plug a command sequence gap on the + target end (in the absence of an acknowledgement of the command by + way of ExpCmdSN) before the ULP timeout by retrying the + unacknowledged command, as described in Section 6.2 Retry and + Reassign in Recovery. + + On a ULP timeout for a command (that carried a CmdSN of n), if the + iSCSI initiator intends to continue the session, it MUST abort the + command by either using an appropriate Task Management function + request for the specific command, or a "close the connection" Logout. + When using an ABORT TASK, if the ExpCmdSN is still less than (n+1), + the target may see the abort request while missing the original + command itself due to one of the following reasons: + + - Original command was dropped due to digest error. + - Connection on which the original command was sent was + successfully logged out. Upon logout, the unacknowledged + commands issued on the connection being logged out are + discarded. + + If the abort request is received and the original command is missing, + targets MUST consider the original command with that RefCmdSN to be + received and issue a Task Management response with the response code: + "Function Complete". This response concludes the task on both ends. + If the abort request is received and the target can determine (based + on the Referenced Task Tag) that the command was received and + executed and also that the response was sent prior to the abort, then + the target MUST respond with the response code of "Task Does Not + Exist". + +6.10. Negotiation Failures + + Text request and response sequences, when used to set/negotiate + operational parameters, constitute the negotiation/parameter setting. + A negotiation failure is considered to be one or more of the + following: + + - None of the choices, or the stated value, is acceptable to one + of the sides in the negotiation. + - The text request timed out and possibly terminated. + - The text request was answered with a Reject PDU. + + + + + + + + +Satran, et al. Standards Track [Page 81] + +RFC 3720 iSCSI April 2004 + + + The following two rules should be used to address negotiation + failures: + + - During Login, any failure in negotiation MUST be considered a + login process failure and the Login Phase must be terminated, + and with it, the connection. If the target detects the + failure, it must terminate the login with the appropriate Login + Response code. + + - A failure in negotiation, while in the Full Feature Phase, will + terminate the entire negotiation sequence that may consist of a + series of text requests that use the same Initiator Task Tag. + The operational parameters of the session or the connection + MUST continue to be the values agreed upon during an earlier + successful negotiation (i.e., any partial results of this + unsuccessful negotiation MUST NOT take effect and MUST be + discarded). + +6.11. Protocol Errors + + Mapping framed messages over a "stream" connection, such as TCP, + makes the proposed mechanisms vulnerable to simple software framing + errors. On the other hand, the introduction of framing mechanisms to + limit the effects of these errors may be onerous on performance for + simple implementations. Command Sequence Numbers and the above + mechanisms for connection drop and reestablishment help handle this + type of mapping errors. + + All violations of iSCSI PDU exchange sequences specified in this + document are also protocol errors. This category of errors can only + be addressed by fixing the implementations; iSCSI defines Reject and + response codes to enable this. + +6.12. Connection Failures + + iSCSI can keep a session in operation if it is able to + keep/establish at least one TCP connection between the initiator and + the target in a timely fashion. Targets and/or initiators may + recognize a failing connection by either transport level means (TCP), + a gap in the command sequence number, a response stream that is not + filled for a long time, or by a failing iSCSI NOP (acting as a ping). + The latter MAY be used periodically to increase the speed and + likelihood of detecting connection failures. Initiators and targets + MAY also use the keep-alive option on the TCP connection to enable + early link failure detection on otherwise idle links. + + + + + + +Satran, et al. Standards Track [Page 82] + +RFC 3720 iSCSI April 2004 + + + On connection failure, the initiator and target MUST do one of the + following: + + - Attempt connection recovery within the session (Section 6.1.4.3 + Connection Recovery). + + - Logout the connection with the reason code "closes the + connection" (Section 10.14.5 Implicit termination of tasks), + re-issue missing commands, and implicitly terminate all active + commands. This option requires support for the + within-connection recovery class (Section 6.1.4.2 Recovery + Within-connection). + + - Perform session recovery (Section 6.1.4.4 Session Recovery). + + Either side may choose to escalate to session recovery (via the + initiator dropping all the connections, or via an Async Message that + announces the similar intent from a target), and the other side MUST + give it precedence. On a connection failure, a target MUST terminate + and/or discard all of the active immediate commands regardless of + which of the above options is used (i.e., immediate commands are not + recoverable across connection failures). + +6.13. Session Errors + + If all of the connections of a session fail and cannot be + reestablished in a short time, or if initiators detect protocol + errors repeatedly, an initiator may choose to terminate a session and + establish a new session. + + In this case, the initiator takes the following actions: + + - Resets or closes all the transport connections. + - Terminates all outstanding requests with an appropriate + response before initiating a new session. If the same I_T + nexus is intended to be reestablished, the initiator MUST + employ session reinstatement (see section 5.3.5). + + When the session timeout (the connection state timeout for the last + failed connection) happens on the target, it takes the following + actions: + + - Resets or closes the TCP connections (closes the session). + - Terminates all active tasks that were allegiant to the + connection(s) that constituted the session. + + A target MUST also be prepared to handle a session reinstatement + request from the initiator, that may be addressing session errors. + + + +Satran, et al. Standards Track [Page 83] + +RFC 3720 iSCSI April 2004 + + +7. State Transitions + + iSCSI connections and iSCSI sessions go through several well-defined + states from the time they are created to the time they are cleared. + + The connection state transitions are described in two separate but + dependent state diagrams for ease in understanding. The first + diagram, "standard connection state diagram", describes the + connection state transitions when the iSCSI connection is not waiting + for, or undergoing, a cleanup by way of an explicit or implicit + Logout. The second diagram, "connection cleanup state diagram", + describes the connection state transitions while performing the iSCSI + connection cleanup. + + The "session state diagram" describes the state transitions an iSCSI + session would go through during its lifetime, and it depends on the + states of possibly multiple iSCSI connections that participate in the + session. + + States and state transitions are described in the text, tables and + diagrams. The diagrams are used for illustration. The text and the + tables are the governing specification. + +7.1. Standard Connection State Diagrams + +7.1.1. State Descriptions for Initiators and Targets + + State descriptions for the standard connection state diagram are as + follows: + + -S1: FREE + -initiator: State on instantiation, or after successful + connection closure. + -target: State on instantiation, or after successful connection + closure. + -S2: XPT_WAIT + -initiator: Waiting for a response to its transport connection + establishment request. + -target: Illegal + -S3: XPT_UP + -initiator: Illegal + -target: Waiting for the Login process to commence. + -S4: IN_LOGIN + -initiator: Waiting for the Login process to conclude, possibly + involving several PDU exchanges. + -target: Waiting for the Login process to conclude, possibly + involving several PDU exchanges. + + + + +Satran, et al. Standards Track [Page 84] + +RFC 3720 iSCSI April 2004 + + + -S5: LOGGED_IN + -initiator: In Full Feature Phase, waiting for all internal, + iSCSI, and transport events. + -target: In Full Feature Phase, waiting for all internal, iSCSI, + and transport events. + -S6: IN_LOGOUT + -initiator: Waiting for a Logout response. + -target: Waiting for an internal event signaling completion of + logout processing. + -S7: LOGOUT_REQUESTED + -initiator: Waiting for an internal event signaling readiness to + proceed with Logout. + -target: Waiting for the Logout process to start after having + requested a Logout via an Async Message. + -S8: CLEANUP_WAIT + -initiator: Waiting for the context and/or resources to initiate + the cleanup processing for this CSM. + -target: Waiting for the cleanup process to start for this CSM. + +7.1.2. State Transition Descriptions for Initiators and Targets + + -T1: + -initiator: Transport connect request was made (e.g., TCP SYN + sent). + -target: Illegal + -T2: + -initiator: Transport connection request timed out, a transport + reset was received, or an internal event of receiving a + Logout response (success) on another connection for a + "close the session" Logout request was received. + -target:Illegal + -T3: + -initiator: Illegal + -target: Received a valid transport connection request that + establishes the transport connection. + -T4: + -initiator: Transport connection established, thus prompting the + initiator to start the iSCSI Login. + -target: Initial iSCSI Login Request was received. + -T5: + -initiator: The final iSCSI Login Response with a Status-Class + of zero was received. + -target: The final iSCSI Login Request to conclude the Login + Phase was received, thus prompting the target to send the + final iSCSI Login Response with a Status-Class of zero. + + + + + + +Satran, et al. Standards Track [Page 85] + +RFC 3720 iSCSI April 2004 + + + -T6: + -initiator: Illegal + -target: Timed out waiting for an iSCSI Login, transport + disconnect indication was received, transport reset was + received, or an internal event indicating a transport + timeout was received. In all these cases, the connection is + to be closed. + -T7: + -initiator - one of the following events caused the transition: + - The final iSCSI Login Response was received with a + non-zero Status-Class. + - Login timed out. + - A transport disconnect indication was received. + - A transport reset was received. + - An internal event was received indicating a transport + timeout. + - An internal event of receiving a Logout response (success) + on another connection for a "close the session" Logout + request was received. + + In all these cases, the transport connection is closed. + + -target - one of the following events caused the transition: + - The final iSCSI Login Request to conclude the Login Phase + was received, prompting the target to send the final iSCSI + Login Response with a non-zero Status-Class. + - Login timed out. + - Transport disconnect indication was received. + - Transport reset was received. + - An internal event indicating a transport timeout was + received. + - On another connection a "close the session" Logout request + was received. + In all these cases, the connection is to be closed. + -T8: + -initiator: An internal event of receiving a Logout response + (success) on another connection for a "close the session" + Logout request was received, thus closing this connection + requiring no further cleanup. + -target: An internal event of sending a Logout response + (success) on another connection for a "close the session" + Logout request was received, or an internal event of a + successful connection/session reinstatement is received, + thus prompting the target to close this connection cleanly. + + + + + + + +Satran, et al. Standards Track [Page 86] + +RFC 3720 iSCSI April 2004 + + + -T9, T10: + -initiator: An internal event that indicates the readiness to + start the Logout process was received, thus prompting an + iSCSI Logout to be sent by the initiator. + -target: An iSCSI Logout request was received. + -T11, T12: + -initiator: Async PDU with AsyncEvent "Request Logout" was + received. + -target: An internal event that requires the decommissioning of + the connection is received, thus causing an Async PDU with + an AsyncEvent "Request Logout" to be sent. + -T13: + -initiator: An iSCSI Logout response (success) was received, or + an internal event of receiving a Logout response (success) + on another connection for a "close the session" Logout + request was received. + -target: An internal event was received that indicates + successful processing of the Logout, which prompts an iSCSI + Logout response (success) to be sent; an internal event of + sending a Logout response (success) on another connection + for a "close the session" Logout request was received; or an + internal event of a successful connection/session + reinstatement is received. In all these cases, the + transport connection is closed. + + -T14: + -initiator: Async PDU with AsyncEvent "Request Logout" was + received again. + -target: Illegal + -T15, T16: + -initiator: One or more of the following events caused this + transition: + -Internal event that indicates a transport connection + timeout was received thus prompting transport RESET or + transport connection closure. + -A transport RESET. + -A transport disconnect indication. + -Async PDU with AsyncEvent "Drop connection" (for this CID). + -Async PDU with AsyncEvent "Drop all connections". + -target: One or more of the following events caused this + transition: + -Internal event that indicates a transport connection + timeout was received, thus prompting transport RESET or + transport connection closure. + -An internal event of a failed connection/session + reinstatement is received. + -A transport RESET. + -A transport disconnect indication. + + + +Satran, et al. Standards Track [Page 87] + +RFC 3720 iSCSI April 2004 + + + -Internal emergency cleanup event was received which prompts + an Async PDU with AsyncEvent "Drop connection" (for this + CID), or event "Drop all connections". + -T17: + -initiator: One or more of the following events caused this + transition: + -Logout response, (failure i.e., a non-zero status) was + received, or Logout timed out. + -Any of the events specified for T15 and T16. + -target: One or more of the following events caused this + transition: + -Internal event that indicates a failure of the Logout + processing was received, which prompts a Logout response + (failure, i.e., a non-zero status) to be sent. + -Any of the events specified for T15 and T16. + -T18: + -initiator: An internal event of receiving a Logout response + (success) on another connection for a "close the session" + Logout request was received. + -target: An internal event of sending a Logout response + (success) on another connection for a "close the session" + Logout request was received, or an internal event of a + successful connection/session reinstatement is received. In + both these cases, the connection is closed. + + The CLEANUP_WAIT state (S8) implies that there are possible iSCSI + tasks that have not reached conclusion and are still considered busy. + +7.1.3. Standard Connection State Diagram for an Initiator + + Symbolic names for States: + + S1: FREE + S2: XPT_WAIT + S4: IN_LOGIN + S5: LOGGED_IN + S6: IN_LOGOUT + S7: LOGOUT_REQUESTED + S8: CLEANUP_WAIT + + + + + + + + + + + + +Satran, et al. Standards Track [Page 88] + +RFC 3720 iSCSI April 2004 + + + States S5, S6, and S7 constitute the Full Feature Phase operation of + the connection. + + The state diagram is as follows: + + -------<-------------+ + +--------->/ S1 \<----+ | + T13| +->\ /<-+ \ | + | / ---+--- \ \ | + | / | T2 \ | | + | T8 | |T1 | | | + | | | / |T7 | + | | | / | | + | | | / | | + | | V / / | + | | ------- / / | + | | / S2 \ / | + | | \ / / | + | | ---+--- / | + | | |T4 / | + | | V / | T18 + | | ------- / | + | | / S4 \ | + | | \ / | + | | ---+--- | T15 + | | |T5 +--------+---------+ + | | | /T16+-----+------+ | + | | | / -+-----+--+ | | + | | | / / S7 \ |T12| | + | | | / +->\ /<-+ V V + | | | / / -+----- ------- + | | | / /T11 |T10 / S8 \ + | | V / / V +----+ \ / + | | ---+-+- ----+-- | ------- + | | / S5 \T9 / S6 \<+ ^ + | +-----\ /--->\ / T14 | + | ------- --+----+------+T17 + +---------------------------+ + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 89] + +RFC 3720 iSCSI April 2004 + + + The following state transition table represents the above diagram. + Each row represents the starting state for a given transition, which + after taking a transition marked in a table cell would end in the + state represented by the column of the cell. For example, from state + S1, the connection takes the T1 transition to arrive at state S2. + The fields marked "-" correspond to undefined transitions. + + +----+---+---+---+---+----+---+ + |S1 |S2 |S4 |S5 |S6 |S7 |S8 | + ---+----+---+---+---+---+----+---+ + S1| - |T1 | - | - | - | - | - | + ---+----+---+---+---+---+----+---+ + S2|T2 |- |T4 | - | - | - | - | + ---+----+---+---+---+---+----+---+ + S4|T7 |- |- |T5 | - | - | - | + ---+----+---+---+---+---+----+---+ + S5|T8 |- |- | - |T9 |T11 |T15| + ---+----+---+---+---+---+----+---+ + S6|T13 |- |- | - |T14|- |T17| + ---+----+---+---+---+---+----+---+ + S7|T18 |- |- | - |T10|T12 |T16| + ---+----+---+---+---+---+----+---+ + S8| - |- |- | - | - | - | - | + ---+----+---+---+---+---+----+---+ + +7.1.4. Standard Connection State Diagram for a Target + + Symbolic names for States: + + S1: FREE + S3: XPT_UP + S4: IN_LOGIN + S5: LOGGED_IN + S6: IN_LOGOUT + S7: LOGOUT_REQUESTED + S8: CLEANUP_WAIT + + States S5, S6, and S7 constitute the Full Feature Phase operation of + the connection. + + + + + + + + + + + + +Satran, et al. Standards Track [Page 90] + +RFC 3720 iSCSI April 2004 + + + The state diagram is as follows: + + -------<-------------+ + +--------->/ S1 \<----+ | + T13| +->\ /<-+ \ | + | / ---+--- \ \ | + | / | T6 \ | | + | T8 | |T3 | | | + | | | / |T7 | + | | | / | | + | | | / | | + | | V / / | + | | ------- / / | + | | / S3 \ / | + | | \ / / | T18 + | | ---+--- / | + | | |T4 / | + | | V / | + | | ------- / | + | | / S4 \ | + | | \ / | + | | ---+--- T15 | + | | |T5 +--------+---------+ + | | | /T16+-----+------+ | + | | | / -+-----+---+ | | + | | | / / S7 \ |T12| | + | | | / +->\ /<-+ V V + | | | / / -+----- ------- + | | | / /T11 |T10 / S8 \ + | | V / / V \ / + | | ---+-+- ------- ------- + | | / S5 \T9 / S6 \ ^ + | +-----\ /--->\ / | + | ------- --+----+--------+T17 + +---------------------------+ + + The following state transition table represents the above diagram, + and follows the conventions described for the initiator diagram. + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 91] + +RFC 3720 iSCSI April 2004 + + + +----+---+---+---+---+----+---+ + |S1 |S3 |S4 |S5 |S6 |S7 |S8 | + ---+----+---+---+---+---+----+---+ + S1| - |T3 | - | - | - | - | - | + ---+----+---+---+---+---+----+---+ + S3|T6 |- |T4 | - | - | - | - | + ---+----+---+---+---+---+----+---+ + S4|T7 |- |- |T5 | - | - | - | + ---+----+---+---+---+---+----+---+ + S5|T8 |- |- | - |T9 |T11 |T15| + ---+----+---+---+---+---+----+---+ + S6|T13 |- |- | - |- |- |T17| + ---+----+---+---+---+---+----+---+ + S7|T18 |- |- | - |T10|T12 |T16| + ---+----+---+---+---+---+----+---+ + S8| - |- |- | - | - | - | - | + ---+----+---+---+---+---+----+---+ + +7.2. Connection Cleanup State Diagram for Initiators and Targets + + Symbolic names for states: + + R1: CLEANUP_WAIT (same as S8) + R2: IN_CLEANUP + R3: FREE (same as S1) + + Whenever a connection state machine (e.g., CSM-C) enters the + CLEANUP_WAIT state (S8), it must go through the state transitions + described in the connection cleanup state diagram either a) using a + separate full-feature phase connection (let's call it CSM-E) in the + LOGGED_IN state in the same session, or b) using a new transport + connection (let's call it CSM-I) in the FREE state that is to be + added to the same session. In the CSM-E case, an explicit logout for + the CID that corresponds to CSM-C (either as a connection or session + logout) needs to be performed to complete the cleanup. In the CSM-I + case, an implicit logout for the CID that corresponds to CSM-C needs + to be performed by way of connection reinstatement (section 5.3.4) + for that CID. In either case, the protocol exchanges on CSM-E or + CSM-I determine the state transitions for CSM-C. Therefore, this + cleanup state diagram is only applicable to the instance of the + connection in cleanup (i.e., CSM-C). In the case of an implicit + logout for example, CSM-C reaches FREE (R3) at the time CSM-I reaches + LOGGED_IN. In the case of an explicit logout, CSM-C reaches FREE + (R3) when CSM-E receives a successful logout response while + continuing to be in the LOGGED_IN state. + + + + + + +Satran, et al. Standards Track [Page 92] + +RFC 3720 iSCSI April 2004 + + + An initiator must initiate an explicit or implicit connection logout + for a connection in the CLEANUP_WAIT state, if the initiator intends + to continue using the associated iSCSI session. + + The following state diagram applies to both initiators and targets. + + ------- + / R1 \ + +--\ /<-+ + / ---+--- + / | \ M3 + M1 | |M2 | + | | / + | | / + | | / + | V / + | ------- / + | / R2 \ + | \ / + | ------- + | | + | |M4 + | | + | | + | | + | V + | ------- + | / R3 \ + +---->\ / + ------- + + The following state transition table represents the above diagram, + and follows the same conventions as in earlier sections. + + +----+----+----+ + |R1 |R2 |R3 | + -----+----+----+----+ + R1 | - |M2 |M1 | + -----+----+----+----+ + R2 |M3 | - |M4 | + -----+----+----+----+ + R3 | - | - | - | + -----+----+----+----+ + + + + + + + + +Satran, et al. Standards Track [Page 93] + +RFC 3720 iSCSI April 2004 + + +7.2.1. State Descriptions for Initiators and Targets + + -R1: CLEANUP_WAIT (Same as S8) + -initiator: Waiting for the internal event to initiate the + cleanup processing for CSM-C. + -target: Waiting for the cleanup process to start for CSM-C. + -R2: IN_CLEANUP + -initiator: Waiting for the connection cleanup process to + conclude for CSM-C. + -target: Waiting for the connection cleanup process to conclude + for CSM-C. + -R3: FREE (Same as S1) + -initiator: End state for CSM-C. + -target: End state for CSM-C. + +7.2.2. State Transition Descriptions for Initiators and Targets + + -M1: One or more of the following events was received: + -initiator: + -An internal event that indicates connection state timeout. + -An internal event of receiving a successful Logout response + on a different connection for a "close the session" + Logout. + -target: + -An internal event that indicates connection state timeout. + -An internal event of sending a Logout response (success) on + a different connection for a "close the session" Logout + request. + + -M2: An implicit/explicit logout process was initiated by the + initiator. + -In CSM-I usage: + -initiator: An internal event requesting the connection (or + session) reinstatement was received, thus prompting a + connection (or session) reinstatement Login to be sent + transitioning CSM-I to state IN_LOGIN. + -target: A connection/session reinstatement Login was + received while in state XPT_UP. + -In CSM-E usage: + -initiator: An internal event that indicates that an + explicit logout was sent for this CID in state LOGGED_IN. + -target: An explicit logout was received for this CID in + state LOGGED_IN. + + + + + + + + +Satran, et al. Standards Track [Page 94] + +RFC 3720 iSCSI April 2004 + + + -M3: Logout failure detected + -In CSM-I usage: + -initiator: CSM-I failed to reach LOGGED_IN and arrived into + FREE instead. + -target: CSM-I failed to reach LOGGED_IN and arrived into + FREE instead. + -In CSM-E usage: + -initiator: CSM-E either moved out of LOGGED_IN, or Logout + timed out and/or aborted, or Logout response (failure) + was received. + -target: CSM-E either moved out of LOGGED_IN, Logout timed + out and/or aborted, or an internal event that indicates a + failed Logout processing was received. A Logout response + (failure) was sent in the last case. + + -M4: Successful implicit/explicit logout was performed. + + - In CSM-I usage: + -initiator: CSM-I reached state LOGGED_IN, or an internal + event of receiving a Logout response (success) on another + connection for a "close the session" Logout request was + received. + -target: CSM-I reached state LOGGED_IN, or an internal event + of sending a Logout response (success) on a different + connection for a "close the session" Logout request was + received. + - In CSM-E usage: + -initiator: CSM-E stayed in LOGGED_IN and received a Logout + response (success), or an internal event of receiving a + Logout response (success) on another connection for a + "close the session" Logout request was received. + -target: CSM-E stayed in LOGGED_IN and an internal event + indicating a successful Logout processing was received, + or an internal event of sending a Logout response + (success) on a different connection for a "close the + session" Logout request was received. + +7.3. Session State Diagrams + +7.3.1. Session State Diagram for an Initiator + + Symbolic Names for States: + + Q1: FREE + Q3: LOGGED_IN + Q4: FAILED + + State Q3 represents the Full Feature Phase operation of the session. + + + +Satran, et al. Standards Track [Page 95] + +RFC 3720 iSCSI April 2004 + + + The state diagram is as follows: + + ------- + / Q1 \ + +------>\ /<-+ + / ---+--- | + / | |N3 + N6 | |N1 | + | | | + | N4 | | + | +--------+ | / + | | | | / + | | | | / + | | V V / + -+--+-- -----+- + / Q4 \ N5 / Q3 \ + \ /<---\ / + ------- ------- + + The state transition table is as follows: + + +----+----+----+ + |Q1 |Q3 |Q4 | + -----+----+----+----+ + Q1 | - |N1 | - | + -----+----+----+----+ + Q3 |N3 | - |N5 | + -----+----+----+----+ + Q4 |N6 |N4 | - | + -----+----+----+----+ + +7.3.2. Session State Diagram for a Target + + Symbolic Names for States: + + Q1: FREE + Q2: ACTIVE + Q3: LOGGED_IN + Q4: FAILED + Q5: IN_CONTINUE + + State Q3 represents the Full Feature Phase operation of the session. + + + + + + + + + +Satran, et al. Standards Track [Page 96] + +RFC 3720 iSCSI April 2004 + + + The state diagram is as follows: + + ------- + +------------------>/ Q1 \ + / +-------------->\ /<-+ + | | ---+--- | + | | ^ | |N3 + N6 | |N11 N9| V N1 | + | | +------ | + | | / Q2 \ | + | | \ / | + | --+---- +--+--- | + | / Q5 \ | | + | \ / N10 | | + | +-+---+------------+ |N2 / + | ^ | | | / + |N7| |N8 | | / + | | | | V / + -+--+-V V----+- + / Q4 \ N5 / Q3 \ + \ /<-------------\ / + ------- ------- + + The state transition table is as follows: + + +----+----+----+----+----+ + |Q1 |Q2 |Q3 |Q4 |Q5 | + -----+----+----+----+----+----+ + Q1 | - |N1 | - | - | - | + -----+----+----+----+----+----+ + Q2 |N9 | - |N2 | - | - | + -----+----+----+----+----+----+ + Q3 |N3 | - | - |N5 | - | + -----+----+----+----+----+----+ + Q4 |N6 | - | - | - |N7 | + -----+----+----+----+----+----+ + Q5 |N11 | - |N10 |N8 | - | + -----+----+----+----+----+----+ + +7.3.3. State Descriptions for Initiators and Targets + + -Q1: FREE + -initiator: State on instantiation or after cleanup. + -target: State on instantiation or after cleanup. + + + + + + + +Satran, et al. Standards Track [Page 97] + +RFC 3720 iSCSI April 2004 + + + -Q2: ACTIVE + -initiator: Illegal. + -target: The first iSCSI connection in the session transitioned + to IN_LOGIN, waiting for it to complete the login process. + + -Q3: LOGGED_IN + -initiator: Waiting for all session events. + -target: Waiting for all session events. + + -Q4: FAILED + -initiator: Waiting for session recovery or session + continuation. + -target: Waiting for session recovery or session continuation. + + -Q5: IN_CONTINUE + -initiator: Illegal. + -target: Waiting for session continuation attempt to reach a + conclusion. + +7.3.4. State Transition Descriptions for Initiators and Targets + + -N1: + -initiator: At least one transport connection reached the + LOGGED_IN state. + -target: The first iSCSI connection in the session had reached + the IN_LOGIN state. + + -N2: + -initiator: Illegal. + -target: At least one iSCSI connection reached the LOGGED_IN + state. + + -N3: + -initiator: Graceful closing of the session via session closure + (Section 5.3.6 Session Continuation and Failure). + -target: Graceful closing of the session via session closure + (Section 5.3.6 Session Continuation and Failure) or a + successful session reinstatement cleanly closed the session. + + -N4: + -initiator: A session continuation attempt succeeded. + -target: Illegal. + + -N5: + -initiator: Session failure (Section 5.3.6 Session Continuation + and Failure) occurred. + -target: Session failure (Section 5.3.6 Session Continuation and + Failure) occurred. + + + +Satran, et al. Standards Track [Page 98] + +RFC 3720 iSCSI April 2004 + + + -N6: + -initiator: Session state timeout occurred, or a session + reinstatement cleared this session instance. This results + in the freeing of all associated resources and the session + state is discarded. + -target: Session state timeout occurred, or a session + reinstatement cleared this session instance. This results + in the freeing of all associated resources and the session + state is discarded. + + -N7: + -initiator: Illegal. + -target: A session continuation attempt is initiated. + + -N8: + -initiator: Illegal. + -target: The last session continuation attempt failed. + + -N9: + -initiator: Illegal. + -target: Login attempt on the leading connection failed. + + -N10: + -initiator: Illegal. + -target: A session continuation attempt succeeded. + + -N11: + -initiator: Illegal. + -target: A successful session reinstatement cleanly closed the + session. + +8. Security Considerations + + Historically, native storage systems have not had to consider + security because their environments offered minimal security risks. + That is, these environments consisted of storage devices either + directly attached to hosts or connected via a Storage Area Network + (SAN) distinctly separate from the communications network. The use + of storage protocols, such as SCSI, over IP-networks requires that + security concerns be addressed. iSCSI implementations MUST provide + means of protection against active attacks (e.g., pretending to be + another identity, message insertion, deletion, modification, and + replaying) and passive attacks (e.g., eavesdropping, gaining + advantage by analyzing the data sent over the line). + + + + + + + +Satran, et al. Standards Track [Page 99] + +RFC 3720 iSCSI April 2004 + + + Although technically possible, iSCSI SHOULD NOT be configured without + security. iSCSI configured without security should be confined, in + extreme cases, to closed environments without any security risk. + [RFC3723] specifies the mechanisms that must be used in order to + mitigate risks fully described in that document. + + The following section describes the security mechanisms provided by + an iSCSI implementation. + +8.1. iSCSI Security Mechanisms + + The entities involved in iSCSI security are the initiator, target, + and the IP communication end points. iSCSI scenarios in which + multiple initiators or targets share a single communication end point + are expected. To accommodate such scenarios, iSCSI uses two separate + security mechanisms: In-band authentication between the initiator and + the target at the iSCSI connection level (carried out by exchange of + iSCSI Login PDUs), and packet protection (integrity, authentication, + and confidentiality) by IPsec at the IP level. The two security + mechanisms complement each other. The in-band authentication + provides end-to-end trust (at login time) between the iSCSI initiator + and the target while IPsec provides a secure channel between the IP + communication end points. + + Further details on typical iSCSI scenarios and the relation between + the initiators, targets, and the communication end points can be + found in [RFC3723]. + +8.2. In-band Initiator-Target Authentication + + During login, the target MAY authenticate the initiator and the + initiator MAY authenticate the target. The authentication is + performed on every new iSCSI connection by an exchange of iSCSI Login + PDUs using a negotiated authentication method. + + The authentication method cannot assume an underlying IPsec + protection, because IPsec is optional to use. An attacker should + gain as little advantage as possible by inspecting the authentication + phase PDUs. Therefore, a method using clear text (or equivalent) + passwords is not acceptable; on the other hand, identity protection + is not strictly required. + + The authentication mechanism protects against an unauthorized login + to storage resources by using a false identity (spoofing). Once the + authentication phase is completed, if the underlying IPsec is not + used, all PDUs are sent and received in clear. The authentication + + + + + +Satran, et al. Standards Track [Page 100] + +RFC 3720 iSCSI April 2004 + + + mechanism alone (without underlying IPsec) should only be used when + there is no risk of eavesdropping, message insertion, deletion, + modification, and replaying. + + Section 11 iSCSI Security Text Keys and Authentication Methods + defines several authentication methods and the exact steps that must + be followed in each of them, including the iSCSI-text-keys and their + allowed values in each step. Whenever an iSCSI initiator gets a + response whose keys, or their values, are not according to the step + definition, it MUST abort the connection. Whenever an iSCSI target + gets a response whose keys, or their values, are not according to the + step definition, it MUST answer with a Login reject with the + "Initiator Error" or "Missing Parameter" status. These statuses are + not intended for cryptographically incorrect values such as the CHAP + response, for which "Authentication Failure" status MUST be + specified. The importance of this rule can be illustrated in CHAP + with target authentication (see Section 11.1.4 Challenge Handshake + Authentication Protocol (CHAP)) where the initiator would have been + able to conduct a reflection attack by omitting his response key + (CHAP_R) using the same CHAP challenge as the target and reflecting + the target's response back to the target. In CHAP, this is prevented + because the target must answer the missing CHAP_R key with a Login + reject with the "Missing Parameter" status. + + For some of the authentication methods, a key specifies the identity + of the iSCSI initiator or target for authentication purposes. The + value associated with that key MAY be different from the iSCSI name + and SHOULD be configurable. (CHAP_N, see Section 11.1.4 Challenge + Handshake Authentication Protocol (CHAP) and SRP_U, see Section + 11.1.3 Secure Remote Password (SRP)). + +8.2.1. CHAP Considerations + + Compliant iSCSI initiators and targets MUST implement the CHAP + authentication method [RFC1994] (according to Section 11.1.4 + Challenge Handshake Authentication Protocol (CHAP) including the + target authentication option). + + When CHAP is performed over a non-encrypted channel, it is vulnerable + to an off-line dictionary attack. Implementations MUST support use + of up to 128 bit random CHAP secrets, including the means to generate + such secrets and to accept them from an external generation source. + Implementations MUST NOT provide secret generation (or expansion) + means other than random generation. + + An administrative entity of an environment in which CHAP is used with + a secret that has less than 96 random bits MUST enforce IPsec + encryption (according to the implementation requirements in Section + + + +Satran, et al. Standards Track [Page 101] + +RFC 3720 iSCSI April 2004 + + + 8.3.2 Confidentiality) to protect the connection. Moreover, in this + case IKE authentication with group pre-shared cryptographic keys + SHOULD NOT be used unless it is not essential to protect group + members against off-line dictionary attacks by other members. + + CHAP secrets MUST be an integral number of bytes (octets). A + compliant implementation SHOULD NOT continue with the login step in + which it should send a CHAP response (CHAP_R, Section 11.1.4 + Challenge Handshake Authentication Protocol (CHAP)) unless it can + verify that the CHAP secret is at least 96 bits, or that IPsec + encryption is being used to protect the connection. + + Any CHAP secret used for initiator authentication MUST NOT be + configured for authentication of any target, and any CHAP secret used + for target authentication MUST NOT be configured for authentication + of any initiator. If the CHAP response received by one end of an + iSCSI connection is the same as the CHAP response that the receiving + endpoint would have generated for the same CHAP challenge, the + response MUST be treated as an authentication failure and cause the + connection to close (this ensures that the same CHAP secret is not + used for authentication in both directions). Also, if an iSCSI + implementation can function as both initiator and target, different + CHAP secrets and identities MUST be configured for these two roles. + The following is an example of the attacks prevented by the above + requirements: + + Rogue wants to impersonate Storage to Alice, and knows that a + single secret is used for both directions of Storage-Alice + authentication. + + Rogue convinces Alice to open two connections to Rogue, and Rogue + identifies itself as Storage on both connections. + + Rogue issues a CHAP challenge on connection 1, waits for Alice to + respond, and then reflects Alice's challenge as the initial + challenge to Alice on connection 2. + + If Alice doesn't check for the reflection across connections, + Alice's response on connection 2 enables Rogue to impersonate + Storage on connection 1, even though Rogue does not know the + Alice-Storage CHAP secret. + + Originators MUST NOT reuse the CHAP challenge sent by the Responder + for the other direction of a bidirectional authentication. + Responders MUST check for this condition and close the iSCSI TCP + connection if it occurs. + + + + + +Satran, et al. Standards Track [Page 102] + +RFC 3720 iSCSI April 2004 + + + The same CHAP secret SHOULD NOT be configured for authentication of + multiple initiators or multiple targets, as this enables any of them + to impersonate any other one of them, and compromising one of them + enables the attacker to impersonate any of them. It is recommended + that iSCSI implementations check for use of identical CHAP secrets by + different peers when this check is feasible, and take appropriate + measures to warn users and/or administrators when this is detected. + + When an iSCSI initiator or target authenticates itself to + counterparts in multiple administrative domains, it SHOULD use a + different CHAP secret for each administrative domain to avoid + propagating security compromises across domains. + + Within a single administrative domain: + - A single CHAP secret MAY be used for authentication of an initiator + to multiple targets. + - A single CHAP secret MAY be used for an authentication of a target + to multiple initiators when the initiators use an external server + (e.g., RADIUS) to verify the target's CHAP responses and do not know + the target's CHAP secret. + + If an external response verification server (e.g., RADIUS) is not + used, employing a single CHAP secret for authentication of a target + to multiple initiators requires that all such initiators know that + target secret. Any of these initiators can impersonate the target to + any other such initiator, and compromise of such an initiator enables + an attacker to impersonate the target to all such initiators. + Targets SHOULD use separate CHAP secrets for authentication to each + initiator when such risks are of concern; in this situation it may be + useful to configure a separate logical iSCSI target with its own + iSCSI Node Name for each initiator or group of initiators among which + such separation is desired. + +8.2.2. SRP Considerations + + The strength of the SRP authentication method (specified in + [RFC2945]) is dependent on the characteristics of the group being + used (i.e., the prime modulus N and generator g). As described in + [RFC2945], N is required to be a Sophie-German prime (of the form + N = 2q + 1, where q is also prime) and the generator g is a primitive + root of GF(n). In iSCSI authentication, the prime modulus N MUST be + at least 768 bits. + + The list of allowed SRP groups is provided in [RFC3723]. + + + + + + + +Satran, et al. Standards Track [Page 103] + +RFC 3720 iSCSI April 2004 + + +8.3. IPsec + + iSCSI uses the IPsec mechanism for packet protection (cryptographic + integrity, authentication, and confidentiality) at the IP level + between the iSCSI communicating end points. The following sections + describe the IPsec protocols that must be implemented for data + integrity and authentication, confidentiality, and cryptographic key + management. + + An iSCSI initiator or target may provide the required IPsec support + fully integrated or in conjunction with an IPsec front-end device. + In the latter case, the compliance requirements with regard to IPsec + support apply to the "combined device". Only the "combined device" + is to be considered an iSCSI device. + + Detailed considerations and recommendations for using IPsec for iSCSI + are provided in [RFC3723]. + +8.3.1. Data Integrity and Authentication + + Data authentication and integrity is provided by a cryptographic + keyed Message Authentication Code in every sent packet. This code + protects against message insertion, deletion, and modification. + Protection against message replay is realized by using a sequence + counter. + + An iSCSI compliant initiator or target MUST provide data integrity + and authentication by implementing IPsec [RFC2401] with ESP [RFC2406] + in tunnel mode and MAY provide data integrity and authentication by + implementing IPsec with ESP in transport mode. The IPsec + implementation MUST fulfill the following iSCSI specific + requirements: + + - HMAC-SHA1 MUST be implemented [RFC2404]. + - AES CBC MAC with XCBC extensions SHOULD be implemented + [RFC3566]. + + The ESP anti-replay service MUST also be implemented. + + At the high speeds iSCSI is expected to operate, a single IPsec SA + could rapidly cycle through the 32-bit IPsec sequence number space. + In view of this, it may be desirable in the future for an iSCSI + implementation that operates at speeds of 1 Gbps or greater to + implement the IPsec sequence number extension [SEQ-EXT]. + + + + + + + +Satran, et al. Standards Track [Page 104] + +RFC 3720 iSCSI April 2004 + + +8.3.2. Confidentiality + + Confidentiality is provided by encrypting the data in every packet. + When confidentiality is used it MUST be accompanied by data integrity + and authentication to provide comprehensive protection against + eavesdropping, message insertion, deletion, modification, and + replaying. + + An iSCSI compliant initiator or target MUST provide confidentiality + by implementing IPsec [RFC2401] with ESP [RFC2406] in tunnel mode and + MAY provide confidentiality by implementing IPsec with ESP in + transport mode, with the following iSCSI specific requirements: + + - 3DES in CBC mode MUST be implemented [RFC2451]. + - AES in Counter mode SHOULD be implemented [RFC3686]. + + DES in CBC mode SHOULD NOT be used due to its inherent weakness. The + NULL encryption algorithm MUST also be implemented. + +8.3.3. Policy, Security Associations, and Cryptographic Key Management + + A compliant iSCSI implementation MUST meet the cryptographic key + management requirements of the IPsec protocol suite. Authentication, + security association negotiation, and cryptographic key management + MUST be provided by implementing IKE [RFC2409] using the IPsec DOI + [RFC2407] with the following iSCSI specific requirements: + + - Peer authentication using a pre-shared cryptographic key MUST be + supported. Certificate-based peer authentication using digital + signatures MAY be supported. Peer authentication using the + public key encryption methods outlined in IKE sections 5.2 and + 5.3[7] SHOULD NOT be used. + + - When digital signatures are used to achieve authentication, an + IKE negotiator SHOULD use IKE Certificate Request Payload(s) to + specify the certificate authority. IKE negotiators SHOULD check + the pertinent Certificate Revocation List (CRL) before accepting + a PKI certificate for use in IKE authentication procedures. + + - Conformant iSCSI implementations MUST support IKE Main Mode and + SHOULD support Aggressive Mode. IKE main mode with pre-shared + key authentication method SHOULD NOT be used when either the + initiator or the target uses dynamically assigned IP addresses. + While in many cases pre-shared keys offer good security, + situations in which dynamically assigned addresses are used force + the use of a group pre-shared key, which creates vulnerability to + a man-in-the-middle attack. + + + + +Satran, et al. Standards Track [Page 105] + +RFC 3720 iSCSI April 2004 + + + - In the IKE Phase 2 Quick Mode, exchanges for creating the Phase 2 + SA, the Identity Payload, fields MUST be present. ID_IPV4_ADDR, + ID_IPV6_ADDR (if the protocol stack supports IPv6) and ID_FQDN + Identity payloads MUST be supported; ID_USER_FQDN SHOULD be + supported. The IP Subnet, IP Address Range, ID_DER_ASN1_DN, and + ID_DER_ASN1_GN formats SHOULD NOT be used. The ID_KEY_ID + Identity Payload MUST NOT be used. + + Manual cryptographic keying MUST NOT be used because it does not + provide the necessary re-keying support. + + When IPsec is used, the receipt of an IKE Phase 2 delete message + SHOULD NOT be interpreted as a reason for tearing down the iSCSI TCP + connection. If additional traffic is sent on it, a new IKE Phase 2 + SA will be created to protect it. + + The method used by the initiator to determine whether the target + should be connected using IPsec is regarded as an issue of IPsec + policy administration, and thus not defined in the iSCSI standard. + + If an iSCSI target is discovered via a SendTargets request in a + discovery session not using IPsec, the initiator should assume that + it does not need IPsec to establish a session to that target. If an + iSCSI target is discovered using a discovery session that does use + IPsec, the initiator SHOULD use IPsec when establishing a session to + that target. + +9. Notes to Implementers + + This section notes some of the performance and reliability + considerations of the iSCSI protocol. This protocol was designed to + allow efficient silicon and software implementations. The iSCSI task + tag mechanism was designed to enable Direct Data Placement (DDP - a + DMA form) at the iSCSI level or lower. + + The guiding assumption made throughout the design of this protocol is + that targets are resource constrained relative to initiators. + + Implementers are also advised to consider the implementation + consequences of the iSCSI to SCSI mapping model as outlined in + Section 3.4.3 Consequences of the Model. + +9.1. Multiple Network Adapters + + The iSCSI protocol allows multiple connections, not all of which need + to go over the same network adapter. If multiple network connections + are to be utilized with hardware support, the iSCSI protocol + + + + +Satran, et al. Standards Track [Page 106] + +RFC 3720 iSCSI April 2004 + + + command-data-status allegiance to one TCP connection ensures that + there is no need to replicate information across network adapters or + otherwise require them to cooperate. + + However, some task management commands may require some loose form of + cooperation or replication at least on the target. + +9.1.1. Conservative Reuse of ISIDs + + Historically, the SCSI model (and implementations and applications + based on that model) has assumed that SCSI ports are static, physical + entities. Recent extensions to the SCSI model have taken advantage + of persistent worldwide unique names for these ports. In iSCSI + however, the SCSI initiator ports are the endpoints of dynamically + created sessions, so the presumptions of "static and physical" do not + apply. In any case, the model clauses (particularly, Section 3.4.2 + SCSI Architecture Model) provide for persistent, reusable names for + the iSCSI-type SCSI initiator ports even though there does not need + to be any physical entity bound to these names. + + To both minimize the disruption of legacy applications and to better + facilitate the SCSI features that rely on persistent names for SCSI + ports, iSCSI implementations SHOULD attempt to provide a stable + presentation of SCSI Initiator Ports (both to the upper OS-layers and + to the targets to which they connect). This can be achieved in an + initiator implementation by conservatively reusing ISIDs. In other + words, the same ISID should be used in the Login process to multiple + target portal groups (of the same iSCSI Target or different iSCSI + Targets). The ISID RULE (Section 3.4.3 Consequences of the Model) + only prohibits reuse to the same target portal group. It does not + "preclude" reuse to other target portal groups. The principle of + conservative reuse "encourages" reuse to other target portal groups. + When a SCSI target device sees the same (InitiatorName, ISID) pair in + different sessions to different target portal groups, it can identify + the underlying SCSI Initiator Port on each session as the same SCSI + port. In effect, it can recognize multiple paths from the same + source. + +9.1.2. iSCSI Name, ISID, and TPGT Use + + The designers of the iSCSI protocol envisioned there being one iSCSI + Initiator Node Name per operating system image on a machine. This + enables SAN resource configuration and authentication schemes based + on a system's identity. It supports the notion that it should be + possible to assign access to storage resources based on "initiator + device" identity. + + + + + +Satran, et al. Standards Track [Page 107] + +RFC 3720 iSCSI April 2004 + + + When there are multiple hardware or software components coordinated + as a single iSCSI Node, there must be some (logical) entity that + represents the iSCSI Node that makes the iSCSI Node Name available to + all components involved in session creation and login. Similarly, + this entity that represents the iSCSI Node must be able to coordinate + session identifier resources (ISID for initiators) to enforce both + the ISID and TSIH RULES (see Section 3.4.3 Consequences of the + Model). + + For targets, because of the closed environment, implementation of + this entity should be straightforward. However, vendors of iSCSI + hardware (e.g., NICs or HBAs) intended for targets, SHOULD provide + mechanisms for configuration of the iSCSI Node Name across the portal + groups instantiated by multiple instances of these components within + a target. + + However, complex targets making use of multiple Target Portal Group + Tags may reconfigure them to achieve various quality goals. The + initiators have two mechanisms at their disposal to discover and/or + check reconfiguring targets - the discovery session type and a key + returned by the target during login to confirm the TPGT. An + initiator should attempt to "rediscover" the target configuration + anytime a session is terminated unexpectedly. + + For initiators, in the long term, it is expected that operating + system vendors will take on the role of this entity and provide + standard APIs that can inform components of their iSCSI Node Name and + can configure and/or coordinate ISID allocation, use, and reuse. + + Recognizing that such initiator APIs are not available today, other + implementations of the role of this entity are possible. For + example, a human may instantiate the (common) Node name as part of + the installation process of each iSCSI component involved in session + creation and login. This may be done either by pointing the + component to a vendor-specific location for this datum or to a + system-wide location. The structure of the ISID namespace (see + Section 10.12.5 ISID and [RFC3721]) facilitates implementation of the + ISID coordination by allowing each component vendor to independently + (of other vendor's components) coordinate allocation, use, and reuse + of its own partition of the ISID namespace in a vendor-specific + manner. Partitioning of the ISID namespace within initiator portal + groups managed by that vendor allows each such initiator portal group + to act independently of all other portal groups when selecting an + ISID for a login; this facilitates enforcement of the ISID RULE (see + Section 3.4.3 Consequences of the Model) at the initiator. + + + + + + +Satran, et al. Standards Track [Page 108] + +RFC 3720 iSCSI April 2004 + + + A vendor of iSCSI hardware (e.g., NICs or HBAs) intended for use in + initiators MUST implement a mechanism for configuring the iSCSI Node + Name. Vendors, and administrators must ensure that iSCSI Node Names + are unique worldwide. It is therefore important that when one + chooses to reuse the iSCSI Node Name of a disabled unit, not to + re-assign that name to the original unit unless its worldwide + uniqueness can be ascertained again. + + In addition, a vendor of iSCSI hardware must implement a mechanism to + configure and/or coordinate ISIDs for all sessions managed by + multiple instances of that hardware within a given iSCSI Node. Such + configuration might be either permanently pre-assigned at the factory + (in a necessarily globally unique way), statically assigned (e.g., + partitioned across all the NICs at initialization in a locally unique + way), or dynamically assigned (e.g., on-line allocator, also in a + locally unique way). In the latter two cases, the configuration may + be via public APIs (perhaps driven by an independent vendor's + software, such as the OS vendor) or via private APIs driven by the + vendor's own software. + +9.2. Autosense and Auto Contingent Allegiance (ACA) + + Autosense refers to the automatic return of sense data to the + initiator in case a command did not complete successfully. iSCSI + initiators and targets MUST support and use autosense. + + ACA helps preserve ordered command execution in the presence of + errors. As iSCSI can have many commands in-flight between initiator + and target, iSCSI initiators and targets SHOULD support ACA. + +9.3. iSCSI Timeouts + + iSCSI recovery actions are often dependent on iSCSI time-outs being + recognized and acted upon before SCSI time-outs. Determining the + right time-outs to use for various iSCSI actions (command + acknowledgements expected, status acknowledgements, etc.) is very + much dependent on infrastructure (hardware, links, TCP/IP stack, + iSCSI driver). As a guide, the implementer may use an average + Nop-Out/Nop-In turnaround delay multiplied by a "safety factor" + (e.g., 4) as a good estimate for the basic delay of the iSCSI stack + for a given connection. The safety factor should account for the + network load variability. For connection teardown the implementer + may want to consider also the TCP common practice for the given + infrastructure. + + + + + + + +Satran, et al. Standards Track [Page 109] + +RFC 3720 iSCSI April 2004 + + + Text negotiations MAY also be subject to either time-limits or limits + in the number of exchanges. Those SHOULD be generous enough to avoid + affecting interoperability (e.g., allowing each key to be negotiated + on a separate exchange). + + The relation between iSCSI timeouts and SCSI timeouts should also be + considered. SCSI timeouts should be longer than iSCSI timeouts plus + the time required for iSCSI recovery whenever iSCSI recovery is + planned. Alternatively, an implementer may choose to interlock iSCSI + timeouts and recovery with SCSI timeouts so that SCSI recovery will + become active only where iSCSI is not planned to, or failed to, + recover. + + The implementer may also want to consider the interaction between + various iSCSI exception events - such as a digest failure - and + subsequent timeouts. When iSCSI error recovery is active, a digest + failure is likely to result in discovering a missing command or data + PDU. In these cases, an implementer may want to lower the timeout + values to enable faster initiation for recovery procedures. + +9.4. Command Retry and Cleaning Old Command Instances + + To avoid having old, retried command instances appear in a valid + command window after a command sequence number wrap around, the + protocol requires (see Section 3.2.2.1 Command Numbering and + Acknowledging) that on every connection on which a retry has been + issued, a non-immediate command be issued and acknowledged within a + 2**31-1 commands interval from the CmdSN of the retried command. + This requirement can be fulfilled by an implementation in several + ways. + + The simplest technique to use is to send a (non-retry) non-immediate + SCSI command (or a NOP if no SCSI command is available for a while) + after every command retry on the connection on which the retry was + attempted. As errors are deemed rare events, this technique is + probably the most effective, as it does not involve additional checks + at the initiator when issuing commands. + +9.5. Synch and Steering Layer and Performance + + While a synch and steering layer is optional, an initiator/target + that does not have it working against a target/initiator that demands + synch and steering may experience performance degradation caused by + packet reordering and loss. Providing a synch and steering mechanism + is recommended for all high-speed implementations. + + + + + + +Satran, et al. Standards Track [Page 110] + +RFC 3720 iSCSI April 2004 + + +9.6. Considerations for State-dependent Devices and Long-lasting SCSI + Operations + + Sequential access devices operate on the principle that the position + of the device is based on the last command processed. As such, + command processing order and knowledge of whether or not the previous + command was processed is of the utmost importance to maintain data + integrity. For example, inadvertent retries of SCSI commands when it + is not known if the previous SCSI command was processed is a + potential data integrity risk. + + For a sequential access device, consider the scenario in which a SCSI + SPACE command to backspace one filemark is issued and then re-issued + due to no status received for the command. If the first SPACE + command was actually processed, the re-issued SPACE command, if + processed, will cause the position to change. Thus, a subsequent + write operation will write data to the wrong position and any + previous data at that position will be overwritten. + + For a medium changer device, consider the scenario in which an + EXCHANGE MEDIUM command (the SOURCE ADDRESS and DESTINATION ADDRESS + are the same thus performing a swap) is issued and then re-issued due + to no status received for the command. If the first EXCHANGE MEDIUM + command was actually processed, the re-issued EXCHANGE MEDIUM + command, if processed, will perform the swap again. The net effect + is that a swap was not performed thus leaving a data integrity + exposure. + + All commands that change the state of the device (as in SPACE + commands for sequential access devices, and EXCHANGE MEDIUM for + medium changer device), MUST be issued as non-immediate commands for + deterministic and in order delivery to iSCSI targets. + + For many of those state changing commands, the execution model also + assumes that the command is executed exactly once. Devices + implementing READ POSITION and LOCATE provide a means for SCSI level + command recovery and new tape-class devices should support those + commands. In their absence a retry at SCSI level is difficult and + error recovery at iSCSI level is advisable. + + Devices operating on long latency delivery subsystems and performing + long lasting SCSI operations may need mechanisms that enable + connection replacement while commands are running (e.g., during an + extended copy operation). + + + + + + + +Satran, et al. Standards Track [Page 111] + +RFC 3720 iSCSI April 2004 + + +9.6.1. Determining the Proper ErrorRecoveryLevel + + The implementation and use of a specific ErrorRecoveryLevel should be + determined based on the deployment scenarios of a given iSCSI + implementation. Generally, the following factors must be considered + before deciding on the proper level of recovery: + + a) Application resilience to I/O failures. + b) Required level of availability in the face of transport + connection failures. + c) Probability of transport layer "checksum escape". This in + turn decides the iSCSI digest failure frequency, and thus the + criticality of iSCSI-level error recovery. The details of + estimating this probability are outside the scope of this + document. + + + A consideration of the above factors for SCSI tape devices as an + example suggests that implementations SHOULD use ErrorRecoveryLevel=1 + when transport connection failure is not a concern and SCSI level + recovery is unavailable, and ErrorRecoveryLevel=2 when the connection + failure is also of high likelihood during a backup/retrieval. + + For extended copy operations, implementations SHOULD use + ErrorRecoveryLevel=2 whenever there is a relatively high likelihood + of connection failure. + +10. iSCSI PDU Formats + + All multi-byte integers that are specified in formats defined in this + document are to be represented in network byte order (i.e., big + endian). Any field that appears in this document assumes that the + most significant byte is the lowest numbered byte and the most + significant bit (within byte or field) is the lowest numbered bit + unless specified otherwise. + + Any compliant sender MUST set all bits not defined and all reserved + fields to zero unless specified otherwise. Any compliant receiver + MUST ignore any bit not defined and all reserved fields unless + specified otherwise. Receipt of reserved code values in defined + fields MUST be reported as a protocol error. + + Reserved fields are marked by the word "reserved", some abbreviation + of "reserved", or by "." for individual bits when no other form of + marking is technically feasible. + + + + + + +Satran, et al. Standards Track [Page 112] + +RFC 3720 iSCSI April 2004 + + +10.1. iSCSI PDU Length and Padding + + iSCSI PDUs are padded to the closest integer number of four byte + words. The padding bytes SHOULD be sent as 0. + +10.2. PDU Template, Header, and Opcodes + + All iSCSI PDUs have one or more header segments and, optionally, a + data segment. After the entire header segment group a header-digest + MAY follow. The data segment MAY also be followed by a data-digest. + + The Basic Header Segment (BHS) is the first segment in all of the + iSCSI PDUs. The BHS is a fixed-length 48-byte header segment. It + MAY be followed by Additional Header Segments (AHS), a Header-Digest, + a Data Segment, and/or a Data-Digest. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 113] + +RFC 3720 iSCSI April 2004 + + + The overall structure of an iSCSI PDU is as follows: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0/ Basic Header Segment (BHS) / + +/ / + +---------------+---------------+---------------+---------------+ + 48/ Additional Header Segment 1 (AHS) (optional) / + +/ / + +---------------+---------------+---------------+---------------+ + / Additional Header Segment 2 (AHS) (optional) / + +/ / + +---------------+---------------+---------------+---------------+ + ---- + +---------------+---------------+---------------+---------------+ + / Additional Header Segment n (AHS) (optional) / + +/ / + +---------------+---------------+---------------+---------------+ + ---- + +---------------+---------------+---------------+---------------+ + k/ Header-Digest (optional) / + +/ / + +---------------+---------------+---------------+---------------+ + l/ Data Segment(optional) / + +/ / + +---------------+---------------+---------------+---------------+ + m/ Data-Digest (optional) / + +/ / + +---------------+---------------+---------------+---------------+ + + All PDU segments and digests are padded to the closest integer number + of four byte words. For example, all PDU segments and digests start + at a four byte word boundary and the padding ranges from 0 to 3 + bytes. The padding bytes SHOULD be sent as 0. + + iSCSI response PDUs do not have AH Segments. + +10.2.1. Basic Header Segment (BHS) + + The BHS is 48 bytes long. The Opcode and DataSegmentLength fields + appear in all iSCSI PDUs. In addition, when used, the Initiator Task + Tag and Logical Unit Number always appear in the same location in the + header. + + + + + + +Satran, et al. Standards Track [Page 114] + +RFC 3720 iSCSI April 2004 + + + The format of the BHS is: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|I| Opcode |F| Opcode-specific fields | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN or Opcode-specific fields | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20/ Opcode-specific fields / + +/ / + +---------------+---------------+---------------+---------------+ + 48 + +10.2.1.1 I + + For request PDUs, the I bit set to 1 is an immediate delivery marker. + +10.2.1.2. Opcode + + The Opcode indicates the type of iSCSI PDU the header encapsulates. + + The Opcodes are divided into two categories: initiator opcodes and + target opcodes. Initiator opcodes are in PDUs sent by the initiator + (request PDUs). Target opcodes are in PDUs sent by the target + (response PDUs). + + Initiators MUST NOT use target opcodes and targets MUST NOT use + initiator opcodes. + + Initiator opcodes defined in this specification are: + + 0x00 NOP-Out + 0x01 SCSI Command (encapsulates a SCSI Command Descriptor Block) + 0x02 SCSI Task Management function request + 0x03 Login Request + 0x04 Text Request + 0x05 SCSI Data-Out (for WRITE operations) + 0x06 Logout Request + 0x10 SNACK Request + 0x1c-0x1e Vendor specific codes + + + +Satran, et al. Standards Track [Page 115] + +RFC 3720 iSCSI April 2004 + + + + Target opcodes are: + + 0x20 NOP-In + 0x21 SCSI Response - contains SCSI status and possibly sense + information or other response information. + 0x22 SCSI Task Management function response + 0x23 Login Response + 0x24 Text Response + 0x25 SCSI Data-In - for READ operations. + 0x26 Logout Response + 0x31 Ready To Transfer (R2T) - sent by target when it is ready + to receive data. + 0x32 Asynchronous Message - sent by target to indicate certain + special conditions. + 0x3c-0x3e Vendor specific codes + 0x3f Reject + + All other opcodes are reserved. + +10.2.1.3. Final (F) bit + + When set to 1 it indicates the final (or only) PDU of a sequence. + +10.2.1.4. Opcode-specific Fields + + These fields have different meanings for different opcode types. + +10.2.1.5. TotalAHSLength + + Total length of all AHS header segments in units of four byte words + including padding, if any. + + The TotalAHSLength is only used in PDUs that have an AHS and MUST be + 0 in all other PDUs. + +10.2.1.6. DataSegmentLength + + This is the data segment payload length in bytes (excluding padding). + The DataSegmentLength MUST be 0 whenever the PDU has no data segment. + +10.2.1.7. LUN + + Some opcodes operate on a specific Logical Unit. The Logical Unit + Number (LUN) field identifies which Logical Unit. If the opcode does + not relate to a Logical Unit, this field is either ignored or may be + used in an opcode specific way. The LUN field is 64-bits and should + + + + +Satran, et al. Standards Track [Page 116] + +RFC 3720 iSCSI April 2004 + + + be formatted in accordance with [SAM2]. For example, LUN[0] from + [SAM2] is BHS byte 8 and so on up to LUN[7] from [SAM2], which is BHS + byte 15. + +10.2.1.8. Initiator Task Tag + + The initiator assigns a Task Tag to each iSCSI task it issues. While + a task exists, this tag MUST uniquely identify the task session-wide. + SCSI may also use the initiator task tag as part of the SCSI task + identifier when the timespan during which an iSCSI initiator task tag + must be unique extends over the timespan during which a SCSI task tag + must be unique. However, the iSCSI Initiator Task Tag must exist and + be unique even for untagged SCSI commands. + +10.2.2. Additional Header Segment (AHS) + + The general format of an AHS is: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0| AHSLength | AHSType | AHS-Specific | + +---------------+---------------+---------------+---------------+ + 4/ AHS-Specific / + +/ / + +---------------+---------------+---------------+---------------+ + x + +10.2.2.1. AHSType + + The AHSType field is coded as follows: + + bit 0-1 - Reserved + + bit 2-7 - AHS code + + 0 - Reserved + 1 - Extended CDB + 2 - Expected Bidirectional Read Data Length + 3 - 63 Reserved + +10.2.2.2. AHSLength + + This field contains the effective length in bytes of the AHS + excluding AHSType and AHSLength and padding, if any. The AHS is + padded to the smallest integer number of 4 byte words (i.e., from 0 + up to 3 padding bytes). + + + +Satran, et al. Standards Track [Page 117] + +RFC 3720 iSCSI April 2004 + + +10.2.2.3. Extended CDB AHS + + The format of the Extended CDB AHS is: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0| AHSLength (CDBLength-15) | 0x01 | Reserved | + +---------------+---------------+---------------+---------------+ + 4/ ExtendedCDB...+padding / + +/ / + +---------------+---------------+---------------+---------------+ + x + + This type of AHS MUST NOT be used if the CDBLength is less than 17. + The length includes the reserved byte 3. + +10.2.2.4. Bidirectional Expected Read-Data Length AHS + + The format of the Bidirectional Read Expected Data Transfer Length + AHS is: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0| AHSLength (0x0005) | 0x02 | Reserved | + +---------------+---------------+---------------+---------------+ + 4| Expected Read-Data Length | + +---------------+---------------+---------------+---------------+ + 8 + +10.2.3. Header Digest and Data Digest + + Optional header and data digests protect the integrity of the header + and data, respectively. The digests, if present, are located, + respectively, after the header and PDU-specific data, and cover + respectively the header and the PDU data, each including the padding + bytes, if any. + + The existence and type of digests are negotiated during the Login + Phase. + + The separation of the header and data digests is useful in iSCSI + routing applications, in which only the header changes when a message + is forwarded. In this case, only the header digest should be + recalculated. + + + +Satran, et al. Standards Track [Page 118] + +RFC 3720 iSCSI April 2004 + + + Digests are not included in data or header length fields. + + A zero-length Data Segment also implies a zero-length data-digest. + +10.2.4. Data Segment + + The (optional) Data Segment contains PDU associated data. Its + payload effective length is provided in the BHS field - + DataSegmentLength. The Data Segment is also padded to an integer + number of 4 byte words. + +10.3. SCSI Command + + The format of the SCSI Command PDU is: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|I| 0x01 |F|R|W|. .|ATTR | Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| Logical Unit Number (LUN) | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Expected Data Transfer Length | + +---------------+---------------+---------------+---------------+ + 24| CmdSN | + +---------------+---------------+---------------+---------------+ + 28| ExpStatSN | + +---------------+---------------+---------------+---------------+ + 32/ SCSI Command Descriptor Block (CDB) / + +/ / + +---------------+---------------+---------------+---------------+ + 48/ AHS (Optional) / + +---------------+---------------+---------------+---------------+ + x/ Header Digest (Optional) / + +---------------+---------------+---------------+---------------+ + y/ (DataSegment, Command Data) (Optional) / + +/ / + +---------------+---------------+---------------+---------------+ + z/ Data Digest (Optional) / + +---------------+---------------+---------------+---------------+ + + + + +Satran, et al. Standards Track [Page 119] + +RFC 3720 iSCSI April 2004 + + +10.3.1. Flags and Task Attributes (byte 1) + + The flags for a SCSI Command are: + + bit 0 (F) is set to 1 when no unsolicited SCSI Data-Out PDUs follow + this PDU. When F=1 for a write and if Expected Data + Transfer Length is larger than the DataSegmentLength, the + target may solicit additional data through R2T. + + bit 1 (R) is set to 1 when the command is expected to input data. + + bit 2 (W) is set to 1 when the command is expected to output data. + + bit 3-4 Reserved. + + bit 5-7 contains Task Attributes. + + Task Attributes (ATTR) have one of the following integer values (see + [SAM2] for details): + + 0 - Untagged + 1 - Simple + 2 - Ordered + 3 - Head of Queue + 4 - ACA + 5-7 - Reserved + + Setting both the W and the F bit to 0 is an error. Either or both of + R and W MAY be 1 when either the Expected Data Transfer Length and/or + Bidirectional Read Expected Data Transfer Length are 0, but they MUST + NOT both be 0 when the Expected Data Transfer Length and/or + Bidirectional Read Expected Data Transfer Length are not 0 (i.e., + when some data transfer is expected the transfer direction is + indicated by the R and/or W bit). + +10.3.2. CmdSN - Command Sequence Number + + Enables ordered delivery across multiple connections in a single + session. + +10.3.3. ExpStatSN + + Command responses up to ExpStatSN-1 (mod 2**32) have been received + (acknowledges status) on the connection. + + + + + + + +Satran, et al. Standards Track [Page 120] + +RFC 3720 iSCSI April 2004 + + +10.3.4. Expected Data Transfer Length + + For unidirectional operations, the Expected Data Transfer Length + field contains the number of bytes of data involved in this SCSI + operation. For a unidirectional write operation (W flag set to 1 and + R flag set to 0), the initiator uses this field to specify the number + of bytes of data it expects to transfer for this operation. For a + unidirectional read operation (W flag set to 0 and R flag set to 1), + the initiator uses this field to specify the number of bytes of data + it expects the target to transfer to the initiator. It corresponds + to the SAM2 byte count. + + For bidirectional operations (both R and W flags are set to 1), this + field contains the number of data bytes involved in the write + transfer. For bidirectional operations, an additional header segment + MUST be present in the header sequence that indicates the + Bidirectional Read Expected Data Transfer Length. The Expected Data + Transfer Length field and the Bidirectional Read Expected Data + Transfer Length field correspond to the SAM2 byte count + + If the Expected Data Transfer Length for a write and the length of + the immediate data part that follows the command (if any) are the + same, then no more data PDUs are expected to follow. In this case, + the F bit MUST be set to 1. + + If the Expected Data Transfer Length is higher than the + FirstBurstLength (the negotiated maximum amount of unsolicited data + the target will accept), the initiator MUST send the maximum amount + of unsolicited data OR ONLY the immediate data, if any. + + Upon completion of a data transfer, the target informs the initiator + (through residual counts) of how many bytes were actually processed + (sent and/or received) by the target. + +10.3.5. CDB - SCSI Command Descriptor Block + + There are 16 bytes in the CDB field to accommodate the commonly used + CDBs. Whenever the CDB is larger than 16 bytes, an Extended CDB AHS + MUST be used to contain the CDB spillover. + +10.3.6. Data Segment - Command Data + + Some SCSI commands require additional parameter data to accompany the + SCSI command. This data may be placed beyond the boundary of the + iSCSI header in a data segment. Alternatively, user data (e.g., from + a WRITE operation) can be placed in the data segment (both cases are + + + + + +Satran, et al. Standards Track [Page 121] + +RFC 3720 iSCSI April 2004 + + + referred to as immediate data). These data are governed by the rules + for solicited vs. unsolicited data outlined in Section 3.2.4.2 Data + Transfer Overview. + +10.4. SCSI Response + + The format of the SCSI Response PDU is: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x21 |1|. .|o|u|O|U|.| Response | Status | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| SNACK Tag or Reserved | + +---------------+---------------+---------------+---------------+ + 24| StatSN | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36| ExpDataSN or Reserved | + +---------------+---------------+---------------+---------------+ + 40| Bidirectional Read Residual Count or Reserved | + +---------------+---------------+---------------+---------------+ + 44| Residual Count or Reserved | + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + / Data Segment (Optional) / + +/ / + +---------------+---------------+---------------+---------------+ + | Data-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + + + + + + + +Satran, et al. Standards Track [Page 122] + +RFC 3720 iSCSI April 2004 + + +10.4.1. Flags (byte 1) + + bit 1-2 Reserved. + + bit 3 - (o) set for Bidirectional Read Residual Overflow. In this + case, the Bidirectional Read Residual Count indicates the number + of bytes that were not transferred to the initiator because the + initiator's Expected Bidirectional Read Data Transfer Length was + not sufficient. + + bit 4 - (u) set for Bidirectional Read Residual Underflow. In this + case, the Bidirectional Read Residual Count indicates the number + of bytes that were not transferred to the initiator out of the + number of bytes expected to be transferred. + + bit 5 - (O) set for Residual Overflow. In this case, the Residual + Count indicates the number of bytes that were not transferred + because the initiator's Expected Data Transfer Length was not + sufficient. For a bidirectional operation, the Residual Count + contains the residual for the write operation. + + bit 6 - (U) set for Residual Underflow. In this case, the Residual + Count indicates the number of bytes that were not transferred out + of the number of bytes that were expected to be transferred. For + a bidirectional operation, the Residual Count contains the + residual for the write operation. + + bit 7 - (0) Reserved. + + Bits O and U and bits o and u are mutually exclusive (i.e., having + both o and u or O and U set to 1 is a protocol error). For a + response other than "Command Completed at Target", bits 3-6 MUST be + 0. + +10.4.2. Status + + The Status field is used to report the SCSI status of the command (as + specified in [SAM2]) and is only valid if the Response Code is + Command Completed at target. + + + + + + + + + + + + +Satran, et al. Standards Track [Page 123] + +RFC 3720 iSCSI April 2004 + + + Some of the status codes defined in [SAM2] are: + + 0x00 GOOD + 0x02 CHECK CONDITION + 0x08 BUSY + 0x18 RESERVATION CONFLICT + 0x28 TASK SET FULL + 0x30 ACA ACTIVE + 0x40 TASK ABORTED + + See [SAM2] for the complete list and definitions. + + If a SCSI device error is detected while data from the initiator is + still expected (the command PDU did not contain all the data and the + target has not received a Data PDU with the final bit Set), the + target MUST wait until it receives a Data PDU with the F bit set in + the last expected sequence before sending the Response PDU. + +10.4.3. Response + + This field contains the iSCSI service response. + + iSCSI service response codes defined in this specification are: + + 0x00 - Command Completed at Target + 0x01 - Target Failure + 0x80-0xff - Vendor specific + + All other response codes are reserved. + + The Response is used to report a Service Response. The mapping of + the response code into a SCSI service response code value, if needed, + is outside the scope of this document. However, in symbolic terms + response value 0x00 maps to the SCSI service response (see [SAM2] and + [SPC3]) of TASK COMPLETE or LINKED COMMAND COMPLETE. All other + Response values map to the SCSI service response of SERVICE DELIVERY + OR TARGET FAILURE. + + If a PDU that includes SCSI status (Response PDU or Data-In PDU + including status) does not arrive before the session is terminated, + the SCSI service response is SERVICE DELIVERY OR TARGET FAILURE. + + A non-zero Response field indicates a failure to execute the command + in which case the Status and Flag fields are undefined. + + + + + + + +Satran, et al. Standards Track [Page 124] + +RFC 3720 iSCSI April 2004 + + +10.4.4. SNACK Tag + + This field contains a copy of the SNACK Tag of the last SNACK Tag + accepted by the target on the same connection and for the command for + which the response is issued. Otherwise it is reserved and should be + set to 0. + + After issuing a R-Data SNACK the initiator must discard any SCSI + status unless contained in an SCSI Response PDU carrying the same + SNACK Tag as the last issued R-Data SNACK for the SCSI command on the + current connection. + + For a detailed discussion on R-Data SNACK see Section 10.16 SNACK + Request. + +10.4.5. Residual Count + + The Residual Count field MUST be valid in the case where either the U + bit or the O bit is set. If neither bit is set, the Residual Count + field is reserved. Targets may set the residual count and initiators + may use it when the response code is "completed at target" (even if + the status returned is not GOOD). If the O bit is set, the Residual + Count indicates the number of bytes that were not transferred because + the initiator's Expected Data Transfer Length was not sufficient. If + the U bit is set, the Residual Count indicates the number of bytes + that were not transferred out of the number of bytes expected to be + transferred. + +10.4.6. Bidirectional Read Residual Count + + The Bidirectional Read Residual Count field MUST be valid in the case + where either the u bit or the o bit is set. If neither bit is set, + the Bidirectional Read Residual Count field is reserved. Targets may + set the Bidirectional Read Residual Count and initiators may use it + when the response code is "completed at target". If the o bit is + set, the Bidirectional Read Residual Count indicates the number of + bytes that were not transferred to the initiator because the + initiator's Expected Bidirectional Read Transfer Length was not + sufficient. If the u bit is set, the Bidirectional Read Residual + Count indicates the number of bytes that were not transferred to the + initiator out of the number of bytes expected to be transferred. + +10.4.7. Data Segment - Sense and Response Data Segment + + iSCSI targets MUST support and enable autosense. If Status is CHECK + CONDITION (0x02), then the Data Segment MUST contain sense data for + the failed command. + + + + +Satran, et al. Standards Track [Page 125] + +RFC 3720 iSCSI April 2004 + + + For some iSCSI responses, the response data segment MAY contain some + response related information, (e.g., for a target failure, it may + contain a vendor specific detailed description of the failure). + + If the DataSegmentLength is not 0, the format of the Data Segment is + as follows: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|SenseLength | Sense Data | + +---------------+---------------+---------------+---------------+ + x/ Sense Data / + +---------------+---------------+---------------+---------------+ + y/ Response Data / + / / + +---------------+---------------+---------------+---------------+ + z| + +10.4.7.1. SenseLength + + Length of Sense Data. + +10.4.7.2. Sense Data + + The Sense Data contains detailed information about a check condition + and [SPC3] specifies the format and content of the Sense Data. + + Certain iSCSI conditions result in the command being terminated at + the target (response Command Completed at Target) with a SCSI Check + Condition Status as outlined in the next table: + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 126] + +RFC 3720 iSCSI April 2004 + + + +--------------------------+----------+---------------------------+ + | iSCSI Condition |Sense | Additional Sense Code & | + | |Key | Qualifier | + +--------------------------+----------+---------------------------+ + | Unexpected unsolicited |Aborted | ASC = 0x0c ASCQ = 0x0c | + | data |Command-0B| Write Error | + +--------------------------+----------+---------------------------+ + | Incorrect amount of data |Aborted | ASC = 0x0c ASCQ = 0x0d | + | |Command-0B| Write Error | + +--------------------------+----------+---------------------------+ + | Protocol Service CRC |Aborted | ASC = 0x47 ASCQ = 0x05 | + | error |Command-0B| CRC Error Detected | + +--------------------------+----------+---------------------------+ + | SNACK rejected |Aborted | ASC = 0x11 ASCQ = 0x13 | + | |Command-0B| Read Error | + +--------------------------+----------+---------------------------+ + + The target reports the "Incorrect amount of data" condition if during + data output the total data length to output is greater than + FirstBurstLength and the initiator sent unsolicited non-immediate + data but the total amount of unsolicited data is different than + FirstBurstLength. The target reports the same error when the amount + of data sent as a reply to an R2T does not match the amount + requested. + +10.4.8. ExpDataSN + + The number of R2T and Data-In (read) PDUs the target has sent for the + command. + + This field MUST be 0 if the response code is not Command Completed at + Target or the target sent no Data-In PDUs for the command. + +10.4.9. StatSN - Status Sequence Number + + StatSN is a Sequence Number that the target iSCSI layer generates per + connection and that in turn, enables the initiator to acknowledge + status reception. StatSN is incremented by 1 for every + response/status sent on a connection except for responses sent as a + result of a retry or SNACK. In the case of responses sent due to a + retransmission request, the StatSN MUST be the same as the first time + the PDU was sent unless the connection has since been restarted. + + + + + + + + + +Satran, et al. Standards Track [Page 127] + +RFC 3720 iSCSI April 2004 + + +10.4.10. ExpCmdSN - Next Expected CmdSN from this Initiator + + ExpCmdSN is a Sequence Number that the target iSCSI returns to the + initiator to acknowledge command reception. It is used to update a + local variable with the same name. An ExpCmdSN equal to MaxCmdSN+1 + indicates that the target cannot accept new commands. + +10.4.11. MaxCmdSN - Maximum CmdSN from this Initiator + + MaxCmdSN is a Sequence Number that the target iSCSI returns to the + initiator to indicate the maximum CmdSN the initiator can send. It + is used to update a local variable with the same name. If MaxCmdSN + is equal to ExpCmdSN-1, this indicates to the initiator that the + target cannot receive any additional commands. When MaxCmdSN changes + at the target while the target has no pending PDUs to convey this + information to the initiator, it MUST generate a NOP-IN to carry the + new MaxCmdSN. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 128] + +RFC 3720 iSCSI April 2004 + + +10.5. Task Management Function Request + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|I| 0x02 |1| Function | Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| Logical Unit Number (LUN) or Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Referenced Task Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 24| CmdSN | + +---------------+---------------+---------------+---------------+ + 28| ExpStatSN | + +---------------+---------------+---------------+---------------+ + 32| RefCmdSN or Reserved | + +---------------+---------------+---------------+---------------+ + 36| ExpDataSN or Reserved | + +---------------+---------------+---------------+---------------+ + 40/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + +10.5.1. Function + + The Task Management functions provide an initiator with a way to + explicitly control the execution of one or more Tasks (SCSI and iSCSI + tasks). The Task Management function codes are listed below. For a + more detailed description of SCSI task management, see [SAM2]. + + 1 - ABORT TASK - aborts the task identified by the Referenced Task + Tag field. + + 2 - ABORT TASK SET - aborts all Tasks issued via this session on the + logical unit. + + 3 - CLEAR ACA - clears the Auto Contingent Allegiance condition. + + + + + +Satran, et al. Standards Track [Page 129] + +RFC 3720 iSCSI April 2004 + + + 4 - CLEAR TASK SET - aborts all Tasks in the appropriate task set as + defined by the TST field in the Control mode page (see [SPC3]). + + 5 - LOGICAL UNIT RESET + + 6 - TARGET WARM RESET + + 7 - TARGET COLD RESET + + 8 - TASK REASSIGN - reassigns connection allegiance for the task + identified by the Referenced Task Tag field to this connection, + thus resuming the iSCSI exchanges for the task. + + For all these functions, the Task Management function response MUST + be returned as detailed in Section 10.6 Task Management Function + Response. All these functions apply to the referenced tasks + regardless of whether they are proper SCSI tasks or tagged iSCSI + operations. Task management requests must act on all the commands + from the same session having a CmdSN lower than the task management + CmdSN. LOGICAL UNIT RESET, TARGET WARM RESET and TARGET COLD RESET + may affect commands from other sessions or commands from the same + session with CmdSN equal or exceeding CmdSN. + + If the task management request is marked for immediate delivery, it + must be considered immediately for execution, but the operations + involved (all or part of them) may be postponed to allow the target + to receive all relevant tasks. According to [SAM2], for all the + tasks covered by the Task Management response (i.e., with CmdSN lower + than the task management command CmdSN) but except the Task + Management response to a TASK REASSIGN, additional responses MUST NOT + be delivered to the SCSI layer after the Task Management response. + The iSCSI initiator MAY deliver to the SCSI layer all responses + received before the Task Management response (i.e., it is a matter of + implementation if the SCSI responses, received before the Task + Management response but after the task management request was issued, + are delivered to the SCSI layer by the iSCSI layer in the initiator). + The iSCSI target MUST ensure that no responses for the tasks covered + by a task management function are delivered to the iSCSI initiator + after the Task Management response except for a task covered by a + TASK REASSIGN. + + For ABORT TASK SET and CLEAR TASK SET, the issuing initiator MUST + continue to respond to all valid target transfer tags (received via + R2T, Text Response, NOP-In, or SCSI Data-In PDUs) related to the + affected task set, even after issuing the task management request. + The issuing initiator SHOULD however terminate (i.e., by setting the + F-bit to 1) these response sequences as quickly as possible. The + target on its part MUST wait for responses on all affected target + + + +Satran, et al. Standards Track [Page 130] + +RFC 3720 iSCSI April 2004 + + + transfer tags before acting on either of these two task management + requests. In case all or part of the response sequence is not + received (due to digest errors) for a valid TTT, the target MAY treat + it as a case of within-command error recovery class (see Section + 6.1.4.1 Recovery Within-command) if it is supporting + ErrorRecoveryLevel >= 1, or alternatively may drop the connection to + complete the requested task set function. + + If an ABORT TASK is issued for a task created by an immediate command + then RefCmdSN MUST be that of the Task Management request itself + (i.e., CmdSN and RefCmdSN are equal); otherwise RefCmdSN MUST be set + to the CmdSN of the task to be aborted (lower than CmdSN). + + If the connection is still active (it is not undergoing an implicit + or explicit logout), ABORT TASK MUST be issued on the same connection + to which the task to be aborted is allegiant at the time the Task + Management Request is issued. If the connection is implicitly or + explicitly logged out (i.e., no other request will be issued on the + failing connection and no other response will be received on the + failing connection), then an ABORT TASK function request may be + issued on another connection. This Task Management request will then + establish a new allegiance for the command to be aborted as well as + abort it (i.e., the task to be aborted will not have to be retried or + reassigned, and its status, if issued but not acknowledged, will be + reissued followed by the Task Management response). + + At the target an ABORT TASK function MUST NOT be executed on a Task + Management request; such a request MUST result in Task Management + response of "Function rejected". + + For the LOGICAL UNIT RESET function, the target MUST behave as + dictated by the Logical Unit Reset function in [SAM2]. + + The implementation of the TARGET WARM RESET function and the TARGET + COLD RESET function is OPTIONAL and when implemented, should act as + described below. The TARGET WARM RESET is also subject to SCSI + access controls on the requesting initiator as defined in [SPC3]. + When authorization fails at the target, the appropriate response as + described in Section 10.6 Task Management Function Response MUST be + returned by the target. The TARGET COLD RESET function is not + subject to SCSI access controls, but its execution privileges may be + managed by iSCSI mechanisms such as login authentication. + + When executing the TARGET WARM RESET and TARGET COLD RESET functions, + the target cancels all pending operations on all Logical Units known + by the issuing initiator. Both functions are equivalent to the + Target Reset function specified by [SAM2]. They can affect many + other initiators logged in with the servicing SCSI target port. + + + +Satran, et al. Standards Track [Page 131] + +RFC 3720 iSCSI April 2004 + + + The target MUST treat the TARGET COLD RESET function additionally as + a power on event, thus terminating all of its TCP connections to all + initiators (all sessions are terminated). For this reason, the + Service Response (defined by [SAM2]) for this SCSI task management + function may not be reliably delivered to the issuing initiator port. + + For the TASK REASSIGN function, the target should reassign the + connection allegiance to this new connection (and thus resume iSCSI + exchanges for the task). TASK REASSIGN MUST ONLY be received by the + target after the connection on which the command was previously + executing has been successfully logged-out. The Task Management + response MUST be issued before the reassignment becomes effective. + For additional usage semantics see Section 6.2 Retry and Reassign in + Recovery. + + At the target a TASK REASSIGN function request MUST NOT be executed + to reassign the connection allegiance of a Task Management function + request, an active text negotiation task, or a Logout task; such a + request MUST result in Task Management response of "Function + rejected". + + TASK REASSIGN MUST be issued as an immediate command. + +10.5.2. TotalAHSLength and DataSegmentLength + + For this PDU TotalAHSLength and DataSegmentLength MUST be 0. + +10.5.3. LUN + + This field is required for functions that address a specific LU + (ABORT TASK, CLEAR TASK SET, ABORT TASK SET, CLEAR ACA, LOGICAL UNIT + RESET) and is reserved in all others. + +10.5.4. Referenced Task Tag + + The Initiator Task Tag of the task to be aborted for the ABORT TASK + function or reassigned for the TASK REASSIGN function. For all the + other functions this field MUST be set to the reserved value + 0xffffffff. + +10.5.5. RefCmdSN + + If an ABORT TASK is issued for a task created by an immediate command + then RefCmdSN MUST be that of the Task Management request itself + (i.e., CmdSN and RefCmdSN are equal). + + + + + + +Satran, et al. Standards Track [Page 132] + +RFC 3720 iSCSI April 2004 + + + For an ABORT TASK of a task created by non-immediate command RefCmdSN + MUST be set to the CmdSN of the task identified by the Referenced + Task Tag field. Targets must use this field as described in section + 10.6.1 when the task identified by the Referenced Task Tag field is + not with the target. + + Otherwise, this field is reserved. + +10.5.6. ExpDataSN + + For recovery purposes, the iSCSI target and initiator maintain a data + acknowledgement reference number - the first input DataSN number + unacknowledged by the initiator. When issuing a new command, this + number is set to 0. If the function is TASK REASSIGN, which + establishes a new connection allegiance for a previously issued Read + or Bidirectional command, ExpDataSN will contain an updated data + acknowledgement reference number or the value 0; the latter + indicating that the data acknowledgement reference number is + unchanged. The initiator MUST discard any data PDUs from the + previous execution that it did not acknowledge and the target MUST + transmit all Data-In PDUs (if any) starting with the data + acknowledgement reference number. The number of retransmitted PDUs + may or may not be the same as the original transmission depending on + if there was a change in MaxRecvDataSegmentLength in the + reassignment. The target MAY also send no more Data-In PDUs if all + data has been acknowledged. + + The value of ExpDataSN MUST be 0 or higher than the DataSN of the + last acknowledged Data-In PDU, but not larger than DataSN+1 of the + last Data-In PDU sent by the target. Any other value MUST be ignored + by the target. + + For other functions this field is reserved. + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 133] + +RFC 3720 iSCSI April 2004 + + +10.6. Task Management Function Response + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x22 |1| Reserved | Response | Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------------------------------------------------------+ + 8/ Reserved / + / / + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Reserved | + +---------------+---------------+---------------+---------------+ + 24| StatSN | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + For the functions ABORT TASK, ABORT TASK SET, CLEAR ACA, CLEAR TASK + SET, LOGICAL UNIT RESET, TARGET COLD RESET, TARGET WARM RESET and + TASK REASSIGN, the target performs the requested Task Management + function and sends a Task Management response back to the initiator. + For TASK REASSIGN, the new connection allegiance MUST ONLY become + effective at the target after the target issues the Task Management + Response. + +10.6.1. Response + + The target provides a Response, which may take on the following + values: + + a) 0 - Function complete. + b) 1 - Task does not exist. + c) 2 - LUN does not exist. + d) 3 - Task still allegiant. + e) 4 - Task allegiance reassignment not supported. + + + + +Satran, et al. Standards Track [Page 134] + +RFC 3720 iSCSI April 2004 + + + f) 5 - Task management function not supported. + g) 6 - Function authorization failed. + h) 255 - Function rejected. + + All other values are reserved. + + For a discussion on usage of response codes 3 and 4, see Section + 6.2.2 Allegiance Reassignment. + + For the TARGET COLD RESET and TARGET WARM RESET functions, the target + cancels all pending operations across all Logical Units known to the + issuing initiator. For the TARGET COLD RESET function, the target + MUST then close all of its TCP connections to all initiators + (terminates all sessions). + + The mapping of the response code into a SCSI service response code + value, if needed, is outside the scope of this document. However, in + symbolic terms Response values 0 and 1 map to the SCSI service + response of FUNCTION COMPLETE. All other Response values map to the + SCSI service response of FUNCTION REJECTED. If a Task Management + function response PDU does not arrive before the session is + terminated, the SCSI service response is SERVICE DELIVERY OR TARGET + FAILURE. + + The response to ABORT TASK SET and CLEAR TASK SET MUST only be issued + by the target after all of the commands affected have been received + by the target, the corresponding task management functions have been + executed by the SCSI target, and the delivery of all responses + delivered until the task management function completion have been + confirmed (acknowledged through ExpStatSN) by the initiator on all + connections of this session. For the exact timeline of events, refer + to Section 10.6.2 Task Management Actions on Task Sets. + + For the ABORT TASK function, + + a) If the Referenced Task Tag identifies a valid task leading to + a successful termination, then targets must return the + "Function complete" response. + b) If the Referenced Task Tag does not identify an existing task, + but if the CmdSN indicated by the RefCmdSN field in the Task + Management function request is within the valid CmdSN window + and less than the CmdSN of the Task Management function + request itself, then targets must consider the CmdSN received + and return the "Function complete" response. + + + + + + + +Satran, et al. Standards Track [Page 135] + +RFC 3720 iSCSI April 2004 + + + c) If the Referenced Task Tag does not identify an existing task + and if the CmdSN indicated by the RefCmdSN field in the Task + Management function request is outside the valid CmdSN window, + then targets must return the "Task does not exist" response. + +10.6.2. Task Management Actions on Task Sets + + The execution of ABORT TASK SET and CLEAR TASK SET Task Management + function requests consists of the following sequence of events in the + specified order on each of the entities. + + The initiator: + + a) Issues ABORT TASK SET/CLEAR TASK SET request. + b) Continues to respond to each target transfer tag received + for the affected task set. + c) Receives any responses for the tasks in the affected task + set (may process them as usual because they are guaranteed + to be valid). + d) Receives the task set management response, thus concluding + all the tasks in the affected task set. + + The target: + + a) Receives the ABORT TASK SET/CLEAR TASK SET request. + b) Waits for all target transfer tags to be responded to and + for all affected tasks in the task set to be received. + c) Propagates the command to and receives the response from the + target SCSI layer. + d) Takes note of last-sent StatSN on each of the connections in + the iSCSI sessions (one or more) sharing the affected task + set, and waits for acknowledgement of each StatSN (may + solicit for acknowledgement by way of a NOP-In). If some + tasks originate from non-iSCSI I_T_L nexi then the means by + which the target insures that all affected tasks have + returned their status to the initiator are defined by the + specific protocol. + + e) Sends the task set management response to the issuing + initiator. + + + + + + + + + + + +Satran, et al. Standards Track [Page 136] + +RFC 3720 iSCSI April 2004 + + +10.6.3. TotalAHSLength and DataSegmentLength + + For this PDU TotalAHSLength and DataSegmentLength MUST be 0. + +10.7. SCSI Data-Out & SCSI Data-In + + The SCSI Data-Out PDU for WRITE operations has the following format: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x05 |F| Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN or Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Target Transfer Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 24| Reserved | + +---------------+---------------+---------------+---------------+ + 28| ExpStatSN | + +---------------+---------------+---------------+---------------+ + 32| Reserved | + +---------------+---------------+---------------+---------------+ + 36| DataSN | + +---------------+---------------+---------------+---------------+ + 40| Buffer Offset | + +---------------+---------------+---------------+---------------+ + 44| Reserved | + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + / DataSegment / + +/ / + +---------------+---------------+---------------+---------------+ + | Data-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + + + + + + + +Satran, et al. Standards Track [Page 137] + +RFC 3720 iSCSI April 2004 + + + The SCSI Data-In PDU for READ operations has the following format: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x25 |F|A|0 0 0|O|U|S| Reserved |Status or Rsvd | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN or Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Target Transfer Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 24| StatSN or Reserved | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36| DataSN | + +---------------+---------------+---------------+---------------+ + 40| Buffer Offset | + +---------------+---------------+---------------+---------------+ + 44| Residual Count | + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + / DataSegment / + +/ / + +---------------+---------------+---------------+---------------+ + | Data-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + Status can accompany the last Data-In PDU if the command did not end + with an exception (i.e., the status is "good status" - GOOD, + CONDITION MET or INTERMEDIATE CONDITION MET). The presence of status + (and of a residual count) is signaled though the S flag bit. + Although targets MAY choose to send even non-exception status in + separate responses, initiators MUST support non-exception status in + Data-In PDUs. + + + + + + +Satran, et al. Standards Track [Page 138] + +RFC 3720 iSCSI April 2004 + + +10.7.1. F (Final) Bit + + For outgoing data, this bit is 1 for the last PDU of unsolicited data + or the last PDU of a sequence that answers an R2T. + + For incoming data, this bit is 1 for the last input (read) data PDU + of a sequence. Input can be split into several sequences, each + having its own F bit. Splitting the data stream into sequences does + not affect DataSN counting on Data-In PDUs. It MAY be used as a + "change direction" indication for Bidirectional operations that need + such a change. + + DataSegmentLength MUST not exceed MaxRecvDataSegmentLength for the + direction it is sent and the total of all the DataSegmentLength of + all PDUs in a sequence MUST not exceed MaxBurstLength (or + FirstBurstLength for unsolicited data). However the number of + individual PDUs in a sequence (or in total) may be higher than the + MaxBurstLength (or FirstBurstLength) to MaxRecvDataSegmentLength + ratio (as PDUs may be limited in length by the sender capabilities). + Using DataSegmentLength of 0 may increase beyond what is reasonable + for the number of PDUs and should therefore be avoided. + + For Bidirectional operations, the F bit is 1 for both the end of the + input sequences and the end of the output sequences. + +10.7.2. A (Acknowledge) Bit + + For sessions with ErrorRecoveryLevel 1 or higher, the target sets + this bit to 1 to indicate that it requests a positive acknowledgement + from the initiator for the data received. The target should use the + A bit moderately; it MAY only set the A bit to 1 once every + MaxBurstLength bytes, or on the last Data-In PDU that concludes the + entire requested read data transfer for the task from the target's + perspective, and it MUST NOT do so more frequently. The target MUST + NOT set to 1 the A bit for sessions with ErrorRecoveryLevel=0. The + initiator MUST ignore the A bit set to 1 for sessions with + ErrorRecoveryLevel=0. + + On receiving a Data-In PDU with the A bit set to 1 on a session with + ErrorRecoveryLevel greater than 0, if there are no holes in the read + data until that Data-In PDU, the initiator MUST issue a SNACK of type + DataACK except when it is able to acknowledge the status for the task + immediately via ExpStatSN on other outbound PDUs if the status for + the task is also received. In the latter case (acknowledgement + through ExpStatSN), sending a SNACK of type DataACK in response to + the A bit is OPTIONAL, but if it is done, it must not be sent after + the status acknowledgement through ExpStatSN. If the initiator has + detected holes in the read data prior to that Data-In PDU, it MUST + + + +Satran, et al. Standards Track [Page 139] + +RFC 3720 iSCSI April 2004 + + + postpone issuing the SNACK of type DataACK until the holes are + filled. An initiator also MUST NOT acknowledge the status for the + task before those holes are filled. A status acknowledgement for a + task that generated the Data-In PDUs is considered by the target as + an implicit acknowledgement of the Data-In PDUs if such an + acknowledgement was requested by the target. + +10.7.3. Flags (byte 1) + + The last SCSI Data packet sent from a target to an initiator for a + SCSI command that completed successfully (with a status of GOOD, + CONDITION MET, INTERMEDIATE or INTERMEDIATE CONDITION MET) may also + optionally contain the Status for the data transfer. As Sense Data + cannot be sent together with the Command Status, if the command is + completed with an error, then the response and sense data MUST be + sent in a SCSI Response PDU (i.e., MUST NOT be sent in a SCSI Data + packet). If Status is sent with the data, then a SCSI Response PDU + MUST NOT be sent as this would violate SCSI rules (a single status). + For Bidirectional commands, the status MUST be sent in a SCSI + Response PDU. + + bit 2-4 - Reserved. + + bit 5-6 - used the same as in a SCSI Response. These bits are + only valid when S is set to 1. For details see Section + 10.4.1 Flags (byte 1). + + bit 7 S (status)- set to indicate that the Command Status field + contains status. If this bit is set to 1, the F bit + MUST also be set to 1. + + The fields StatSN, Status, and Residual Count only have meaningful + content if the S bit is set to 1 and their values are defined in + Section 10.4 SCSI Response. + +10.7.4. Target Transfer Tag and LUN + + On outgoing data, the Target Transfer Tag is provided to the target + if the transfer is honoring an R2T. In this case, the Target + Transfer Tag field is a replica of the Target Transfer Tag provided + with the R2T. + + On incoming data, the Target Transfer Tag and LUN MUST be provided by + the target if the A bit is set to 1; otherwise they are reserved. + The Target Transfer Tag and LUN are copied by the initiator into the + SNACK of type DataACK that it issues as a result of receiving a SCSI + Data-In PDU with the A bit set to 1. + + + + +Satran, et al. Standards Track [Page 140] + +RFC 3720 iSCSI April 2004 + + + The Target Transfer Tag values are not specified by this protocol + except that the value 0xffffffff is reserved and means that the + Target Transfer Tag is not supplied. If the Target Transfer Tag is + provided, then the LUN field MUST hold a valid value and be + consistent with whatever was specified with the command; otherwise, + the LUN field is reserved. + +10.7.5. DataSN + + For input (read) or bidirectional Data-In PDUs, the DataSN is the + input PDU number within the data transfer for the command identified + by the Initiator Task Tag. + + R2T and Data-In PDUs, in the context of bidirectional commands, share + the numbering sequence (see Section 3.2.2.3 Data Sequencing). + + For output (write) data PDUs, the DataSN is the Data-Out PDU number + within the current output sequence. The current output sequence is + either identified by the Initiator Task Tag (for unsolicited data) or + is a data sequence generated for one R2T (for data solicited through + R2T). + +10.7.6. Buffer Offset + + The Buffer Offset field contains the offset of this PDU payload data + within the complete data transfer. The sum of the buffer offset and + length should not exceed the expected transfer length for the + command. + + The order of data PDUs within a sequence is determined by + DataPDUInOrder. When set to Yes, it means that PDUs have to be in + increasing Buffer Offset order and overlays are forbidden. + + The ordering between sequences is determined by DataSequenceInOrder. + When set to Yes, it means that sequences have to be in increasing + Buffer Offset order and overlays are forbidden. + +10.7.7. DataSegmentLength + + This is the data payload length of a SCSI Data-In or SCSI Data-Out + PDU. The sending of 0 length data segments should be avoided, but + initiators and targets MUST be able to properly receive 0 length data + segments. + + The Data Segments of Data-In and Data-Out PDUs SHOULD be filled to + the integer number of 4 byte words (real payload) unless the F bit is + set to 1. + + + + +Satran, et al. Standards Track [Page 141] + +RFC 3720 iSCSI April 2004 + + +10.8. Ready To Transfer (R2T) + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x31 |1| Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Target Transfer Tag | + +---------------+---------------+---------------+---------------+ + 24| StatSN | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36| R2TSN | + +---------------+---------------+---------------+---------------+ + 40| Buffer Offset | + +---------------+---------------+---------------+---------------+ + 44| Desired Data Transfer Length | + +---------------------------------------------------------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + When an initiator has submitted a SCSI Command with data that passes + from the initiator to the target (WRITE), the target may specify + which blocks of data it is ready to receive. The target may request + that the data blocks be delivered in whichever order is convenient + for the target at that particular instant. This information is + passed from the target to the initiator in the Ready To Transfer + (R2T) PDU. + + In order to allow write operations without an explicit initial R2T, + the initiator and target MUST have negotiated the key InitialR2T to + No during Login. + + An R2T MAY be answered with one or more SCSI Data-Out PDUs with a + matching Target Transfer Tag. If an R2T is answered with a single + Data-Out PDU, the Buffer Offset in the Data PDU MUST be the same as + + + +Satran, et al. Standards Track [Page 142] + +RFC 3720 iSCSI April 2004 + + + the one specified by the R2T, and the data length of the Data PDU + MUST be the same as the Desired Data Transfer Length specified in the + R2T. If the R2T is answered with a sequence of Data PDUs, the Buffer + Offset and Length MUST be within the range of those specified by R2T, + and the last PDU MUST have the F bit set to 1. If the last PDU + (marked with the F bit) is received before the Desired Data Transfer + Length is transferred, a target MAY choose to Reject that + + PDU with "Protocol error" reason code. DataPDUInOrder governs the + Data-Out PDU ordering. If DataPDUInOrder is set to Yes, the Buffer + Offsets and Lengths for consecutive PDUs MUST form a continuous + non-overlapping range and the PDUs MUST be sent in increasing offset + order. + + The target may send several R2T PDUs. It, therefore, can have a + number of pending data transfers. The number of outstanding R2T PDUs + are limited by the value of the negotiated key MaxOutstandingR2T. + Within a connection, outstanding R2Ts MUST be fulfilled by the + initiator in the order in which they were received. + + R2T PDUs MAY also be used to recover Data Out PDUs. Such an R2T + (Recovery-R2T) is generated by a target upon detecting the loss of + one or more Data-Out PDUs due to: + + - Digest error + - Sequence error + - Sequence reception timeout + + A Recovery-R2T carries the next unused R2TSN, but requests part of or + the entire data burst that an earlier R2T (with a lower R2TSN) had + already requested. + + DataSequenceInOrder governs the buffer offset ordering in consecutive + R2Ts. If DataSequenceInOrder is Yes, then consecutive R2Ts MUST + refer to continuous non-overlapping ranges except for Recovery-R2Ts. + +10.8.1. TotalAHSLength and DataSegmentLength + + For this PDU TotalAHSLength and DataSegmentLength MUST be 0. + +10.8.2. R2TSN + + R2TSN is the R2T PDU input PDU number within the command identified + by the Initiator Task Tag. + + For bidirectional commands R2T and Data-In PDUs share the input PDU + numbering sequence (see Section 3.2.2.3 Data Sequencing). + + + + +Satran, et al. Standards Track [Page 143] + +RFC 3720 iSCSI April 2004 + + +10.8.3. StatSN + + The StatSN field will contain the next StatSN. The StatSN for this + connection is not advanced after this PDU is sent. + +10.8.4. Desired Data Transfer Length and Buffer Offset + + The target specifies how many bytes it wants the initiator to send + because of this R2T PDU. The target may request the data from the + initiator in several chunks, not necessarily in the original order of + the data. The target, therefore, also specifies a Buffer Offset that + indicates the point at which the data transfer should begin, relative + to the beginning of the total data transfer. The Desired Data + Transfer Length MUST NOT be 0 and MUST not exceed MaxBurstLength. + +10.8.5. Target Transfer Tag + + The target assigns its own tag to each R2T request that it sends to + the initiator. This tag can be used by the target to easily identify + the data it receives. The Target Transfer Tag and LUN are copied in + the outgoing data PDUs and are only used by the target. There is no + protocol rule about the Target Transfer Tag except that the value + 0xffffffff is reserved and MUST NOT be sent by a target in an R2T. + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 144] + +RFC 3720 iSCSI April 2004 + + +10.9. Asynchronous Message + + An Asynchronous Message may be sent from the target to the initiator + without correspondence to a particular command. The target specifies + the reason for the event and sense data. + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x32 |1| Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN or Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| 0xffffffff | + +---------------+---------------+---------------+---------------+ + 20| Reserved | + +---------------+---------------+---------------+---------------+ + 24| StatSN | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36| AsyncEvent | AsyncVCode | Parameter1 or Reserved | + +---------------+---------------+---------------+---------------+ + 40| Parameter2 or Reserved | Parameter3 or Reserved | + +---------------+---------------+---------------+---------------+ + 44| Reserved | + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + / DataSegment - Sense Data and iSCSI Event Data / + +/ / + +---------------+---------------+---------------+---------------+ + | Data-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + Some Asynchronous Messages are strictly related to iSCSI while others + are related to SCSI [SAM2]. + + StatSN counts this PDU as an acknowledgeable event (StatSN is + advanced), which allows for initiator and target state + synchronization. + + + +Satran, et al. Standards Track [Page 145] + +RFC 3720 iSCSI April 2004 + + +10.9.1. AsyncEvent + + The codes used for iSCSI Asynchronous Messages (events) are: + + 0 - a SCSI Asynchronous Event is reported in the sense data. + Sense Data that accompanies the report, in the data segment, + identifies the condition. The sending of a SCSI Event + (Asynchronous Event Reporting in SCSI terminology) is + dependent on the target support for SCSI asynchronous event + reporting (see [SAM2]) as indicated in the standard INQUIRY + data (see [SPC3]). Its use may be enabled by parameters in + the SCSI Control mode page (see [SPC3]). + + 1 - target requests Logout. This Async Message MUST be sent on + the same connection as the one requesting to be logged out. + The initiator MUST honor this request by issuing a Logout as + early as possible, but no later than Parameter3 seconds. + Initiator MUST send a Logout with a reason code of "Close the + connection" OR "Close the session" to close all the + connections. Once this message is received, the initiator + SHOULD NOT issue new iSCSI commands on the connection to be + logged out. The target MAY reject any new I/O requests that + it receives after this Message with the reason code "Waiting + for Logout". If the initiator does not Logout in Parameter3 + seconds, the target should send an Async PDU with iSCSI event + code "Dropped the connection" if possible, or simply terminate + the transport connection. Parameter1 and Parameter2 are + reserved. + + 2 - target indicates it will drop the connection. The Parameter1 + field indicates the CID of the connection that is going to be + dropped. + + The Parameter2 field (Time2Wait) indicates, in seconds, the + minimum time to wait before attempting to reconnect or + reassign. + + The Parameter3 field (Time2Retain) indicates the maximum time + allowed to reassign commands after the initial wait (in + Parameter2). + + If the initiator does not attempt to reconnect and/or reassign + the outstanding commands within the time specified by + Parameter3, or if Parameter3 is 0, the target will terminate + all outstanding commands on this connection. In this case, no + other responses should be expected from the target for the + outstanding commands on this connection. + + + + +Satran, et al. Standards Track [Page 146] + +RFC 3720 iSCSI April 2004 + + + A value of 0 for Parameter2 indicates that reconnect can be + attempted immediately. + + 3 - target indicates it will drop all the connections of this + session. + + Parameter1 field is reserved. + + The Parameter2 field (Time2Wait) indicates, in seconds, the + minimum time to wait before attempting to reconnect. The + Parameter3 field (Time2Retain) indicates the maximum time + allowed to reassign commands after the initial wait (in + Parameter2). + + If the initiator does not attempt to reconnect and/or reassign + the outstanding commands within the time specified by + Parameter3, or if Parameter3 is 0, the session is terminated. + + In this case, the target will terminate all outstanding + commands in this session; no other responses should be + expected from the target for the outstanding commands in this + session. A value of 0 for Parameter2 indicates that reconnect + can be attempted immediately. + + 4 - target requests parameter negotiation on this connection. The + initiator MUST honor this request by issuing a Text Request + (that can be empty) on the same connection as early as + possible, but no later than Parameter3 seconds, unless a Text + Request is already pending on the connection, or by issuing a + Logout Request. If the initiator does not issue a Text + Request the target may reissue the Asynchronous Message + requesting parameter negotiation. + + 255 - vendor specific iSCSI Event. The AsyncVCode details the + vendor code, and data MAY accompany the report. + + All other event codes are reserved. + +10.9.2. AsyncVCode + + AsyncVCode is a vendor specific detail code that is only valid if the + AsyncEvent field indicates a vendor specific event. Otherwise, it is + reserved. + +10.9.3. LUN + + The LUN field MUST be valid if AsyncEvent is 0. Otherwise, this + field is reserved. + + + +Satran, et al. Standards Track [Page 147] + +RFC 3720 iSCSI April 2004 + + +10.9.4. Sense Data and iSCSI Event Data + + For a SCSI event, this data accompanies the report in the data + segment and identifies the condition. + + For an iSCSI event, additional vendor-unique data MAY accompany the + Async event. Initiators MAY ignore the data when not understood + while processing the rest of the PDU. + + If the DataSegmentLength is not 0, the format of the DataSegment is + as follows: + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|SenseLength | Sense Data | + +---------------+---------------+---------------+---------------+ + x/ Sense Data / + +---------------+---------------+---------------+---------------+ + y/ iSCSI Event Data / + / / + +---------------+---------------+---------------+---------------+ + z| + +10.9.4.1. SenseLength + + This is the length of Sense Data. When the Sense Data field is empty + (e.g., the event is not a SCSI event) SenseLength is 0. + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 148] + +RFC 3720 iSCSI April 2004 + + +10.10. Text Request + + The Text Request is provided to allow for the exchange of information + and for future extensions. It permits the initiator to inform a + target of its capabilities or to request some special operations. + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|I| 0x04 |F|C| Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN or Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Target Transfer Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 24| CmdSN | + +---------------+---------------+---------------+---------------+ + 28| ExpStatSN | + +---------------+---------------+---------------+---------------+ + 32/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + / DataSegment (Text) / + +/ / + +---------------+---------------+---------------+---------------+ + | Data-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + An initiator MUST have at most one outstanding Text Request on a + connection at any given time. + + On a connection failure, an initiator must either explicitly abort + any active allegiant text negotiation task or must cause such a task + to be implicitly terminated by the target. + + + + + + + + +Satran, et al. Standards Track [Page 149] + +RFC 3720 iSCSI April 2004 + + +10.10.1. F (Final) Bit + + When set to 1, indicates that this is the last or only text request + in a sequence of Text Requests; otherwise, it indicates that more + Text Requests will follow. + +10.10.2. C (Continue) Bit + + When set to 1, indicates that the text (set of key=value pairs) in + this Text Request is not complete (it will be continued on subsequent + Text Requests); otherwise, it indicates that this Text Request ends a + set of key=value pairs. A Text Request with the C bit set to 1 MUST + have the F bit set to 0. + +10.10.3. Initiator Task Tag + + The initiator assigned identifier for this Text Request. If the + command is sent as part of a sequence of text requests and responses, + the Initiator Task Tag MUST be the same for all the requests within + the sequence (similar to linked SCSI commands). The I bit for all + requests in a sequence also MUST be the same. + +10.10.4. Target Transfer Tag + + When the Target Transfer Tag is set to the reserved value 0xffffffff, + it tells the target that this is a new request and the target resets + any internal state associated with the Initiator Task Tag (resets the + current negotiation state). + + The target sets the Target Transfer Tag in a text response to a value + other than the reserved value 0xffffffff whenever it indicates that + it has more data to send or more operations to perform that are + associated with the specified Initiator Task Tag. It MUST do so + whenever it sets the F bit to 0 in the response. By copying the + Target Transfer Tag from the response to the next Text Request, the + initiator tells the target to continue the operation for the specific + Initiator Task Tag. The initiator MUST ignore the Target Transfer + Tag in the Text Response when the F bit is set to 1. + + This mechanism allows the initiator and target to transfer a large + amount of textual data over a sequence of text-command/text-response + exchanges, or to perform extended negotiation sequences. + + If the Target Transfer Tag is not 0xffffffff, the LUN field MUST be + sent by the target in the Text Response. + + + + + + +Satran, et al. Standards Track [Page 150] + +RFC 3720 iSCSI April 2004 + + + A target MAY reset its internal negotiation state if an exchange is + stalled by the initiator for a long time or if it is running out of + resources. + + Long text responses are handled as in the following example: + + I->T Text SendTargets=All (F=1,TTT=0xffffffff) + T->I Text <part 1> (F=0,TTT=0x12345678) + I->T Text <empty> (F=1, TTT=0x12345678) + T->I Text <part 2> (F=0, TTT=0x12345678) + I->T Text <empty> (F=1, TTT=0x12345678) + ... + T->I Text <part n> (F=1, TTT=0xffffffff) + +10.10.5. Text + + The data lengths of a text request MUST NOT exceed the iSCSI target + MaxRecvDataSegmentLength (a per connection and per direction + negotiated parameter). The text format is specified in Section 5.2 + Text Mode Negotiation. + + Chapter 11 and Chapter 12 list some basic Text key=value pairs, some + of which can be used in Login Request/Response and some in Text + Request/Response. + + A key=value pair can span Text request or response boundaries. A + key=value pair can start in one PDU and continue on the next. In + other words the end of a PDU does not necessarily signal the end of a + key=value pair. + + The target responds by sending its response back to the initiator. + The response text format is similar to the request text format. The + text response MAY refer to key=value pairs presented in an earlier + text request and the text in the request may refer to earlier + responses. + + Chapter 5 details the rules for the Text Requests and Responses. + + Text operations are usually meant for parameter setting/ + negotiations, but can also be used to perform some long lasting + operations. + + Text operations that take a long time should be placed in their own + Text request. + + + + + + + +Satran, et al. Standards Track [Page 151] + +RFC 3720 iSCSI April 2004 + + +10.11. Text Response + + The Text Response PDU contains the target's responses to the + initiator's Text request. The format of the Text field matches that + of the Text request. + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x24 |F|C| Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN or Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Target Transfer Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 24| StatSN | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + / DataSegment (Text) / + +/ / + +---------------+---------------+---------------+---------------+ + | Data-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + +10.11.1. F (Final) Bit + + When set to 1, in response to a Text Request with the Final bit set + to 1, the F bit indicates that the target has finished the whole + operation. Otherwise, if set to 0 in response to a Text Request with + the Final Bit set to 1, it indicates that the target has more work to + do (invites a follow-on text request). A Text Response with the F + bit set to 1 in response to a Text Request with the F bit set to 0 is + a protocol error. + + + +Satran, et al. Standards Track [Page 152] + +RFC 3720 iSCSI April 2004 + + + A Text Response with the F bit set to 1 MUST NOT contain key=value + pairs that may require additional answers from the initiator. + + A Text Response with the F bit set to 1 MUST have a Target Transfer + Tag field set to the reserved value of 0xffffffff. + + A Text Response with the F bit set to 0 MUST have a Target Transfer + Tag field set to a value other than the reserved 0xffffffff. + +10.11.2. C (Continue) Bit + + When set to 1, indicates that the text (set of key=value pairs) in + this Text Response is not complete (it will be continued on + subsequent Text Responses); otherwise, it indicates that this Text + Response ends a set of key=value pairs. A Text Response with the C + bit set to 1 MUST have the F bit set to 0. + +10.11.3. Initiator Task Tag + + The Initiator Task Tag matches the tag used in the initial Text + Request. + +10.11.4. Target Transfer Tag + + When a target has more work to do (e.g., cannot transfer all the + remaining text data in a single Text Response or has to continue the + negotiation) and has enough resources to proceed, it MUST set the + Target Transfer Tag to a value other than the reserved value of + 0xffffffff. Otherwise, the Target Transfer Tag MUST be set to + 0xffffffff. + + When the Target Transfer Tag is not 0xffffffff, the LUN field may be + significant. + + The initiator MUST copy the Target Transfer Tag and LUN in its next + request to indicate that it wants the rest of the data. + + When the target receives a Text Request with the Target Transfer Tag + set to the reserved value of 0xffffffff, it resets its internal + information (resets state) associated with the given Initiator Task + Tag (restarts the negotiation). + + When a target cannot finish the operation in a single Text Response, + and does not have enough resources to continue, it rejects the Text + Request with the appropriate Reject code. + + + + + + +Satran, et al. Standards Track [Page 153] + +RFC 3720 iSCSI April 2004 + + + A target may reset its internal state associated with an Initiator + Task Tag (the current negotiation state), state expressed through the + Target Transfer Tag if the initiator fails to continue the exchange + for some time. The target may reject subsequent Text Requests with + the Target Transfer Tag set to the "stale" value. + +10.11.5. StatSN + + The target StatSN variable is advanced by each Text Response sent. + +10.11.6. Text Response Data + + The data lengths of a text response MUST NOT exceed the iSCSI + initiator MaxRecvDataSegmentLength (a per connection and per + direction negotiated parameter). + + The text in the Text Response Data is governed by the same rules as + the text in the Text Request Data (see Section 10.10.5 Text). + + Although the initiator is the requesting party and controls the + request-response initiation and termination, the target can offer + key=value pairs of its own as part of a sequence and not only in + response to the initiator. + +10.12. Login Request + + After establishing a TCP connection between an initiator and a + target, the initiator MUST start a Login Phase to gain further access + to the target's resources. + + The Login Phase (see Chapter 5) consists of a sequence of Login + Requests and Responses that carry the same Initiator Task Tag. + + Login Requests are always considered as immediate. + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 154] + +RFC 3720 iSCSI April 2004 + + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|1| 0x03 |T|C|.|.|CSG|NSG| Version-max | Version-min | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| ISID | + + +---------------+---------------+ + 12| | TSIH | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| CID | Reserved | + +---------------+---------------+---------------+---------------+ + 24| CmdSN | + +---------------+---------------+---------------+---------------+ + 28| ExpStatSN or Reserved | + +---------------+---------------+---------------+---------------+ + 32| Reserved | + +---------------+---------------+---------------+---------------+ + 36| Reserved | + +---------------+---------------+---------------+---------------+ + 40/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 48/ DataSegment - Login Parameters in Text request Format / + +/ / + +---------------+---------------+---------------+---------------+ + +10.12.1. T (Transit) Bit + + If set to 1, indicates that the initiator is ready to transit to the + next stage. + + If the T bit is set to 1 and NSG is FullFeaturePhase, then this also + indicates that the initiator is ready for the Final Login Response + (see Chapter 5). + +10.12.2. C (Continue) Bit + + When set to 1, indicates that the text (set of key=value pairs) in + this Login Request is not complete (it will be continued on + subsequent Login Requests); otherwise, it indicates that this Login + Request ends a set of key=value pairs. A Login Request with the C + bit set to 1 MUST have the T bit set to 0. + + + + +Satran, et al. Standards Track [Page 155] + +RFC 3720 iSCSI April 2004 + + +10.12.3. CSG and NSG + + Through these fields, Current Stage (CSG) and Next Stage (NSG), the + Login negotiation requests and responses are associated with a + specific stage in the session (SecurityNegotiation, + LoginOperationalNegotiation, FullFeaturePhase) and may indicate the + next stage to which they want to move (see Chapter 5). The next + stage value is only valid when the T bit is 1; otherwise, it is + reserved. + + The stage codes are: + + - 0 - SecurityNegotiation + - 1 - LoginOperationalNegotiation + - 3 - FullFeaturePhase + + All other codes are reserved. + +10.12.4. Version + + The version number of the current draft is 0x00. As such, all + devices MUST carry version 0x00 for both Version-min and Version-max. + +10.12.4.1. Version-max + + Maximum Version number supported. + + All Login Requests within the Login Phase MUST carry the same + Version-max. + + The target MUST use the value presented with the first Login Request. + +10.12.4.2. Version-min + + All Login Requests within the Login Phase MUST carry the same + Version-min. The target MUST use the value presented with the first + Login Request. + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 156] + +RFC 3720 iSCSI April 2004 + + +10.12.5. ISID + + This is an initiator-defined component of the session identifier and + is structured as follows (see [RFC3721] and Section 9.1.1 + Conservative Reuse of ISIDs for details): + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 8| T | A | B | C | + +---------------+---------------+---------------+---------------+ + 12| D | + +---------------+---------------+ + + The T field identifies the format and usage of A, B, C, and D as + indicated below: + + T + + 00b OUI-Format + A&B are a 22 bit OUI + (the I/G & U/L bits are omitted) + C&D 24 bit qualifier + 01b EN - Format (IANA Enterprise Number) + A - Reserved + B&C EN (IANA Enterprise Number) + D - Qualifier + 10b "Random" + A - Reserved + B&C Random + D - Qualifier + 11b A,B,C&D Reserved + + For the T field values 00b and 01b, a combination of A and B (for + 00b) or B and C (for 01b) identifies the vendor or organization whose + component (software or hardware) generates this ISID. A vendor or + organization with one or more OUIs, or one or more Enterprise + Numbers, MUST use at least one of these numbers and select the + appropriate value for the T field when its components generate ISIDs. + An OUI or EN MUST be set in the corresponding fields in network byte + order (byte big-endian). + + If the T field is 10b, B and C are set to a random 24-bit unsigned + integer value in network byte order (byte big-endian). See [RFC3721] + for how this affects the principle of "conservative reuse". + + + + + +Satran, et al. Standards Track [Page 157] + +RFC 3720 iSCSI April 2004 + + + The Qualifier field is a 16 or 24-bit unsigned integer value that + provides a range of possible values for the ISID within the selected + namespace. It may be set to any value within the constraints + specified in the iSCSI protocol (see Section 3.4.3 Consequences of + the Model and Section 9.1.1 Conservative Reuse of ISIDs). + + The T field value of 11b is reserved. + + If the ISID is derived from something assigned to a hardware adapter + or interface by a vendor, as a preset default value, it MUST be + configurable to a value assigned according to the SCSI port behavior + desired by the system in which it is installed (see Section 9.1.1 + Conservative Reuse of ISIDs and Section 9.1.2 iSCSI Name, ISID, and + TPGT Use). The resultant ISID MUST also be persistent over power + cycles, reboot, card swap, etc. + +10.12.6. TSIH + + TSIH must be set in the first Login Request. The reserved value 0 + MUST be used on the first connection for a new session. Otherwise, + the TSIH sent by the target at the conclusion of the successful login + of the first connection for this session MUST be used. The TSIH + identifies to the target the associated existing session for this new + connection. + + All Login Requests within a Login Phase MUST carry the same TSIH. + + The target MUST check the value presented with the first Login + Request and act as specified in Section 5.3.1 Login Phase Start. + +10.12.7. Connection ID - CID + + A unique ID for this connection within the session. + + All Login Requests within the Login Phase MUST carry the same CID. + + The target MUST use the value presented with the first Login Request. + + A Login Request with a non-zero TSIH and a CID equal to that of an + existing connection implies a logout of the connection followed by a + Login (see Section 5.3.4 Connection Reinstatement). For the details + of the implicit Logout Request, see Section 10.14 Logout Request. + + + + + + + + + +Satran, et al. Standards Track [Page 158] + +RFC 3720 iSCSI April 2004 + + +10.12.8. CmdSN + + CmdSN is either the initial command sequence number of a session (for + the first Login Request of a session - the "leading" login), or the + command sequence number in the command stream if the login is for a + new connection in an existing session. + + Examples: + + - Login on a leading connection - if the leading login carries + the CmdSN 123, all other Login Requests in the same Login Phase + carry the CmdSN 123 and the first non-immediate command in + FullFeaturePhase also carries the CmdSN 123. + + - Login on other than a leading connection - if the current CmdSN + at the time the first login on the connection is issued is 500, + then that PDU carries CmdSN=500. Subsequent Login Requests + that are needed to complete this Login Phase may carry a CmdSN + higher than 500 if non-immediate requests that were issued on + other connections in the same session advance CmdSN. + + If the Login Request is a leading Login Request, the target MUST use + the value presented in CmdSN as the target value for ExpCmdSN. + +10.12.9. ExpStatSN + + For the first Login Request on a connection this is ExpStatSN for the + old connection and this field is only valid if the Login Request + restarts a connection (see Section 5.3.4 Connection Reinstatement). + + For subsequent Login Requests it is used to acknowledge the Login + Responses with their increasing StatSN values. + +10.12.10. Login Parameters + + The initiator MUST provide some basic parameters in order to enable + the target to determine if the initiator may use the target's + resources and the initial text parameters for the security exchange. + + All the rules specified in Section 10.10.5 Text for text requests + also hold for Login Requests. Keys and their explanations are listed + in Chapter 11 (security negotiation keys) and Chapter 12 (operational + parameter negotiation keys). All keys in Chapter 12, except for the + X extension formats, MUST be supported by iSCSI initiators and + targets. Keys in Chapter 11 only need to be supported when the + function to which they refer is mandatory to implement. + + + + + +Satran, et al. Standards Track [Page 159] + +RFC 3720 iSCSI April 2004 + + +10.13. Login Response + + The Login Response indicates the progress and/or end of the Login + Phase. + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x23 |T|C|.|.|CSG|NSG| Version-max | Version-active| + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| ISID | + + +---------------+---------------+ + 12| | TSIH | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Reserved | + +---------------+---------------+---------------+---------------+ + 24| StatSN | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36| Status-Class | Status-Detail | Reserved | + +---------------+---------------+---------------+---------------+ + 40/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 48/ DataSegment - Login Parameters in Text request Format / + +/ / + +---------------+---------------+---------------+---------------+ + +10.13.1. Version-max + + This is the highest version number supported by the target. + + All Login Responses within the Login Phase MUST carry the same + Version-max. + + The initiator MUST use the value presented as a response to the first + Login Request. + + + + + + +Satran, et al. Standards Track [Page 160] + +RFC 3720 iSCSI April 2004 + + +10.13.2. Version-active + + Indicates the highest version supported by the target and initiator. + If the target does not support a version within the range specified + by the initiator, the target rejects the login and this field + indicates the lowest version supported by the target. + + All Login Responses within the Login Phase MUST carry the same + Version-active. + + The initiator MUST use the value presented as a response to the first + Login Request. + +10.13.3. TSIH + + The TSIH is the target assigned session identifying handle. Its + internal format and content are not defined by this protocol except + for the value 0 that is reserved. With the exception of the Login + Final-Response in a new session, this field should be set to the TSIH + provided by the initiator in the Login Request. For a new session, + the target MUST generate a non-zero TSIH and ONLY return it in the + Login Final-Response (see Section 5.3 Login Phase). + +10.13.4. StatSN + + For the first Login Response (the response to the first Login + Request), this is the starting status Sequence Number for the + connection. The next response of any kind, including the next Login + Response, if any, in the same Login Phase, will carry this number + + 1. This field is only valid if the Status-Class is 0. + +10.13.5. Status-Class and Status-Detail + + The Status returned in a Login Response indicates the execution + status of the Login Phase. The status includes: + + Status-Class + Status-Detail + + 0 Status-Class indicates success. + + A non-zero Status-Class indicates an exception. In this case, + Status-Class is sufficient for a simple initiator to use when + handling exceptions, without having to look at the Status-Detail. + The Status-Detail allows finer-grained exception handling for more + sophisticated initiators and for better information for logging. + + + + + +Satran, et al. Standards Track [Page 161] + +RFC 3720 iSCSI April 2004 + + + The status classes are as follows: + + 0 - Success - indicates that the iSCSI target successfully + received, understood, and accepted the request. The numbering + fields (StatSN, ExpCmdSN, MaxCmdSN) are only valid if + Status-Class is 0. + + 1 - Redirection - indicates that the initiator must take further + action to complete the request. This is usually due to the + target moving to a different address. All of the redirection + status class responses MUST return one or more text key + parameters of the type "TargetAddress", which indicates the + target's new address. A redirection response MAY be issued by + a target prior or after completing a security negotiation if a + security negotiation is required. A redirection SHOULD be + accepted by an initiator even without having the target + complete a security negotiation if any security negotiation is + required, and MUST be accepted by the initiator after the + completion of the security negotiation if any security + negotiation is required. + + 2 - Initiator Error (not a format error) - indicates that the + initiator most likely caused the error. This MAY be due to a + request for a resource for which the initiator does not have + permission. The request should not be tried again. + + 3 - Target Error - indicates that the target sees no errors in the + initiator's Login Request, but is currently incapable of + fulfilling the request. The initiator may re-try the same + Login Request later. + + The table below shows all of the currently allocated status codes. + The codes are in hexadecimal; the first byte is the status class and + the second byte is the status detail. + + ----------------------------------------------------------------- + Status | Code | Description + |(hex) | + ----------------------------------------------------------------- + Success | 0000 | Login is proceeding OK (*1). + ----------------------------------------------------------------- + Target moved | 0101 | The requested iSCSI Target Name (ITN) + temporarily | | has temporarily moved + | | to the address provided. + ----------------------------------------------------------------- + Target moved | 0102 | The requested ITN has permanently moved + permanently | | to the address provided. + ----------------------------------------------------------------- + + + +Satran, et al. Standards Track [Page 162] + +RFC 3720 iSCSI April 2004 + + + Initiator | 0200 | Miscellaneous iSCSI initiator + error | | errors. + ---------------------------------------------------------------- + Authentication| 0201 | The initiator could not be + failure | | successfully authenticated or target + | | authentication is not supported. + ----------------------------------------------------------------- + Authorization | 0202 | The initiator is not allowed access + failure | | to the given target. + ----------------------------------------------------------------- + Not found | 0203 | The requested ITN does not + | | exist at this address. + ----------------------------------------------------------------- + Target removed| 0204 | The requested ITN has been removed and + | |no forwarding address is provided. + ----------------------------------------------------------------- + Unsupported | 0205 | The requested iSCSI version range is + version | | not supported by the target. + ----------------------------------------------------------------- + Too many | 0206 | Too many connections on this SSID. + connections | | + ----------------------------------------------------------------- + Missing | 0207 | Missing parameters (e.g., iSCSI + parameter | | Initiator and/or Target Name). + ----------------------------------------------------------------- + Can't include | 0208 | Target does not support session + in session | | spanning to this connection (address). + ----------------------------------------------------------------- + Session type | 0209 | Target does not support this type of + not supported | | of session or not from this Initiator. + ----------------------------------------------------------------- + Session does | 020a | Attempt to add a connection + not exist | | to a non-existent session. + ----------------------------------------------------------------- + Invalid during| 020b | Invalid Request type during Login. + login | | + ----------------------------------------------------------------- + Target error | 0300 | Target hardware or software error. + ----------------------------------------------------------------- + Service | 0301 | The iSCSI service or target is not + unavailable | | currently operational. + ----------------------------------------------------------------- + Out of | 0302 | The target has insufficient session, + resources | | connection, or other resources. + ----------------------------------------------------------------- + + + + + + +Satran, et al. Standards Track [Page 163] + +RFC 3720 iSCSI April 2004 + + + (*1) If the response T bit is 1 in both the request and the matching + response, and the NSG is FullFeaturePhase in both the request and the + matching response, the Login Phase is finished and the initiator may + proceed to issue SCSI commands. + + If the Status Class is not 0, the initiator and target MUST close the + TCP connection. + + If the target wishes to reject the Login Request for more than one + reason, it should return the primary reason for the rejection. + +10.13.6. T (Transit) bit + + The T bit is set to 1 as an indicator of the end of the stage. If + the T bit is set to 1 and NSG is FullFeaturePhase, then this is also + the Final Login Response (see Chapter 5). A T bit of 0 indicates a + "partial" response, which means "more negotiation needed". + + A Login Response with a T bit set to 1 MUST NOT contain key=value + pairs that may require additional answers from the initiator within + the same stage. + + If the status class is 0, the T bit MUST NOT be set to 1 if the T bit + in the request was set to 0. + +10.13.7. C (Continue) Bit + + When set to 1, indicates that the text (set of key=value pairs) in + this Login Response is not complete (it will be continued on + subsequent Login Responses); otherwise, it indicates that this Login + Response ends a set of key=value pairs. A Login Response with the C + bit set to 1 MUST have the T bit set to 0. + +10.13.8. Login Parameters + + The target MUST provide some basic parameters in order to enable the + initiator to determine if it is connected to the correct port and the + initial text parameters for the security exchange. + + All the rules specified in Section 10.11.6 Text Response Data for + text responses also hold for Login Responses. Keys and their + explanations are listed in Chapter 11 (security negotiation keys) and + Chapter 12 (operational parameter negotiation keys). All keys in + Chapter 12, except for the X extension formats, MUST be supported by + iSCSI initiators and targets. Keys in Chapter 11, only need to be + supported when the function to which they refer is mandatory to + implement. + + + + +Satran, et al. Standards Track [Page 164] + +RFC 3720 iSCSI April 2004 + + +10.14. Logout Request + + The Logout Request is used to perform a controlled closing of a + connection. + + An initiator MAY use a Logout Request to remove a connection from a + session or to close an entire session. + + After sending the Logout Request PDU, an initiator MUST NOT send any + new iSCSI requests on the closing connection. If the Logout Request + is intended to close the session, new iSCSI requests MUST NOT be sent + on any of the connections participating in the session. + + When receiving a Logout Request with the reason code of "close the + connection" or "close the session", the target MUST terminate all + pending commands, whether acknowledged via ExpCmdSN or not, on that + connection or session respectively. + + When receiving a Logout Request with the reason code "remove + connection for recovery", the target MUST discard all requests not + yet acknowledged via ExpCmdSN that were issued on the specified + connection, and suspend all data/status/R2T transfers on behalf of + pending commands on the specified connection. + + The target then issues the Logout Response and half-closes the TCP + connection (sends FIN). After receiving the Logout Response and + attempting to receive the FIN (if still possible), the initiator MUST + completely close the logging-out connection. For the terminated + commands, no additional responses should be expected. + + A Logout for a CID may be performed on a different transport + connection when the TCP connection for the CID has already been + terminated. In such a case, only a logical "closing" of the iSCSI + connection for the CID is implied with a Logout. + + All commands that were not terminated or not completed (with status) + and acknowledged when the connection is closed completely can be + reassigned to a new connection if the target supports connection + recovery. + + If an initiator intends to start recovery for a failing connection, + it MUST use the Logout Request to "clean-up" the target end of a + failing connection and enable recovery to start, or the Login Request + with a non-zero TSIH and the same CID on a new connection for the + same effect (see Section 10.14.3 CID). In sessions with a single + connection, the connection can be closed and then a new connection + reopened. A connection reinstatement login can be used for recovery + (see Section 5.3.4 Connection Reinstatement). + + + +Satran, et al. Standards Track [Page 165] + +RFC 3720 iSCSI April 2004 + + + A successful completion of a Logout Request with the reason code of + "close the connection" or "remove the connection for recovery" + results at the target in the discarding of unacknowledged commands + received on the connection being logged out. These are commands that + have arrived on the connection being logged out, but have not been + delivered to SCSI because one or more commands with a smaller CmdSN + has not been received by iSCSI. See Section 3.2.2.1 Command + Numbering and Acknowledging. The resulting holes the in command + sequence numbers will have to be handled by appropriate recovery (see + Chapter 6) unless the session is also closed. + + The entire logout discussion in this section is also applicable for + an implicit Logout realized via a connection reinstatement or session + reinstatement. When a Login Request performs an implicit Logout, the + implicit Logout is performed as if having the reason codes specified + below: + + Reason code Type of implicit Logout + ------------------------------------------- + 0 session reinstatement + 1 connection reinstatement when + the operational ErrorRecoveryLevel < 2 + 2 connection reinstatement when + the operational ErrorRecoveryLevel = 2 + + + + + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 166] + +RFC 3720 iSCSI April 2004 + + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|I| 0x06 |1| Reason Code | Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------------------------------------------------------+ + 8/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| CID or Reserved | Reserved | + +---------------+---------------+---------------+---------------+ + 24| CmdSN | + +---------------+---------------+---------------+---------------+ + 28| ExpStatSN | + +---------------+---------------+---------------+---------------+ + 32/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + +10.14.1. Reason Code + + Reason Code indicates the reason for Logout as follows: + + 0 - close the session. All commands associated with the session + (if any) are terminated. + + 1 - close the connection. All commands associated with connection + (if any) are terminated. + + 2 - remove the connection for recovery. Connection is closed and + all commands associated with it, if any, are to be prepared + for a new allegiance. + + All other values are reserved. + + + + + + + + + + + +Satran, et al. Standards Track [Page 167] + +RFC 3720 iSCSI April 2004 + + +10.14.2. TotalAHSLength and DataSegmentLength + + For this PDU TotalAHSLength and DataSegmentLength MUST be 0. + +10.14.3. CID + + This is the connection ID of the connection to be closed (including + closing the TCP stream). This field is only valid if the reason code + is not "close the session". + +10.14.4. ExpStatSN + + This is the last ExpStatSN value for the connection to be closed. + +10.14.5. Implicit termination of tasks + + A target implicitly terminates the active tasks due to the iSCSI + protocol in the following cases: + + a) When a connection is implicitly or explicitly logged out with + the reason code of "Close the connection" and there are active + tasks allegiant to that connection. + + b) When a connection fails and eventually the connection state + times out (state transition M1 in Section 7.2.2 State + Transition Descriptions for Initiators and Targets) and there + are active tasks allegiant to that connection. + + c) When a successful recovery Logout is performed while there are + active tasks allegiant to that connection, and those tasks + eventually time out after the Time2Wait and Time2Retain + periods without allegiance reassignment. + + d) When a connection is implicitly or explicitly logged out with + the reason code of "Close the session" and there are active + tasks in that session. + + If the tasks terminated in any of the above cases are SCSI tasks, + they must be internally terminated as if with CHECK CONDITION status. + This status is only meaningful for appropriately handling the + internal SCSI state and SCSI side effects with respect to ordering + because this status is never communicated back as a terminating + status to the initiator. However additional actions may have to be + taken at SCSI level depending on the SCSI context as defined by the + SCSI standards (e.g., queued commands and ACA, in cases a), b), and + c), after the tasks are terminated, the target MUST report a Unit + Attention condition on the next command processed on any connection + for each affected I_T_L nexus with the status of CHECK CONDITION, and + + + +Satran, et al. Standards Track [Page 168] + +RFC 3720 iSCSI April 2004 + + + the ASC/ASCQ value of 47h/7Fh - "SOME COMMANDS CLEARED BY ISCSI + PROTOCOL EVENT" - etc. - see [SAM2] and [SPC3]). + +10.15. Logout Response + + The Logout Response is used by the target to indicate if the cleanup + operation for the connection(s) has completed. + + After Logout, the TCP connection referred by the CID MUST be closed + at both ends (or all connections must be closed if the logout reason + was session close). + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x26 |1| Reserved | Response | Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------------------------------------------------------+ + 8/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag | + +---------------+---------------+---------------+---------------+ + 20| Reserved | + +---------------+---------------+---------------+---------------+ + 24| StatSN | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36| Reserved | + +---------------------------------------------------------------+ + 40| Time2Wait | Time2Retain | + +---------------+---------------+---------------+---------------+ + 44| Reserved | + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + + + + + + + + + +Satran, et al. Standards Track [Page 169] + +RFC 3720 iSCSI April 2004 + + +10.15.1. Response + + Logout Response: + + 0 - connection or session closed successfully. + + 1 - CID not found. + + 2 - connection recovery is not supported. If Logout reason code + was recovery and target does not support it as indicated by the + ErrorRecoveryLevel. + + 3 - cleanup failed for various reasons. + +10.15.2. TotalAHSLength and DataSegmentLength + + For this PDU TotalAHSLength and DataSegmentLength MUST be 0. + +10.15.3. Time2Wait + + If the Logout Response code is 0 and if the operational + ErrorRecoveryLevel is 2, this is the minimum amount of time, in + seconds, to wait before attempting task reassignment. If the Logout + Response code is 0 and if the operational ErrorRecoveryLevel is less + than 2, this field is to be ignored. + + This field is invalid if the Logout Response code is 1. + + If the Logout response code is 2 or 3, this field specifies the + minimum time to wait before attempting a new implicit or explicit + logout. + + If Time2Wait is 0, the reassignment or a new Logout may be attempted + immediately. + +10.15.4. Time2Retain + + If the Logout response code is 0 and if the operational + ErrorRecoveryLevel is 2, this is the maximum amount of time, in + seconds, after the initial wait (Time2Wait), the target waits for the + allegiance reassignment for any active task after which the task + state is discarded. If the Logout response code is 0 and if the + operational ErrorRecoveryLevel is less than 2, this field is to be + ignored. + + This field is invalid if the Logout response code is 1. + + + + + +Satran, et al. Standards Track [Page 170] + +RFC 3720 iSCSI April 2004 + + + If the Logout response code is 2 or 3, this field specifies the + maximum amount of time, in seconds, after the initial wait + (Time2Wait), the target waits for a new implicit or explicit logout. + + If it is the last connection of a session, the whole session state is + discarded after Time2Retain. + + If Time2Retain is 0, the target has already discarded the connection + (and possibly the session) state along with the task states. No + reassignment or Logout is required in this case. + +10.16. SNACK Request + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x10 |1|.|.|.| Type | Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN or Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 20| Target Transfer Tag or SNACK Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 24| Reserved | + +---------------+---------------+---------------+---------------+ + 28| ExpStatSN | + +---------------+---------------+---------------+---------------+ + 32/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 40| BegRun | + +---------------------------------------------------------------+ + 44| RunLength | + +---------------------------------------------------------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + If the implementation supports ErrorRecoveryLevel greater than zero, + it MUST support all SNACK types. + + + + + + +Satran, et al. Standards Track [Page 171] + +RFC 3720 iSCSI April 2004 + + + The SNACK is used by the initiator to request the retransmission of + numbered-responses, data, or R2T PDUs from the target. The SNACK + request indicates the numbered-responses or data "runs" whose + retransmission is requested by the target, where the run starts with + the first StatSN, DataSN, or R2TSN whose retransmission is requested + and indicates the number of Status, Data, or R2T PDUs requested + including the first. 0 has special meaning when used as a starting + number and length: + + - When used in RunLength, it means all PDUs starting with the + initial. + - When used in both BegRun and RunLength, it means all + unacknowledged PDUs. + + The numbered-response(s) or R2T(s), requested by a SNACK, MUST be + delivered as exact replicas of the ones that the target transmitted + originally except for the fields ExpCmdSN, MaxCmdSN, and ExpDataSN, + which MUST carry the current values. R2T(s)requested by SNACK MUST + also carry the current value of StatSN. + + The numbered Data-In PDUs, requested by a Data SNACK MUST be + delivered as exact replicas of the ones that the target transmitted + originally except for the fields ExpCmdSN and MaxCmdSN, which MUST + carry the current values and except for resegmentation (see Section + 10.16.3 Resegmentation). + + Any SNACK that requests a numbered-response, Data, or R2T that was + not sent by the target or was already acknowledged by the initiator, + MUST be rejected with a reason code of "Protocol error". + +10.16.1. Type + + This field encodes the SNACK function as follows: + + 0-Data/R2T SNACK - requesting retransmission of one or more Data- + In or R2T PDUs. + + 1-Status SNACK - requesting retransmission of one or more numbered + responses. + + 2-DataACK - positively acknowledges Data-In PDUs. + + 3-R-Data SNACK - requesting retransmission of Data-In PDUs with + possible resegmentation and status tagging. + + + + + + + +Satran, et al. Standards Track [Page 172] + +RFC 3720 iSCSI April 2004 + + + All other values are reserved. + + Data/R2T SNACK, Status SNACK, or R-Data SNACK for a command MUST + precede status acknowledgement for the given command. + +10.16.2. Data Acknowledgement + + If an initiator operates at ErrorRecoveryLevel 1 or higher, it MUST + issue a SNACK of type DataACK after receiving a Data-In PDU with the + A bit set to 1. However, if the initiator has detected holes in the + input sequence, it MUST postpone issuing the SNACK of type DataACK + until the holes are filled. An initiator MAY ignore the A bit if it + deems that the bit is being set aggressively by the target (i.e., + before the MaxBurstLength limit is reached). + + The DataACK is used to free resources at the target and not to + request or imply data retransmission. + + An initiator MUST NOT request retransmission for any data it had + already acknowledged. + +10.16.3. Resegmentation + + If the initiator MaxRecvDataSegmentLength changed between the + original transmission and the time the initiator requests + retransmission, the initiator MUST issue a R-Data SNACK (see Section + 10.16.1 Type). With R-Data SNACK, the initiator indicates that it + discards all the unacknowledged data and expects the target to resend + it. It also expects resegmentation. In this case, the retransmitted + Data-In PDUs MAY be different from the ones originally sent in order + to reflect changes in MaxRecvDataSegmentLength. Their DataSN starts + with the BegRun of the last DataACK received by the target if any was + received; otherwise it starts with 0 and is increased by 1 for each + resent Data-In PDU. + + A target that has received a R-Data SNACK MUST return a SCSI Response + that contains a copy of the SNACK Tag field from the R-Data SNACK in + the SCSI Response SNACK Tag field as its last or only Response. For + example, if it has already sent a response containing another value + in the SNACK Tag field or had the status included in the last Data-In + PDU, it must send a new SCSI Response PDU. If a target sends more + than one SCSI Response PDU due to this rule, all SCSI responses must + carry the same StatSN (see Section 10.4.4 SNACK Tag). If an + initiator attempts to recover a lost SCSI Response (with a + Status SNACK, see Section 10.16.1 Type) when more than one response + has been sent, the target will send the SCSI Response with the latest + content known to the target, including the last SNACK Tag for the + command. + + + +Satran, et al. Standards Track [Page 173] + +RFC 3720 iSCSI April 2004 + + + For considerations in allegiance reassignment of a task to a + connection with a different MaxRecvDataSegmentLength, refer to + Section 6.2.2 Allegiance Reassignment. + +10.16.4. Initiator Task Tag + + For Status SNACK and DataACK, the Initiator Task Tag MUST be set to + the reserved value 0xffffffff. In all other cases, the Initiator + Task Tag field MUST be set to the Initiator Task Tag of the + referenced command. + +10.16.5. Target Transfer Tag or SNACK Tag + + For an R-Data SNACK, this field MUST contain a value that is + different from 0 or 0xffffffff and is unique for the task (identified + by the Initiator Task Tag). This value MUST be copied by the iSCSI + target in the last or only SCSI Response PDU it issues for the + command. + + For DataACK, the Target Transfer Tag MUST contain a copy of the + Target Transfer Tag and LUN provided with the SCSI Data-In PDU with + the A bit set to 1. + + In all other cases, the Target Transfer Tag field MUST be set to the + reserved value of 0xffffffff. + +10.16.6. BegRun + + The DataSN, R2TSN, or StatSN of the first PDU whose retransmission is + requested (Data/R2T and Status SNACK), or the next expected DataSN + (DataACK SNACK). + + BegRun 0 when used in conjunction with RunLength 0 means resend all + unacknowledged Data-In, R2T or Response PDUs. + + BegRun MUST be 0 for a R-Data SNACK. + +10.16.7. RunLength + + The number of PDUs whose retransmission is requested. + + RunLength 0 signals that all Data-In, R2T, or Response PDUs carrying + the numbers equal to or greater than BegRun have to be resent. + + The RunLength MUST also be 0 for a DataACK SNACK in addition to + R-Data SNACK. + + + + + +Satran, et al. Standards Track [Page 174] + +RFC 3720 iSCSI April 2004 + + +10.17. Reject + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x3f |1| Reserved | Reason | Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 16| 0xffffffff | + +---------------+---------------+---------------+---------------+ + 20| Reserved | + +---------------+---------------+---------------+---------------+ + 24| StatSN | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36| DataSN/R2TSN or Reserved | + +---------------+---------------+---------------+---------------+ + 40| Reserved | + +---------------+---------------+---------------+---------------+ + 44| Reserved | + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + xx/ Complete Header of Bad PDU / + +/ / + +---------------+---------------+---------------+---------------+ + yy/Vendor specific data (if any) / + / / + +---------------+---------------+---------------+---------------+ + zz| Data-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + Reject is used to indicate an iSCSI error condition (protocol, + unsupported option, etc.). + + + + + + + + + +Satran, et al. Standards Track [Page 175] + +RFC 3720 iSCSI April 2004 + + +10.17.1. Reason + + The reject Reason is coded as follows: + + +------+----------------------------------------+------------------+ + | Code | Explanation | Can the original | + | (hex)| | PDU be re-sent? | + +------+----------------------------------------+------------------+ + | 0x01 | Reserved | no | + | | | | + | 0x02 | Data (payload) Digest Error | yes (Note 1) | + | | | | + | 0x03 | SNACK Reject | yes | + | | | | + | 0x04 | Protocol Error (e.g., SNACK request for| no | + | | a status that was already acknowledged)| | + | | | | + | 0x05 | Command not supported | no | + | | | | + | 0x06 | Immediate Command Reject - too many | yes | + | | immediate commands | | + | | | | + | 0x07 | Task in progress | no | + | | | | + | 0x08 | Invalid Data ACK | no | + | | | | + | 0x09 | Invalid PDU field | no (Note 2) | + | | | | + | 0x0a | Long Operation Reject - Can't generate | yes | + | | Target Transfer Tag - out of resources | | + | | | | + | 0x0b | Negotiation Reset | no | + | | | | + | 0x0c | Waiting for Logout | no | + +------+----------------------------------------+------------------+ + + Note 1: For iSCSI, Data-Out PDU retransmission is only done if the + target requests retransmission with a recovery R2T. However, if this + is the data digest error on immediate data, the initiator may choose + to retransmit the whole PDU including the immediate data. + + Note 2: A target should use this reason code for all invalid values + of PDU fields that are meant to describe a task, a response, or a + data transfer. Some examples are invalid TTT/ITT, buffer offset, LUN + qualifying a TTT, and an invalid sequence number in a SNACK. + + All other values for Reason are reserved. + + + + +Satran, et al. Standards Track [Page 176] + +RFC 3720 iSCSI April 2004 + + + In all the cases in which a pre-instantiated SCSI task is terminated + because of the reject, the target MUST issue a proper SCSI command + response with CHECK CONDITION as described in Section 10.4.3 + Response. In these cases in which a status for the SCSI task was + already sent before the reject, no additional status is required. If + the error is detected while data from the initiator is still expected + (i.e., the command PDU did not contain all the data and the target + has not received a Data-Out PDU with the Final bit set to 1 for the + unsolicited data, if any, and all outstanding R2Ts, if any), the + target MUST wait until it receives the last expected Data-Out PDUs + with the F bit set to 1 before sending the Response PDU. + + For additional usage semantics of Reject PDU, see Section 6.3 Usage + Of Reject PDU in Recovery. + +10.17.2. DataSN/R2TSN + + This field is only valid if the rejected PDU is a Data/R2T SNACK and + the Reject reason code is "Protocol error" (see Section 10.16 SNACK + Request). The DataSN/R2TSN is the next Data/R2T sequence number that + the target would send for the task, if any. + +10.17.3. StatSN, ExpCmdSN and MaxCmdSN + + These fields carry their usual values and are not related to the + rejected command. StatSN is advanced after a Reject. + +10.17.4. Complete Header of Bad PDU + + The target returns the header (not including digest) of the PDU in + error as the data of the response. + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 177] + +RFC 3720 iSCSI April 2004 + + +10.18. NOP-Out + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|I| 0x00 |1| Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN or Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 20| Target Transfer Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 24| CmdSN | + +---------------+---------------+---------------+---------------+ + 28| ExpStatSN | + +---------------+---------------+---------------+---------------+ + 32/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + / DataSegment - Ping Data (optional) / + +/ / + +---------------+---------------+---------------+---------------+ + | Data-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + A NOP-Out may be used by an initiator as a "ping request" to verify + that a connection/session is still active and all its components are + operational. The NOP-In response is the "ping echo". + + A NOP-Out is also sent by an initiator in response to a NOP-In. + + A NOP-Out may also be used to confirm a changed ExpStatSN if another + PDU will not be available for a long time. + + Upon receipt of a NOP-In with the Target Transfer Tag set to a valid + value (not the reserved 0xffffffff), the initiator MUST respond with + a NOP-Out. In this case, the NOP-Out Target Transfer Tag MUST + contain a copy of the NOP-In Target Transfer Tag. + + + + + +Satran, et al. Standards Track [Page 178] + +RFC 3720 iSCSI April 2004 + + +10.18.1. Initiator Task Tag + + The NOP-Out MUST have the Initiator Task Tag set to a valid value + only if a response in the form of NOP-In is requested (i.e., the + NOP-Out is used as a ping request). Otherwise, the Initiator Task + Tag MUST be set to 0xffffffff. + + When a target receives the NOP-Out with a valid Initiator Task Tag, + it MUST respond with a Nop-In Response (see Section 10.19 NOP-In). + + If the Initiator Task Tag contains 0xffffffff, the I bit MUST be set + to 1 and the CmdSN is not advanced after this PDU is sent. + +10.18.2. Target Transfer Tag + + A target assigned identifier for the operation. + + The NOP-Out MUST only have the Target Transfer Tag set if it is + issued in response to a NOP-In with a valid Target Transfer Tag. In + this case, it copies the Target Transfer Tag from the NOP-In PDU. + Otherwise, the Target Transfer Tag MUST be set to 0xffffffff. + + When the Target Transfer Tag is set to a value other than 0xffffffff, + the LUN field MUST also be copied from the NOP-In. + +10.18.3. Ping Data + + Ping data are reflected in the NOP-In Response. The length of the + reflected data are limited to MaxRecvDataSegmentLength. The length + of ping data are indicated by the DataSegmentLength. 0 is a valid + value for the DataSegmentLength and indicates the absence of ping + data. + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 179] + +RFC 3720 iSCSI April 2004 + + +10.19. NOP-In + + Byte/ 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0|.|.| 0x20 |1| Reserved | + +---------------+---------------+---------------+---------------+ + 4|TotalAHSLength | DataSegmentLength | + +---------------+---------------+---------------+---------------+ + 8| LUN or Reserved | + + + + 12| | + +---------------+---------------+---------------+---------------+ + 16| Initiator Task Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 20| Target Transfer Tag or 0xffffffff | + +---------------+---------------+---------------+---------------+ + 24| StatSN | + +---------------+---------------+---------------+---------------+ + 28| ExpCmdSN | + +---------------+---------------+---------------+---------------+ + 32| MaxCmdSN | + +---------------+---------------+---------------+---------------+ + 36/ Reserved / + +/ / + +---------------+---------------+---------------+---------------+ + 48| Header-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + / DataSegment - Return Ping Data / + +/ / + +---------------+---------------+---------------+---------------+ + | Data-Digest (Optional) | + +---------------+---------------+---------------+---------------+ + + NOP-In is either sent by a target as a response to a NOP-Out, as a + "ping" to an initiator, or as a means to carry a changed ExpCmdSN + and/or MaxCmdSN if another PDU will not be available for a long time + (as determined by the target). + + When a target receives the NOP-Out with a valid Initiator Task Tag + (not the reserved value 0xffffffff), it MUST respond with a NOP-In + with the same Initiator Task Tag that was provided in the NOP-Out + request. It MUST also duplicate up to the first + MaxRecvDataSegmentLength bytes of the initiator provided Ping Data. + For such a response, the Target Transfer Tag MUST be 0xffffffff. + + + + + +Satran, et al. Standards Track [Page 180] + +RFC 3720 iSCSI April 2004 + + + Otherwise, when a target sends a NOP-In that is not a response to a + Nop-Out received from the initiator, the Initiator Task Tag MUST be + set to 0xffffffff and the Data Segment MUST NOT contain any data + (DataSegmentLength MUST be 0). + +10.19.1. Target Transfer Tag + + If the target is responding to a NOP-Out, this is set to the reserved + value 0xffffffff. + + If the target is sending a NOP-In as a Ping (intending to receive a + corresponding NOP-Out), this field is set to a valid value (not the + reserved 0xffffffff). + + If the target is initiating a NOP-In without wanting to receive a + corresponding NOP-Out, this field MUST hold the reserved value of + 0xffffffff. + +10.19.2. StatSN + + The StatSN field will always contain the next StatSN. However, when + the Initiator Task Tag is set to 0xffffffff, StatSN for the + connection is not advanced after this PDU is sent. + +10.19.3. LUN + + A LUN MUST be set to a correct value when the Target Transfer Tag is + valid (not the reserved value 0xffffffff). + +11. iSCSI Security Text Keys and Authentication Methods + + Only the following keys are used during the SecurityNegotiation stage + of the Login Phase: + + SessionType + InitiatorName + TargetName + TargetAddress + InitiatorAlias + TargetAlias + TargetPortalGroupTag + AuthMethod and the keys used by the authentication methods + specified under Section 11.1 AuthMethod along with all of + their associated keys as well as Vendor Specific + Authentication Methods. + + + + + + +Satran, et al. Standards Track [Page 181] + +RFC 3720 iSCSI April 2004 + + + Other keys MUST NOT be used. + + SessionType, InitiatorName, TargetName, InitiatorAlias, TargetAlias, + and TargetPortalGroupTag are described in Chapter 12 as they can be + used also in the OperationalNegotiation stage. + + All security keys have connection-wide applicability. + +11.1. AuthMethod + + Use: During Login - Security Negotiation Senders: Initiator and + Target Scope: connection + + AuthMethod = <list-of-values> + + The main item of security negotiation is the authentication method + (AuthMethod). + + The authentication methods that can be used (appear in the + list-of-values) are either those listed in the following table or are + vendor-unique methods: + + +------------------------------------------------------------+ + | Name | Description | + +------------------------------------------------------------+ + | KRB5 | Kerberos V5 - defined in [RFC1510] | + +------------------------------------------------------------+ + | SPKM1 | Simple Public-Key GSS-API Mechanism | + | | defined in [RFC2025] | + +------------------------------------------------------------+ + | SPKM2 | Simple Public-Key GSS-API Mechanism | + | | defined in [RFC2025] | + +------------------------------------------------------------+ + | SRP | Secure Remote Password | + | | defined in [RFC2945] | + +------------------------------------------------------------+ + | CHAP | Challenge Handshake Authentication Protocol| + | | defined in [RFC1994] | + +------------------------------------------------------------+ + | None | No authentication | + +------------------------------------------------------------+ + + The AuthMethod selection is followed by an "authentication exchange" + specific to the authentication method selected. + + The authentication method proposal may be made by either the + initiator or the target. However the initiator MUST make the first + step specific to the selected authentication method as soon as it is + + + +Satran, et al. Standards Track [Page 182] + +RFC 3720 iSCSI April 2004 + + + selected. It follows that if the target makes the authentication + method proposal the initiator sends the first keys(s) of the exchange + together with its authentication method selection. + + The authentication exchange authenticates the initiator to the + target, and optionally, the target to the initiator. Authentication + is OPTIONAL to use but MUST be supported by the target and initiator. + + The initiator and target MUST implement CHAP. All other + authentication methods are OPTIONAL. + + Private or public extension algorithms MAY also be negotiated for + authentication methods. Whenever a private or public extension + algorithm is part of the default offer (the offer made in absence of + explicit administrative action) the implementer MUST ensure that CHAP + is listed as an alternative in the default offer and "None" is not + part of the default offer. + + Extension authentication methods MUST be named using one of the + following two formats: + + a) Z-reversed.vendor.dns_name.do_something= + b) Z<#><IANA-registered-string>= + + Authentication methods named using the Z- format are used as private + extensions. Authentication methods named using the Z# format are + used as public extensions that must be registered with IANA and MUST + be described by an informational RFC. + + For all of the public or private extension authentication methods, + the method specific keys MUST conform to the format specified in + Section 5.1 Text Format for standard-label. + + To identify the vendor for private extension authentication methods, + we suggest you use the reversed DNS-name as a prefix to the proper + digest names. + + The part of digest-name following Z- and Z# MUST conform to the + format for standard-label specified in Section 5.1 Text Format. + + Support for public or private extension authentication methods is + OPTIONAL. + + The following subsections define the specific exchanges for each of + the standardized authentication methods. As mentioned earlier the + first step is always done by the initiator. + + + + + +Satran, et al. Standards Track [Page 183] + +RFC 3720 iSCSI April 2004 + + +11.1.1. Kerberos + + For KRB5 (Kerberos V5) [RFC1510] and [RFC1964], the initiator MUST + use: + + KRB_AP_REQ=<KRB_AP_REQ> + + where KRB_AP_REQ is the client message as defined in [RFC1510]. + + The default principal name assumed by an iSCSI initiator or target + (prior to any administrative configuration action) MUST be the iSCSI + Initiator Name or iSCSI Target Name respectively, prefixed by the + string "iscsi/". + + If the initiator authentication fails, the target MUST respond with a + Login reject with "Authentication Failure" status. Otherwise, if the + initiator has selected the mutual authentication option (by setting + MUTUAL-REQUIRED in the ap-options field of the KRB_AP_REQ), the + target MUST reply with: + + KRB_AP_REP=<KRB_AP_REP> + + where KRB_AP_REP is the server's response message as defined in + [RFC1510]. + + If mutual authentication was selected and target authentication + fails, the initiator MUST close the connection. + + KRB_AP_REQ and KRB_AP_REP are binary-values and their binary length + (not the length of the character string that represents them in + encoded form) MUST not exceed 65536 bytes. + +11.1.2. Simple Public-Key Mechanism (SPKM) + + For SPKM1 and SPKM2 [RFC2025], the initiator MUST use: + + SPKM_REQ=<SPKM-REQ> + + where SPKM-REQ is the first initiator token as defined in [RFC2025]. + + [RFC2025] defines situations where each side may send an error token + that may cause the peer to re-generate and resend its last token. + This scheme is followed in iSCSI, and the error token syntax is: + + SPKM_ERROR=<SPKM-ERROR> + + + + + + +Satran, et al. Standards Track [Page 184] + +RFC 3720 iSCSI April 2004 + + + However, SPKM-DEL tokens that are defined by [RFC2025] for fatal + errors will not be used by iSCSI. If the target needs to send a + SPKM-DEL token, it will, instead, send a Login "login reject" message + with the "Authentication Failure" status and terminate the + connection. If the initiator needs to send a SPKM-DEL token, it will + close the connection. + + In the following sections, we assume that no SPKM-ERROR tokens are + required. + + If the initiator authentication fails, the target MUST return an + error. Otherwise, if the AuthMethod is SPKM1 or if the initiator has + selected the mutual authentication option (by setting mutual-state + bit in the options field of the REQ-TOKEN in the SPKM-REQ), the + target MUST reply with: + + SPKM_REP_TI=<SPKM-REP-TI> + + where SPKM-REP-TI is the target token as defined in [RFC2025]. + + If mutual authentication was selected and target authentication + fails, the initiator MUST close the connection. Otherwise, if the + AuthMethod is SPKM1, the initiator MUST continue with: + + SPKM_REP_IT=<SPKM-REP-IT> + + where SPKM-REP-IT is the second initiator token as defined in + [RFC2025]. If the initiator authentication fails, the target MUST + answer with a Login reject with "Authentication Failure" status. + + SPKM requires support for very long authentication items. + + All the SPKM-* tokens are binary-values and their binary length (not + the length of the character string that represents them in encoded + form) MUST not exceed 65536 bytes. + +11.1.3. Secure Remote Password (SRP) + + For SRP [RFC2945], the initiator MUST use: + + SRP_U=<U> TargetAuth=Yes /* or TargetAuth=No */ + + The target MUST answer with a Login reject with the "Authorization + Failure" status or reply with: + + SRP_GROUP=<G1,G2...> SRP_s=<s> + + Where G1,G2... are proposed groups, in order of preference. + + + +Satran, et al. Standards Track [Page 185] + +RFC 3720 iSCSI April 2004 + + + The initiator MUST either close the connection or continue with: + + SRP_A=<A> SRP_GROUP=<G> + + Where G is one of G1,G2... that were proposed by the target. + + The target MUST answer with a Login reject with the "Authentication + Failure" status or reply with: + + SRP_B=<B> + + The initiator MUST close the connection or continue with: + + SRP_M=<M> + + If the initiator authentication fails, the target MUST answer with a + Login reject with "Authentication Failure" status. Otherwise, if the + initiator sent TargetAuth=Yes in the first message (requiring target + authentication), the target MUST reply with: + + SRP_HM=<H(A | M | K)> + + If the target authentication fails, the initiator MUST close the + connection. + + Where U, s, A, B, M, and H(A | M | K) are defined in [RFC2945] (using + the SHA1 hash function, such as SRP-SHA1) and G,Gn (Gn stands for + G1,G2...) are identifiers of SRP groups specified in [RFC3723]. G, + Gn, and U are text strings, s,A,B,M, and H(A | M | K) are + binary-values. The length of s,A,B,M and H(A | M | K) in binary form + (not the length of the character string that represents them in + encoded form) MUST not exceed 1024 bytes. + + For the SRP_GROUP, all the groups specified in [RFC3723] up to 1536 + bits (i.e., SRP-768, SRP-1024, SRP-1280, SRP-1536) must be supported + by initiators and targets. To guarantee interoperability, targets + MUST always offer "SRP-1536" as one of the proposed groups. + +11.1.4. Challenge Handshake Authentication Protocol (CHAP) + + For CHAP [RFC1994], in the first step, the initiator MUST send: + + CHAP_A=<A1,A2...> + + Where A1,A2... are proposed algorithms, in order of preference. + + + + + + +Satran, et al. Standards Track [Page 186] + +RFC 3720 iSCSI April 2004 + + + In the second step, the target MUST answer with a Login reject with + the "Authentication Failure" status or reply with: + + CHAP_A=<A> CHAP_I=<I> CHAP_C=<C> + + Where A is one of A1,A2... that were proposed by the initiator. + + In the third step, the initiator MUST continue with: + + CHAP_N=<N> CHAP_R=<R> + + or, if it requires target authentication, with: + + CHAP_N=<N> CHAP_R=<R> CHAP_I=<I> CHAP_C=<C> + + If the initiator authentication fails, the target MUST answer with a + Login reject with "Authentication Failure" status. Otherwise, if the + initiator required target authentication, the target MUST either + answer with a Login reject with "Authentication Failure" or reply + with: + + CHAP_N=<N> CHAP_R=<R> + + If target authentication fails, the initiator MUST close the + connection. + + Where N, (A,A1,A2), I, C, and R are (correspondingly) the Name, + Algorithm, Identifier, Challenge, and Response as defined in + [RFC1994], N is a text string, A,A1,A2, and I are numbers, and C and + R are large-binary-values and their binary length (not the length of + the character string that represents them in encoded form) MUST not + exceed 1024 bytes. + + For the Algorithm, as stated in [RFC1994], one value is required to + be implemented: + + 5 (CHAP with MD5) + + To guarantee interoperability, initiators MUST always offer it as one + of the proposed algorithms. + +12. Login/Text Operational Text Keys + + Some session specific parameters MUST only be carried on the leading + connection and cannot be changed after the leading connection login + (e.g., MaxConnections, the maximum number of connections). This + + + + + +Satran, et al. Standards Track [Page 187] + +RFC 3720 iSCSI April 2004 + + + holds for a single connection session with regard to connection + restart. The keys that fall into this category have the use: LO + (Leading Only). + + Keys that can only be used during login have the use: IO (initialize + only), while those that can be used in both the Login Phase and Full + Feature Phase have the use: ALL. + + Keys that can only be used during Full Feature Phase use FFPO (Full + Feature Phase only). + + Keys marked as Any-Stage may also appear in the SecurityNegotiation + stage while all other keys described in this chapter are operational + keys. + + Keys that do not require an answer are marked as Declarative. + + Key scope is indicated as session-wide (SW) or connection-only (CO). + + Result function, wherever mentioned, states the function that can be + applied to check the validity of the responder selection. Minimum + means that the selected value cannot exceed the offered value. + Maximum means that the selected value cannot be lower than the + offered value. AND means that the selected value must be a possible + result of a Boolean "and" function with an arbitrary Boolean value + (e.g., if the offered value is No the selected value must be No). OR + means that the selected value must be a possible result of a Boolean + "or" function with an arbitrary Boolean value (e.g., if the offered + value is Yes the selected value must be Yes). + +12.1. HeaderDigest and DataDigest + + Use: IO + Senders: Initiator and Target + Scope: CO + + HeaderDigest = <list-of-values> + DataDigest = <list-of-values> + + Default is None for both HeaderDigest and DataDigest. + + Digests enable the checking of end-to-end, non-cryptographic data + integrity beyond the integrity checks provided by the link layers and + the covering of the whole communication path including all elements + that may change the network level PDUs such as routers, switches, and + proxies. + + + + + +Satran, et al. Standards Track [Page 188] + +RFC 3720 iSCSI April 2004 + + + The following table lists cyclic integrity checksums that can be + negotiated for the digests and that MUST be implemented by every + iSCSI initiator and target. These digest options only have error + detection significance. + + +---------------------------------------------+ + | Name | Description | Generator | + +---------------------------------------------+ + | CRC32C | 32 bit CRC |0x11edc6f41| + +---------------------------------------------+ + | None | no digest | + +---------------------------------------------+ + + The generator polynomial for this digest is given in + hex-notation (e.g., 0x3b stands for 0011 1011 and the polynomial is + x**5+X**4+x**3+x+1). + + When the Initiator and Target agree on a digest, this digest MUST be + used for every PDU in Full Feature Phase. + + Padding bytes, when present in a segment covered by a CRC, SHOULD be + set to 0 and are included in the CRC. + + The CRC MUST be calculated by a method that produces the same + results as the following process: + + - The PDU bits are considered as the coefficients of a + polynomial M(x) of degree n-1; bit 7 of the lowest numbered + byte is considered the most significant bit (x^n-1), followed + by bit 6 of the lowest numbered byte through bit 0 of the + highest numbered byte (x^0). + + - The most significant 32 bits are complemented. + + - The polynomial is multiplied by x^32 then divided by G(x). The + generator polynomial produces a remainder R(x) of degree <= 31. + + - The coefficients of R(x) are considered a 32 bit sequence. + + - The bit sequence is complemented and the result is the CRC. + + - The CRC bits are mapped into the digest word. The x^31 + coefficient in bit 7 of the lowest numbered byte of the digest + continuing through to the byte up to the x^24 coefficient in + bit 0 of the lowest numbered byte, continuing with the x^23 + coefficient in bit 7 of next byte through x^0 in bit 0 of the + highest numbered byte. + + + + +Satran, et al. Standards Track [Page 189] + +RFC 3720 iSCSI April 2004 + + + - Computing the CRC over any segment (data or header) extended + to include the CRC built using the generator 0x11edc6f41 will + always get the value 0x1c2d19ed as its final remainder (R(x)). + This value is given here in its polynomial form (i.e., not + mapped as the digest word). + + For a discussion about selection criteria for the CRC, see + [RFC3385]. For a detailed analysis of the iSCSI polynomial, see + [Castagnoli93]. + + Private or public extension algorithms MAY also be negotiated for + digests. Whenever a private or public digest extension algorithm is + part of the default offer (the offer made in absence of explicit + administrative action) the implementer MUST ensure that CRC32C is + listed as an alternative in the default offer and "None" is not + part of the default offer. + + Extension digest algorithms MUST be named using one of the following + two formats: + + a) Y-reversed.vendor.dns_name.do_something= + b) Y<#><IANA-registered-string>= + + Digests named using the Y- format are used for private purposes + (unregistered). Digests named using the Y# format (public extension) + must be registered with IANA and MUST be described by an + informational RFC. + + For private extension digests, to identify the vendor, we suggest + you use the reversed DNS-name as a prefix to the proper digest + names. + + The part of digest-name following Y- and Y# MUST conform to the + format for standard-label specified in Section 5.1 Text Format. + + Support for public or private extension digests is OPTIONAL. + +12.2. MaxConnections + + Use: LO + Senders: Initiator and Target + Scope: SW + Irrelevant when: SessionType=Discovery + + MaxConnections=<numerical-value-from-1-to-65535> + + Default is 1. + Result function is Minimum. + + + +Satran, et al. Standards Track [Page 190] + +RFC 3720 iSCSI April 2004 + + + + Initiator and target negotiate the maximum number of connections + requested/acceptable. + +12.3. SendTargets + + Use: FFPO + Senders: Initiator + Scope: SW + + For a complete description, see Appendix D. - SendTargets + Operation -. + +12.4. TargetName + + Use: IO by initiator, FFPO by target - only as response to a + SendTargets, Declarative, Any-Stage + + Senders: Initiator and Target + Scope: SW + + TargetName=<iSCSI-name-value> + + Examples: + + TargetName=iqn.1993-11.com.disk-vendor:diskarrays.sn.45678 + TargetName=eui.020000023B040506 + + The initiator of the TCP connection MUST provide this key to the + remote endpoint in the first login request if the initiator is not + establishing a discovery session. The iSCSI Target Name specifies + the worldwide unique name of the target. + + The TargetName key may also be returned by the "SendTargets" text + request (which is its only use when issued by a target). + + TargetName MUST not be redeclared within the login phase. + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 191] + +RFC 3720 iSCSI April 2004 + + +12.5. InitiatorName + + Use: IO, Declarative, Any-Stage + Senders: Initiator + Scope: SW + + InitiatorName=<iSCSI-name-value> + + Examples: + + InitiatorName=iqn.1992-04.com.os-vendor.plan9:cdrom.12345 + InitiatorName=iqn.2001-02.com.ssp.users:customer235.host90 + + The initiator of the TCP connection MUST provide this key to the + remote endpoint at the first Login of the Login Phase for every + connection. The InitiatorName key enables the initiator to identify + itself to the remote endpoint. + + InitiatorName MUST not be redeclared within the login phase. + +12.6. TargetAlias + + Use: ALL, Declarative, Any-Stage + Senders: Target + Scope: SW + + TargetAlias=<iSCSI-local-name-value> + + Examples: + + TargetAlias=Bob-s Disk + TargetAlias=Database Server 1 Log Disk + TargetAlias=Web Server 3 Disk 20 + + If a target has been configured with a human-readable name or + description, this name SHOULD be communicated to the initiator during + a Login Response PDU if SessionType=Normal (see Section 12.21 + SessionType). This string is not used as an identifier, nor is it + meant to be used for authentication or authorization decisions. It + can be displayed by the initiator's user interface in a list of + targets to which it is connected. + + + + + + + + + + +Satran, et al. Standards Track [Page 192] + +RFC 3720 iSCSI April 2004 + + +12.7. InitiatorAlias + + Use: ALL, Declarative, Any-Stage + Senders: Initiator + Scope: SW + + InitiatorAlias=<iSCSI-local-name-value> + + Examples: + + InitiatorAlias=Web Server 4 + InitiatorAlias=spyalley.nsa.gov + InitiatorAlias=Exchange Server + + If an initiator has been configured with a human-readable name or + description, it SHOULD be communicated to the target during a Login + Request PDU. If not, the host name can be used instead. This string + is not used as an identifier, nor is meant to be used for + authentication or authorization decisions. It can be displayed by + the target's user interface in a list of initiators to which it is + connected. + +12.8. TargetAddress + + Use: ALL, Declarative, Any-Stage + Senders: Target + Scope: SW + + TargetAddress=domainname[:port][,portal-group-tag] + + The domainname can be specified as either a DNS host name, a + dotted-decimal IPv4 address, or a bracketed IPv6 address as specified + in [RFC2732]. + + If the TCP port is not specified, it is assumed to be the + IANA-assigned default port for iSCSI (see Section 13 IANA + Considerations). + + If the TargetAddress is returned as the result of a redirect status + in a login response, the comma and portal group tag MUST be omitted. + + If the TargetAddress is returned within a SendTargets response, the + portal group tag MUST be included. + + + + + + + + +Satran, et al. Standards Track [Page 193] + +RFC 3720 iSCSI April 2004 + + + Examples: + + TargetAddress=10.0.0.1:5003,1 + TargetAddress=[1080:0:0:0:8:800:200C:417A],65 + TargetAddress=[1080::8:800:200C:417A]:5003,1 + TargetAddress=computingcenter.example.com,23 + + Use of the portal-group-tag is described in Appendix D. + - SendTargets Operation -. The formats for the port and + portal-group-tag are the same as the one specified in Section 12.9 + TargetPortalGroupTag. + +12.9. TargetPortalGroupTag + + Use: IO by target, Declarative, Any-Stage + Senders: Target + Scope: SW + + TargetPortalGroupTag=<16-bit-binary-value> + + Examples: + TargetPortalGroupTag=1 + + The target portal group tag is a 16-bit binary-value that uniquely + identifies a portal group within an iSCSI target node. This key + carries the value of the tag of the portal group that is servicing + the Login request. The iSCSI target returns this key to the + initiator in the Login Response PDU to the first Login Request PDU + that has the C bit set to 0 when TargetName is given by the + initiator. + + For the complete usage expectations of this key see Section 5.3 Login + Phase. + +12.10. InitialR2T + + Use: LO + Senders: Initiator and Target + Scope: SW + Irrelevant when: SessionType=Discovery + + InitialR2T=<boolean-value> + + Examples: + + I->InitialR2T=No + T->InitialR2T=No + + + + +Satran, et al. Standards Track [Page 194] + +RFC 3720 iSCSI April 2004 + + + Default is Yes. + Result function is OR. + + The InitialR2T key is used to turn off the default use of R2T for + unidirectional and the output part of bidirectional commands, thus + allowing an initiator to start sending data to a target as if it has + received an initial R2T with Buffer Offset=Immediate Data Length and + Desired Data Transfer Length=(min(FirstBurstLength, Expected Data + Transfer Length) - Received Immediate Data Length). + + The default action is that R2T is required, unless both the initiator + and the target send this key-pair attribute specifying InitialR2T=No. + Only the first outgoing data burst (immediate data and/or separate + PDUs) can be sent unsolicited (i.e., not requiring an explicit R2T). + +12.11. ImmediateData + + Use: LO + Senders: Initiator and Target + Scope: SW + Irrelevant when: SessionType=Discovery + + ImmediateData=<boolean-value> + + Default is Yes. + Result function is AND. + + The initiator and target negotiate support for immediate data. To + turn immediate data off, the initiator or target must state its + desire to do so. ImmediateData can be turned on if both the + initiator and target have ImmediateData=Yes. + + If ImmediateData is set to Yes and InitialR2T is set to Yes + (default), then only immediate data are accepted in the first burst. + + If ImmediateData is set to No and InitialR2T is set to Yes, then the + initiator MUST NOT send unsolicited data and the target MUST reject + unsolicited data with the corresponding response code. + + If ImmediateData is set to No and InitialR2T is set to No, then the + initiator MUST NOT send unsolicited immediate data, but MAY send one + unsolicited burst of Data-Out PDUs. + + If ImmediateData is set to Yes and InitialR2T is set to No, then the + initiator MAY send unsolicited immediate data and/or one unsolicited + burst of Data-Out PDUs. + + + + + +Satran, et al. Standards Track [Page 195] + +RFC 3720 iSCSI April 2004 + + + The following table is a summary of unsolicited data options: + + +----------+-------------+------------------+--------------+ + |InitialR2T|ImmediateData| Unsolicited |Immediate Data| + | | | Data Out PDUs | | + +----------+-------------+------------------+--------------+ + | No | No | Yes | No | + +----------+-------------+------------------+--------------+ + | No | Yes | Yes | Yes | + +----------+-------------+------------------+--------------+ + | Yes | No | No | No | + +----------+-------------+------------------+--------------+ + | Yes | Yes | No | Yes | + +----------+-------------+------------------+--------------+ + +12.12. MaxRecvDataSegmentLength + + Use: ALL, Declarative + Senders: Initiator and Target + Scope: CO + + MaxRecvDataSegmentLength=<numerical-value-512-to-(2**24-1)> + + Default is 8192 bytes. + + The initiator or target declares the maximum data segment length in + bytes it can receive in an iSCSI PDU. + + The transmitter (initiator or target) is required to send PDUs with a + data segment that does not exceed MaxRecvDataSegmentLength of the + receiver. + + A target receiver is additionally limited by MaxBurstLength for + solicited data and FirstBurstLength for unsolicited data. An + initiator MUST NOT send solicited PDUs exceeding MaxBurstLength nor + unsolicited PDUs exceeding FirstBurstLength (or + FirstBurstLength-Immediate Data Length if immediate data were sent). + +12.13. MaxBurstLength + + Use: LO + Senders: Initiator and Target + Scope: SW + Irrelevant when: SessionType=Discovery + + MaxBurstLength=<numerical-value-512-to-(2**24-1)> + + + + + +Satran, et al. Standards Track [Page 196] + +RFC 3720 iSCSI April 2004 + + + Default is 262144 (256 Kbytes). + Result function is Minimum. + + The initiator and target negotiate maximum SCSI data payload in bytes + in a Data-In or a solicited Data-Out iSCSI sequence. A sequence + consists of one or more consecutive Data-In or Data-Out PDUs that end + with a Data-In or Data-Out PDU with the F bit set to one. + +12.14. FirstBurstLength + + Use: LO + Senders: Initiator and Target + Scope: SW + Irrelevant when: SessionType=Discovery + Irrelevant when: ( InitialR2T=Yes and ImmediateData=No ) + + FirstBurstLength=<numerical-value-512-to-(2**24-1)> + + Default is 65536 (64 Kbytes). + Result function is Minimum. + + The initiator and target negotiate the maximum amount in bytes of + unsolicited data an iSCSI initiator may send to the target during the + execution of a single SCSI command. This covers the immediate data + (if any) and the sequence of unsolicited Data-Out PDUs (if any) that + follow the command. + + FirstBurstLength MUST NOT exceed MaxBurstLength. + +12.15. DefaultTime2Wait + + Use: LO + Senders: Initiator and Target + Scope: SW + + DefaultTime2Wait=<numerical-value-0-to-3600> + + Default is 2. + Result function is Maximum. + + The initiator and target negotiate the minimum time, in seconds, to + wait before attempting an explicit/implicit logout or an active task + reassignment after an unexpected connection termination or a + connection reset. + + A value of 0 indicates that logout or active task reassignment can be + attempted immediately. + + + + +Satran, et al. Standards Track [Page 197] + +RFC 3720 iSCSI April 2004 + + +12.16. DefaultTime2Retain + + Use: LO Senders: Initiator and Target Scope: SW + + DefaultTime2Retain=<numerical-value-0-to-3600> + + Default is 20. Result function is Minimum. + + The initiator and target negotiate the maximum time, in seconds after + an initial wait (Time2Wait), before which an active task reassignment + is still possible after an unexpected connection termination or a + connection reset. + + This value is also the session state timeout if the connection in + question is the last LOGGED_IN connection in the session. + + A value of 0 indicates that connection/task state is immediately + discarded by the target. + +12.17. MaxOutstandingR2T + + Use: LO + Senders: Initiator and Target + Scope: SW + + MaxOutstandingR2T=<numerical-value-from-1-to-65535> + Irrelevant when: SessionType=Discovery + + Default is 1. + Result function is Minimum. + + Initiator and target negotiate the maximum number of outstanding R2Ts + per task, excluding any implied initial R2T that might be part of + that task. An R2T is considered outstanding until the last data PDU + (with the F bit set to 1) is transferred, or a sequence reception + timeout (Section 6.1.4.1 Recovery Within-command) is encountered for + that data sequence. + +12.18. DataPDUInOrder + + Use: LO + Senders: Initiator and Target + Scope: SW + Irrelevant when: SessionType=Discovery + + DataPDUInOrder=<boolean-value> + + + + + +Satran, et al. Standards Track [Page 198] + +RFC 3720 iSCSI April 2004 + + + Default is Yes. + Result function is OR. + + No is used by iSCSI to indicate that the data PDUs within sequences + can be in any order. Yes is used to indicate that data PDUs within + sequences have to be at continuously increasing addresses and + overlays are forbidden. + +12.19. DataSequenceInOrder + + Use: LO + Senders: Initiator and Target + Scope: SW + Irrelevant when: SessionType=Discovery + + DataSequenceInOrder=<boolean-value> + + Default is Yes. + Result function is OR. + + A Data Sequence is a sequence of Data-In or Data-Out PDUs that end + with a Data-In or Data-Out PDU with the F bit set to one. A Data-Out + sequence is sent either unsolicited or in response to an R2T. + Sequences cover an offset-range. + + If DataSequenceInOrder is set to No, Data PDU sequences may be + transferred in any order. + + If DataSequenceInOrder is set to Yes, Data Sequences MUST be + transferred using continuously non-decreasing sequence offsets (R2T + buffer offset for writes, or the smallest SCSI Data-In buffer offset + within a read data sequence). + + If DataSequenceInOrder is set to Yes, a target may retry at most the + last R2T, and an initiator may at most request retransmission for the + last read data sequence. For this reason, if ErrorRecoveryLevel is + not 0 and DataSequenceInOrder is set to Yes then MaxOustandingR2T + MUST be set to 1. + +12.20. ErrorRecoveryLevel + + Use: LO + Senders: Initiator and Target + Scope: SW + + ErrorRecoveryLevel=<numerical-value-0-to-2> + + + + + +Satran, et al. Standards Track [Page 199] + +RFC 3720 iSCSI April 2004 + + + Default is 0. + Result function is Minimum. + + The initiator and target negotiate the recovery level supported. + + Recovery levels represent a combination of recovery capabilities. + Each recovery level includes all the capabilities of the lower + recovery levels and adds some new ones to them. + + In the description of recovery mechanisms, certain recovery classes + are specified. Section 6.1.5 Error Recovery Hierarchy describes the + mapping between the classes and the levels. + +12.21. SessionType + + Use: LO, Declarative, Any-Stage + Senders: Initiator + Scope: SW + + SessionType= <Discovery|Normal> + + Default is Normal. + + The initiator indicates the type of session it wants to create. The + target can either accept it or reject it. + + A discovery session indicates to the Target that the only purpose of + this Session is discovery. The only requests a target accepts in + this type of session are a text request with a SendTargets key and a + logout request with reason "close the session". + + The discovery session implies MaxConnections = 1 and overrides both + the default and an explicit setting. + +12.22. The Private or Public Extension Key Format + + Use: ALL + Senders: Initiator and Target + Scope: specific key dependent + + X-reversed.vendor.dns_name.do_something= + + or + + X<#><IANA-registered-string>= + + + + + + +Satran, et al. Standards Track [Page 200] + +RFC 3720 iSCSI April 2004 + + + Keys with this format are used for public or private extension + purposes. These keys always start with X- if unregistered with IANA + (private) or X# if registered with IANA (public). + + For unregistered keys, to identify the vendor, we suggest you use the + reversed DNS-name as a prefix to the key-proper. + + The part of key-name following X- and X# MUST conform to the format + for key-name specified in Section 5.1 Text Format. + + For IANA registered keys the string following X# must be registered + with IANA and the use of the key MUST be described by an + informational RFC. + + Vendor specific keys MUST ONLY be used in normal sessions. + + Support for public or private extension keys is OPTIONAL. + +13. IANA Considerations + + This section conforms to [RFC2434]. + + The well-known user TCP port number for iSCSI connections assigned by + IANA is 3260 and this is the default iSCSI port. Implementations + needing a system TCP port number may use port 860, the port assigned + by IANA as the iSCSI system port; however in order to use port 860, + it MUST be explicitly specified - implementations MUST NOT default to + use of port 860, as 3260 is the only allowed default. + + Extension keys, authentication methods, or digest types for which a + vendor or group of vendors intend to provide publicly available + descriptions MUST be described by an RFC and MUST be registered with + IANA. + + The IANA has set up the following three registries: + + a) iSCSI extended key registry + b) iSCSI authentication methods registry + c) iSCSI digests registry + + [RFC3723] also instructs IANA to maintain a registry for the values + of the SRP_GROUP key. The format of these values must conform to the + one specified for iSCSI extension item-label in Section 13.5.4 + Standard iSCSI extension item-label format. + + + + + + + +Satran, et al. Standards Track [Page 201] + +RFC 3720 iSCSI April 2004 + + + For the iSCSI authentication methods registry and the iSCSI digests + registry, IANA MUST also assign a 16-bit unsigned integer number (the + method number for the authentication method and the digest number for + the digest). + + The following initial values for the registry for authentication + methods are specified by the standards action of this document: + + Authentication Method | Number | + +----------------------------------------+--------+ + | CHAP | 1 | + +----------------------------------------+--------+ + | SRP | 2 | + +----------------------------------------+--------+ + | KRB5 | 3 | + +----------------------------------------+--------+ + | SPKM1 | 4 | + +----------------------------------------+--------+ + | SPKM2 | 5 | + +----------------------------------------+--------+ + + All other record numbers from 0 to 255 are reserved. IANA will + register numbers above 255. + + Authentication methods with numbers above 255 MUST be unique within + the registry and MUST be used with the prefix Z#. + + + The following initial values for the registry for digests are + specified by the standards action of this document: + + Digest | Number | + +----------------------------------------+--------+ + | CRC32C | 1 | + +----------------------------------------+--------+ + + All other record numbers from 0 to 255 are reserved. IANA will + register numbers above 255. + + Digests with numbers above 255 MUST be unique within the registry and + MUST be used with the prefix Y#. + + The RFC that describes the item to be registered MUST indicate in the + IANA Considerations section the string and iSCSI registry to which it + should be recorded. + + Extension Keys, Authentication Methods, and digests (iSCSI extension + items) must conform to a number of requirements as described below. + + + +Satran, et al. Standards Track [Page 202] + +RFC 3720 iSCSI April 2004 + + +13.1. Naming Requirements + + Each iSCSI extension item must have a unique name in its category. + This name will be used as a standard-label for the key, access + method, or digest and must conform to the syntax specified in Section + 13.5.4 Standard iSCSI extension item-label format for iSCSI extension + item-labels. + +13.2. Mechanism Specification Requirements + + For iSCSI extension items all of the protocols and procedures used by + a given iSCSI extension item must be described, either in the + specification of the iSCSI extension item itself or in some other + publicly available specification, in sufficient detail for the iSCSI + extension item to be implemented by any competent implementor. Use + of secret and/or proprietary methods in iSCSI extension items are + expressly prohibited. In addition, the restrictions imposed by + [RFC1602] on the standardization of patented algorithms must be + respected. + +13.3. Publication Requirements + + All iSCSI extension items must be described by an RFC. The RFC may + be informational rather than Standards-Track, although Standards + Track review and approval are encouraged for all iSCSI extension + items. + +13.4. Security Requirements + + Any known security issues that arise from the use of the iSCSI + extension item must be completely and fully described. It is not + required that the iSCSI extension item be secure or that it be free + from risks, but that the known risks be identified. Publication of a + new iSCSI extension item does not require an exhaustive security + review, and the security considerations section is subject to + continuing evaluation. + + Additional security considerations should be addressed by publishing + revised versions of the iSCSI extension item specification. + + For each of these registries, IANA must record the registered string, + which MUST conform to the format rules described in Section 13.5.4 + Standard iSCSI extension item-label format for iSCSI extension + item-labels, and the RFC number that describes it. The key prefix + (X#, Y# or Z#) is not part of the recorded string. + + + + + + +Satran, et al. Standards Track [Page 203] + +RFC 3720 iSCSI April 2004 + + +13.5. Registration Procedure + + Registration of a new iSCSI extension item starts with the + construction of an Internet Draft to become an RFC. + +13.5.1. Present the iSCSI extension item to the Community + + Send a proposed access type specification to the IPS WG mailing list, + or if the IPS WG is disbanded at the registration time, to a mailing + list designated by the IETF Transport Area Director for a review + period of a month. The intent of the public posting is to solicit + comments and feedback on the iSCSI extension item specification and a + review of any security considerations. + +13.5.2. iSCSI extension item review and IESG approval + + When the one month period has passed, the IPS WG chair or a person + nominated by the IETF Transport Area Director (the iSCSI extension + item reviewer) forwards the Internet Draft to the IESG for + publication as an informational RFC or rejects it. If the + specification is a standards track document, the usual IETF + procedures for such documents are followed. + + Decisions made by the iSCSI extension item reviewer must be published + within two weeks after the month-long review period. Decisions made + by the iSCSI extension item reviewer can be appealed through the IESG + appeal process. + +13.5.3. IANA Registration + + Provided that the iSCSI extension item has either passed review or + has been successfully appealed to the IESG, and the specification is + published as an RFC, then IANA will register the iSCSI extension item + and make the registration available to the community. + +13.5.4. Standard iSCSI extension item-label format + + The following character symbols are used iSCSI extension item-labels + (the hexadecimal values represent Unicode code points): + + (a-z, A-Z) - letters + (0-9) - digits + "." (0x2e) - dot + "-" (0x2d) - minus + "+" (0x2b) - plus + "@" (0x40) - commercial at + "_" (0x5f) - underscore + + + + +Satran, et al. Standards Track [Page 204] + +RFC 3720 iSCSI April 2004 + + + An iSCSI extension item-label is a string of one or more characters + that consist of letters, digits, dot, minus, plus, commercial at, or + underscore. An iSCSI extension item-label MUST begin with a capital + letter and must not exceed 63 characters. + +13.6. IANA Procedures for Registering iSCSI extension items + + The identity of the iSCSI extension item reviewer is communicated to + the IANA by the IESG. Then, the IANA only acts in response to iSCSI + extension item definitions that are approved by the iSCSI extension + item reviewer and forwarded by the reviewer to the IANA for + registration, or in response to a communication from the IESG that an + iSCSI extension item definition appeal has overturned the iSCSI + extension item reviewer's ruling. + +References + +Normative References + + [CAM] ANSI X3.232-199X, Common Access Method-3. + + [EUI] "Guidelines for 64-bit Global Identifier (EUI-64)", + http: + //standards.ieee.org/regauth/oui/tutorials/EUI64.html + + [OUI] "IEEE OUI and Company_Id Assignments", + http://standards.ieee.org/regauth/oui + + [RFC791] Postel, J., "Internet Protocol", STD 5, RFC 791, + September 1981. + + [RFC793] Postel, J., "Transmission Control Protocol", STD 7, + RFC 793, September 1981. + + [RFC1035] Mockapetris, P., "Domain Names - Implementation and + Specification", STD 13, RFC 1035, November 1987. + + [RFC1122] Braden, R., Ed., "Requirements for Internet Hosts- + Communication Layer", STD 3, RFC 1122, October 1989. + + [RFC1510] Kohl, J. and C. Neuman, "The Kerberos Network + Authentication Service (V5)", RFC 1510, September + 1993. + + [RFC1737] Sollins, K. and L. Masinter "Functional Requirements + for Uniform Resource Names"RFC 1737, December 1994. + + + + + +Satran, et al. Standards Track [Page 205] + +RFC 3720 iSCSI April 2004 + + + [RFC1964] Linn, J., "The Kerberos Version 5 GSS-API Mechanism", + RFC 1964, June 1996. + + [RFC1982] Elz, R. and R. Bush, "Serial Number Arithmetic", RFC + 1982, August 1996. + + [RFC1994] Simpson, W., "PPP Challenge Handshake Authentication + Protocol (CHAP)", RFC 1994, August 1996. + + [RFC2025] Adams, C., "The Simple Public-Key GSS-API Mechanism + (SPKM)", RFC 2025, October 1996. + + [RFC2045] Borenstein, N. and N. Freed, "MIME (Multipurpose + Internet Mail Extensions) Part One: Mechanisms for + Specifying and Describing the Format of Internet + Message Bodies", RFC 2045, November 1996. + + [RFC2119] Bradner, S. "Key Words for use in RFCs to Indicate + Requirement Levels", BCP 14, RFC 2119, March 1997. + + [RFC2279] Yergeau, F., "UTF-8, a Transformation Format of ISO + 10646", RFC 2279 October 1996. + + [RFC2373] Hinden, R. and S. Deering, "IP Version 6 Addressing + Architecture", RFC 2373, July 1998. + + [RFC2396] Berners-Lee, T., Fielding, R. and L. Masinter "Uniform + Resource Identifiers", RFC 2396, August 1998. + + [RFC2401] Kent, S. and R. Atkinson, "Security Architecture for + the Internet Protocol", RFC 2401, November 1998. + + [RFC2404] Madson, C. and R. Glenn, "The Use of HMAC-SHA-1-96 + within ESP and AH", RFC 2404, November 1998. + + [RFC2406] Kent, S. and R. Atkinson, "IP Encapsulating Security + Payload (ESP)", RFC 2406, November 1998. + + [RFC2407] Piper, D., "The Internet IP Security Domain of + Interpretation of ISAKMP", RFC 2407, November 1998. + + [RFC2409] Harkins, D. and D. Carrel, "The Internet Key Exchange + (IKE)", RFC2409, November 1998. + + [RFC2434] Narten, T. and H. Alvestrand, "Guidelines for Writing + an IANA Considerations Section in RFCs.", BCP 26, RFC + 2434, October 1998. + + + + +Satran, et al. Standards Track [Page 206] + +RFC 3720 iSCSI April 2004 + + + [RFC2451] Pereira, R. and R. Adams " The ESP CBC-Mode Cipher + Algorithms", RFC 2451, November 1998. + + [RFC2732] Hinden, R., Carpenter, B. and L. Masinter, "Format for + Literal IPv6 Addresses in URL's", RFC 2451, December + 1999. + + [RFC2945] Wu, T., "The SRP Authentication and Key Exchange + System", RFC 2945, September 2000. + + [RFC3066] Alvestrand, H., "Tags for the Identification of + Languages", STD 47, RFC 3066, January 2001. + + [RFC3454] Hoffman, P. and M. Blanchet, "Preparation of + Internationalized Strings ("stringprep")", RFC 3454, + December 2002. + + [RFC3566] Frankel, S. and H. Herbert, "The AES-XCBC-MAC-96 + Algorithm and Its Use With IPsec", RFC 3566, September + 2003. + + [RFC3686] Housley, R., "Using Advanced Encryption Standard (AES) + Counter Mode with IPsec Encapsulating Security Payload + (ESP)", RFC 3686, January 2004. + + [RFC3722] Bakke, M., "String Profile for Internet Small Computer + Systems Interface (iSCSI) Names", RFC 3722, March + 2004. + + [RFC3723] Aboba, B., Tseng, J., Walker, J., Rangan, V. and F. + Travostino, "Securing Block Storage Protocols over + IP", RFC 3723, March 2004. + + [SAM2] T10/1157D, SCSI Architecture Model - 2 (SAM-2). + + [SBC] NCITS.306-1998, SCSI-3 Block Commands (SBC). + + [SPC3] T10/1416-D, SCSI Primary Commands-3. + + [UNICODE] Unicode Standard Annex #15, "Unicode Normalization + Forms", http://www.unicode.org/unicode/reports/tr15 + + + + + + + + + + +Satran, et al. Standards Track [Page 207] + +RFC 3720 iSCSI April 2004 + + +Informative References + + [BOOT] P. Sarkar, et al., "Bootstrapping Clients using the + iSCSI Protocol", Work in Progress, July 2003. + + [Castagnoli93] G. Castagnoli, S. Braeuer and M. Herrman "Optimization + of Cyclic Redundancy-Check Codes with 24 and 32 Parity + Bits", IEEE Transact. on Communications, Vol. 41, No. + 6, June 1993. + + [CORD] Chadalapaka, M. and R. Elliott, "SCSI Command + Ordering Considerations with iSCSI", Work in Progress. + + [RFC3347] Krueger, M., Haagens, R., Sapuntzakis, C. and M. + Bakke, "Small Computer Systems Interface protocol over + the Internet (iSCSI) Requirements and Design + Considerations", RFC 3347, July 2002. + + [RFC3385] Sheinwald, D., Staran, J., Thaler, P. and V. Cavanna, + "Internet Protocol Small Computer System Interface + (iSCSI) Cyclic Redundancy Check (CRC)/Checksum + Considerations", RFC 3385, September 2002. + + [RFC3721] Bakke M., Hafner, J., Hufferd, J., Voruganti, K. and + M. Krueger, "Internet Small Computer Systems Interface + (iSCSI) Naming and Discovery, RFC 3721, March 2004. + + [SEQ-EXT] Kent, S., "IP Encapsulating Security Payload (ESP)", + Work in Progress, July 2002. + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 208] + +RFC 3720 iSCSI April 2004 + + +Appendix A. Sync and Steering with Fixed Interval Markers + + This appendix presents a simple scheme for synchronization (PDU + boundary retrieval). It uses markers that include synchronization + information placed at fixed intervals in the TCP stream. + + A Marker consists of: + + Byte / 0 | 1 | 2 | 3 | + / | | | | + |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7| + +---------------+---------------+---------------+---------------+ + 0| Next-iSCSI-PDU-start pointer - copy #1 | + +---------------+---------------+---------------+---------------+ + 4| Next-iSCSI-PDU-start pointer - copy #2 | + +---------------+---------------+---------------+---------------+ + + The Marker scheme uses payload byte stream counting that includes + every byte placed by iSCSI in the TCP stream except for the markers + themselves. It also excludes any bytes that TCP counts but are not + originated by iSCSI. + + Markers MUST NOT be included in digest calculation. + + The Marker indicates the offset to the next iSCSI PDU header. The + Marker is eight bytes in length and contains two 32-bit offset fields + that indicate how many bytes to skip in the TCP stream in order to + find the next iSCSI PDU header. The marker uses two copies of the + pointer so that a marker that spans a TCP packet boundary should + leave at least one valid copy in one of the packets. + + The structure and semantics of an inserted marker are independent of + the marker interval. + + The use of markers is negotiable. The initiator and target MAY + indicate their readiness to receive and/or send markers during login + separately for each connection. The default is No. + +A.1. Markers At Fixed Intervals + + A marker is inserted at fixed intervals in the TCP byte stream. + During login, each end of the iSCSI session specifies the interval at + which it is willing to receive the marker, or it disables the marker + altogether. If a receiver indicates that it desires a marker, the + sender MAY agree (during negotiation) and provide the marker at the + desired interval. However, in certain environments, a sender that + does not provide markers to a receiver that wants markers may suffer + an appreciable performance degradation. + + + +Satran, et al. Standards Track [Page 209] + +RFC 3720 iSCSI April 2004 + + + The marker interval and the initial marker-less interval are counted + in terms of the bytes placed in the TCP stream data by iSCSI. + + When reduced to iSCSI terms, markers MUST indicate the offset to a + 4-byte word boundary in the stream. The least significant two bits + of each marker word are reserved and are considered 0 for offset + computation. + + Padding iSCSI PDU payloads to 4-byte word boundaries simplifies + marker manipulation. + +A.2. Initial Marker-less Interval + + To enable the connection setup including the Login Phase negotiation, + marking (if any) is only started at the first marker interval after + the end of the Login Phase. However, in order to enable the marker + inclusion and exclusion mechanism to work without knowledge of the + length of the Login Phase, the first marker will be placed in the TCP + stream as if the Marker-less interval had included markers. + + Thus, all markers appear in the stream at locations conforming to the + formula: [(MI + 8) * n - 8] where MI = Marker Interval, n = integer + number. + + For example, if the marker interval is 512 bytes and the login ended + at byte 1003 (first iSCSI placed byte is 0), the first marker will be + inserted after byte 1031 in the stream. + +A.3. Negotiation + + The following operational key=value pairs are used to negotiate the + fixed interval markers. The direction (output or input) is relative + to the initiator. + +A.3.1. OFMarker, IFMarker + + Use: IO + Senders: Initiator and Target + Scope: CO + + OFMarker=<boolean-value> + IFMarker=<boolean-value> + + Default is No. + + Result function is AND. + + + + + +Satran, et al. Standards Track [Page 210] + +RFC 3720 iSCSI April 2004 + + + OFMarker is used to turn on or off the initiator to target markers + on the connection. IFMarker is used to turn on or off the target to + initiator markers on the connection. + + Examples: + + I->OFMarker=Yes,IFMarker=Yes + T->OFMarker=Yes,IFMarker=Yes + + Results in the Marker being used in both directions while: + + I->OFMarker=Yes,IFMarker=Yes + T->OFMarker=Yes,IFMarker=No + + Results in Marker being used from the initiator to the target, but + not from the target to initiator. + +A.3.2. OFMarkInt, IFMarkInt + + Use: IO + Senders: Initiator and Target + Scope: CO + OFMarkInt is Irrelevant when: OFMarker=No + IFMarkInt is Irrelevant when: IFMarker=No + + Offering: + + OFMarkInt=<numeric-range-from-1-to-65535> + IFMarkInt=<numeric-range-from-1-to-65535> + + Responding: + + OFMarkInt=<numeric-value-from-1-to-65535>|Reject + IFMarkInt=<numeric-value-from-1-to-65535>|Reject + + OFMarkInt is used to set the interval for the initiator to target + markers on the connection. IFMarkInt is used to set the interval for + the target to initiator markers on the connection. + + For the offering, the initiator or target indicates the minimum to + maximum interval (in 4-byte words) it wants the markers for one or + both directions. In case it only wants a specific value, only a + single value has to be specified. The responder selects a value + within the minimum and maximum offered or the only value offered or + indicates through the xFMarker key=value its inability to set and/or + receive markers. When the interval is unacceptable the responder + answers with "Reject". Reject is resetting the marker function in + the specified direction (Output or Input) to No. + + + +Satran, et al. Standards Track [Page 211] + +RFC 3720 iSCSI April 2004 + + + The interval is measured from the end of a marker to the beginning of + the next marker. For example, a value of 1024 means 1024 words (4096 + bytes of iSCSI payload between markers). + + The default is 2048. + +Appendix B. Examples + +B.1. Read Operation Example + + +------------------+-----------------------+----------------------+ + |Initiator Function| PDU Type | Target Function | + +------------------+-----------------------+----------------------+ + | Command request |SCSI Command (READ)>>> | | + | (read) | | | + +------------------+-----------------------+----------------------+ + | | |Prepare Data Transfer | + +------------------+-----------------------+----------------------+ + | Receive Data | <<< SCSI Data-In | Send Data | + +------------------+-----------------------+----------------------+ + | Receive Data | <<< SCSI Data-In | Send Data | + +------------------+-----------------------+----------------------+ + | Receive Data | <<< SCSI Data-In | Send Data | + +------------------+-----------------------+----------------------+ + | | <<< SCSI Response |Send Status and Sense | + +------------------+-----------------------+----------------------+ + | Command Complete | | | + +------------------+-----------------------+----------------------+ + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 212] + +RFC 3720 iSCSI April 2004 + + +B.2. Write Operation Example + + +------------------+-----------------------+---------------------+ + |Initiator Function| PDU Type | Target Function | + +------------------+-----------------------+---------------------+ + | Command request |SCSI Command (WRITE)>>>| Receive command | + | (write) | | and queue it | + +------------------+-----------------------+---------------------+ + | | | Process old commands| + +------------------+-----------------------+---------------------+ + | | | Ready to process | + | | <<< R2T | WRITE command | + +------------------+-----------------------+---------------------+ + | Send Data | SCSI Data-Out >>> | Receive Data | + +------------------+-----------------------+---------------------+ + | | <<< R2T | Ready for data | + +------------------+-----------------------+---------------------+ + | | <<< R2T | Ready for data | + +------------------+-----------------------+---------------------+ + | Send Data | SCSI Data-Out >>> | Receive Data | + +------------------+-----------------------+---------------------+ + | Send Data | SCSI Data-Out >>> | Receive Data | + +------------------+-----------------------+---------------------+ + | | <<< SCSI Response |Send Status and Sense| + +------------------+-----------------------+---------------------+ + | Command Complete | | | + +------------------+-----------------------+---------------------+ + + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 213] + +RFC 3720 iSCSI April 2004 + + +B.3. R2TSN/DataSN Use Examples + + Output (write) data DataSN/R2TSN Example + + +------------------+-----------------------+----------------------+ + |Initiator Function| PDU Type & Content | Target Function | + +------------------+-----------------------+----------------------+ + | Command request |SCSI Command (WRITE)>>>| Receive command | + | (write) | | and queue it | + +------------------+-----------------------+----------------------+ + | | | Process old commands | + +------------------+-----------------------+----------------------+ + | | <<< R2T | Ready for data | + | | R2TSN = 0 | | + +------------------+-----------------------+----------------------+ + | | <<< R2T | Ready for more data | + | | R2TSN = 1 | | + +------------------+-----------------------+----------------------+ + | Send Data | SCSI Data-Out >>> | Receive Data | + | for R2TSN 0 | DataSN = 0, F=0 | | + +------------------+-----------------------+----------------------+ + | Send Data | SCSI Data-Out >>> | Receive Data | + | for R2TSN 0 | DataSN = 1, F=1 | | + +------------------+-----------------------+----------------------+ + | Send Data | SCSI Data >>> | Receive Data | + | for R2TSN 1 | DataSN = 0, F=1 | | + +------------------+-----------------------+----------------------+ + | | <<< SCSI Response |Send Status and Sense | + | | ExpDataSN = 0 | | + +------------------+-----------------------+----------------------+ + | Command Complete | | | + +------------------+-----------------------+----------------------+ + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 214] + +RFC 3720 iSCSI April 2004 + + + Input (read) data DataSN Example + + +------------------+-----------------------+----------------------+ + |Initiator Function| PDU Type | Target Function | + +------------------+-----------------------+----------------------+ + | Command request |SCSI Command (READ)>>> | | + | (read) | | | + +------------------+-----------------------+----------------------+ + | | | Prepare Data Transfer| + +------------------+-----------------------+----------------------+ + | Receive Data | <<< SCSI Data-In | Send Data | + | | DataSN = 0, F=0 | | + +------------------+-----------------------+----------------------+ + | Receive Data | <<< SCSI Data-In | Send Data | + | | DataSN = 1, F=0 | | + +------------------+-----------------------+----------------------+ + | Receive Data | <<< SCSI Data-In | Send Data | + | | DataSN = 2, F=1 | | + +------------------+-----------------------+----------------------+ + | | <<< SCSI Response |Send Status and Sense | + | | ExpDataSN = 3 | | + +------------------+-----------------------+----------------------+ + | Command Complete | | | + +------------------+-----------------------+----------------------+ + + + + + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 215] + +RFC 3720 iSCSI April 2004 + + + Bidirectional DataSN Example + + +------------------+-----------------------+----------------------+ + |Initiator Function| PDU Type | Target Function | + +------------------+-----------------------+----------------------+ + | Command request |SCSI Command >>> | | + | (Read-Write) | Read-Write | | + +------------------+-----------------------+----------------------+ + | | | Process old commands | + +------------------+-----------------------+----------------------+ + | | <<< R2T | Ready to process | + | | R2TSN = 0 | WRITE command | + +------------------+-----------------------+----------------------+ + | * Receive Data | <<< SCSI Data-In | Send Data | + | | DataSN = 1, F=0 | | + +------------------+-----------------------+----------------------+ + | * Receive Data | <<< SCSI Data-In | Send Data | + | | DataSN = 2, F=1 | | + +------------------+-----------------------+----------------------+ + | * Send Data | SCSI Data-Out >>> | Receive Data | + | for R2TSN 0 | DataSN = 0, F=1 | | + +------------------+-----------------------+----------------------+ + | | <<< SCSI Response |Send Status and Sense | + | | ExpDataSN = 3 | | + +------------------+-----------------------+----------------------+ + | Command Complete | | | + +------------------+-----------------------+----------------------+ + + *) Send data and Receive Data may be transferred simultaneously as in + an atomic Read-Old-Write-New or sequentially as in an atomic + Read-Update-Write (in the latter case the R2T may follow the received + data). + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 216] + +RFC 3720 iSCSI April 2004 + + + Unsolicited and immediate output (write) data with DataSN Example + + +------------------+-----------------------+----------------------+ + |Initiator Function| PDU Type & Content | Target Function | + +------------------+-----------------------+----------------------+ + | Command request |SCSI Command (WRITE)>>>| Receive command | + | (write) |F=0 | and data | + |+ Immediate data | | and queue it | + +------------------+-----------------------+----------------------+ + | Send Unsolicited | SCSI Write Data >>> | Receive more Data | + | Data | DataSN = 0, F=1 | | + +------------------+-----------------------+----------------------+ + | | | Process old commands | + +------------------+-----------------------+----------------------+ + | | <<< R2T | Ready for more data | + | | R2TSN = 0 | | + +------------------+-----------------------+----------------------+ + | Send Data | SCSI Write Data >>> | Receive Data | + | for R2TSN 0 | DataSN = 0, F=1 | | + +------------------+-----------------------+----------------------+ + | | <<< SCSI Response |Send Status and Sense | + | | | | + +------------------+-----------------------+----------------------+ + | Command Complete | | | + +------------------+-----------------------+----------------------+ + +B.4. CRC Examples + + N.B. all Values are Hexadecimal + + 32 bytes of zeroes: + + Byte: 0 1 2 3 + + 0: 00 00 00 00 + ... + 28: 00 00 00 00 + + CRC: aa 36 91 8a + + 32 bytes of ones: + + Byte: 0 1 2 3 + + 0: ff ff ff ff + ... + 28: ff ff ff ff + + + + +Satran, et al. Standards Track [Page 217] + +RFC 3720 iSCSI April 2004 + + + CRC: 43 ab a8 62 + + 32 bytes of incrementing 00..1f: + + Byte: 0 1 2 3 + + 0: 00 01 02 03 + ... + 28: 1c 1d 1e 1f + + CRC: 4e 79 dd 46 + + 32 bytes of decrementing 1f..00: + + Byte: 0 1 2 3 + + 0: 1f 1e 1d 1c + ... + 28: 03 02 01 00 + + CRC: 5c db 3f 11 + + An iSCSI - SCSI Read (10) Command PDU + + Byte: 0 1 2 3 + + 0: 01 c0 00 00 + 4: 00 00 00 00 + 8: 00 00 00 00 + 12: 00 00 00 00 + 16: 14 00 00 00 + 20: 00 00 04 00 + 24: 00 00 00 14 + 28: 00 00 00 18 + 32: 28 00 00 00 + 36: 00 00 00 00 + 40: 02 00 00 00 + 44: 00 00 00 00 + + CRC: 56 3a 96 d9 + + + + + + + + + + + +Satran, et al. Standards Track [Page 218] + +RFC 3720 iSCSI April 2004 + + +Appendix C. Login Phase Examples + + In the first example, the initiator and target authenticate each + other via Kerberos: + + I-> Login (CSG,NSG=0,1 T=1) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + AuthMethod=KRB5,SRP,None + + T-> Login (CSG,NSG=0,0 T=0) + AuthMethod=KRB5 + + I-> Login (CSG,NSG=0,1 T=1) + KRB_AP_REQ=<krb_ap_req> + + (krb_ap_req contains the Kerberos V5 ticket and authenticator + with MUTUAL-REQUIRED set in the ap-options field) + + If the authentication is successful, the target proceeds with: + + T-> Login (CSG,NSG=0,1 T=1) + KRB_AP_REP=<krb_ap_rep> + + (krb_ap_rep is the Kerberos V5 mutual authentication reply) + + If the authentication is successful, the initiator may proceed + with: + + I-> Login (CSG,NSG=1,0 T=0) FirstBurstLength=8192 + T-> Login (CSG,NSG=1,0 T=0) FirstBurstLength=4096 + MaxBurstLength=8192 + I-> Login (CSG,NSG=1,0 T=0) MaxBurstLength=8192 + ... more iSCSI Operational Parameters + + T-> Login (CSG,NSG=1,0 T=0) + ... more iSCSI Operational Parameters + + And at the end: + + I-> Login (CSG,NSG=1,3 T=1) + optional iSCSI parameters + + T-> Login (CSG,NSG=1,3 T=1) "login accept" + + + + + + + +Satran, et al. Standards Track [Page 219] + +RFC 3720 iSCSI April 2004 + + + If the initiator's authentication by the target is not + successful, the target responds with: + + T-> Login "login reject" + + instead of the Login KRB_AP_REP message, and terminates the + connection. + + If the target's authentication by the initiator is not + successful, the initiator terminates the connection (without + responding to the Login KRB_AP_REP message). + + In the next example only the initiator is authenticated by the + target via Kerberos: + + I-> Login (CSG,NSG=0,1 T=1) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + AuthMethod=SRP,KRB5,None + + T-> Login-PR (CSG,NSG=0,0 T=0) + AuthMethod=KRB5 + + I-> Login (CSG,NSG=0,1 T=1) + KRB_AP_REQ=krb_ap_req + + (MUTUAL-REQUIRED not set in the ap-options field of krb_ap_req) + + If the authentication is successful, the target proceeds with: + + T-> Login (CSG,NSG=0,1 T=1) + + I-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + T-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + . . . + + T-> Login (CSG,NSG=1,3 T=1)"login accept" + + + + + + + + + + +Satran, et al. Standards Track [Page 220] + +RFC 3720 iSCSI April 2004 + + + In the next example, the initiator and target authenticate each + other via SPKM1: + + I-> Login (CSG,NSG=0,1 T=1) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + AuthMethod=SPKM1,KRB5,None + + T-> Login (CSG,NSG=0,0 T=0) + AuthMethod=SPKM1 + + I-> Login (CSG,NSG=0,0 T=0) + SPKM_REQ=<spkm-req> + + (spkm-req is the SPKM-REQ token with the mutual-state bit in the + options field of the REQ-TOKEN set) + + T-> Login (CSG,NSG=0,0 T=0) + SPKM_REP_TI=<spkm-rep-ti> + + If the authentication is successful, the initiator proceeds: + + I-> Login (CSG,NSG=0,1 T=1) + SPKM_REP_IT=<spkm-rep-it> + + If the authentication is successful, the target proceeds with: + + T-> Login (CSG,NSG=0,1 T=1) + + The initiator may proceed: + + I-> Login (CSG,NSG=1,0 T=0) ... iSCSI parameters + T-> Login (CSG,NSG=1,0 T=0) ... iSCSI parameters + + And at the end: + + I-> Login (CSG,NSG=1,3 T=1) + optional iSCSI parameters + + T-> Login (CSG,NSG=1,3 T=1) "login accept" + + + If the target's authentication by the initiator is not + successful, the initiator terminates the connection (without + responding to the Login SPKM_REP_TI message). + + + + + + +Satran, et al. Standards Track [Page 221] + +RFC 3720 iSCSI April 2004 + + + If the initiator's authentication by the target is not + successful, the target responds with: + + T-> Login "login reject" + + instead of the Login "proceed and change stage" message, and + terminates the connection. + + + In the next example, the initiator and target authenticate each + other via SPKM2: + + I-> Login (CSG,NSG=0,0 T=0) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + AuthMethod=SPKM1,SPKM2 + + T-> Login-PR (CSG,NSG=0,0 T=0) + AuthMethod=SPKM2 + + I-> Login (CSG,NSG=0,1 T=1) + SPKM_REQ=<spkm-req> + + (spkm-req is the SPKM-REQ token with the mutual-state bit in the + options field of the REQ-TOKEN not set) + + If the authentication is successful, the target proceeds with: + + T-> Login (CSG,NSG=0,1 T=1) + + The initiator may proceed: + + I-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + T-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + And at the end: + + I-> Login (CSG,NSG=1,3 T=1) + optional iSCSI parameters + + T-> Login (CSG,NSG=1,3 T=1) "login accept" + + + + + + + +Satran, et al. Standards Track [Page 222] + +RFC 3720 iSCSI April 2004 + + + In the next example, the initiator and target authenticate each + other via SRP: + + I-> Login (CSG,NSG=0,1 T=1) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + AuthMethod=KRB5,SRP,None + + T-> Login-PR (CSG,NSG=0,0 T=0) + AuthMethod=SRP + + I-> Login (CSG,NSG=0,0 T=0) + SRP_U=<user> + TargetAuth=Yes + + T-> Login (CSG,NSG=0,0 T=0) + SRP_GROUP=SRP-1536,SRP-1024 + SRP_s=<s> + + I-> Login (CSG,NSG=0,0 T=0) + SRP_GROUP=SRP-1536 + SRP_A=<A> + + T-> Login (CSG,NSG=0,0 T=0) + SRP_B=<B> + + I-> Login (CSG,NSG=0,1 T=1) + SRP_M=<M> + + If the initiator authentication is successful, the target + proceeds: + + T-> Login (CSG,NSG=0,1 T=1) + SRP_HM=<H(A | M | K)> + + Where N, g, s, A, B, M, and H(A | M | K) are defined in [RFC2945]. + + If the target authentication is not successful, the initiator + terminates the connection; otherwise, it proceeds. + + I-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + T-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + + + + + +Satran, et al. Standards Track [Page 223] + +RFC 3720 iSCSI April 2004 + + + And at the end: + + I-> Login (CSG,NSG=1,3 T=1) + optional iSCSI parameters + + T-> Login (CSG,NSG=1,3 T=1) "login accept" + + If the initiator authentication is not successful, the target + responds with: + + T-> Login "login reject" + + Instead of the T-> Login SRP_HM=<H(A | M | K)> message and + terminates the connection. + + In the next example, the initiator and target authenticate each + other via SRP: + + I-> Login (CSG,NSG=0,1 T=1) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + AuthMethod=KRB5,SRP,None + + T-> Login-PR (CSG,NSG=0,0 T=0) + AuthMethod=SRP + + I-> Login (CSG,NSG=0,0 T=0) + SRP_U=<user> + TargetAuth=No + + T-> Login (CSG,NSG=0,0 T=0) + SRP_GROUP=SRP-1536 + SRP_s=<s> + + I-> Login (CSG,NSG=0,0 T=0) + SRP_GROUP=SRP-1536 + SRP_A=<A> + + T-> Login (CSG,NSG=0,0 T=0) + SRP_B=<B> + + I-> Login (CSG,NSG=0,1 T=1) + SRP_M=<M> + + If the initiator authentication is successful, the target + proceeds: + + T-> Login (CSG,NSG=0,1 T=1) + + + +Satran, et al. Standards Track [Page 224] + +RFC 3720 iSCSI April 2004 + + + + I-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + T-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + And at the end: + + I-> Login (CSG,NSG=1,3 T=1) + optional iSCSI parameters + + T-> Login (CSG,NSG=1,3 T=1) "login accept" + + In the next example the initiator and target authenticate each other + via CHAP: + + I-> Login (CSG,NSG=0,0 T=0) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + AuthMethod=KRB5,CHAP,None + + T-> Login-PR (CSG,NSG=0,0 T=0) + AuthMethod=CHAP + + I-> Login (CSG,NSG=0,0 T=0) + CHAP_A=<A1,A2> + + T-> Login (CSG,NSG=0,0 T=0) + CHAP_A=<A1> + CHAP_I=<I> + CHAP_C=<C> + + I-> Login (CSG,NSG=0,1 T=1) + CHAP_N=<N> + CHAP_R=<R> + CHAP_I=<I> + CHAP_C=<C> + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 225] + +RFC 3720 iSCSI April 2004 + + + If the initiator authentication is successful, the target + proceeds: + + T-> Login (CSG,NSG=0,1 T=1) + CHAP_N=<N> + CHAP_R=<R> + + If the target authentication is not successful, the initiator + aborts the connection; otherwise, it proceeds. + + I-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + T-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + And at the end: + + I-> Login (CSG,NSG=1,3 T=1) + optional iSCSI parameters + + T-> Login (CSG,NSG=1,3 T=1) "login accept" + + If the initiator authentication is not successful, the target + responds with: + + T-> Login "login reject" + + Instead of the Login CHAP_R=<response> "proceed and change + stage" message and terminates the connection. + + In the next example, only the initiator is authenticated by the + target via CHAP: + + I-> Login (CSG,NSG=0,1 T=0) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + AuthMethod=KRB5,CHAP,None + + T-> Login-PR (CSG,NSG=0,0 T=0) + AuthMethod=CHAP + + I-> Login (CSG,NSG=0,0 T=0) + CHAP_A=<A1,A2> + + + + + + + + +Satran, et al. Standards Track [Page 226] + +RFC 3720 iSCSI April 2004 + + + T-> Login (CSG,NSG=0,0 T=0) + CHAP_A=<A1> + CHAP_I=<I> + CHAP_C=<C> + + I-> Login (CSG,NSG=0,1 T=1) + CHAP_N=<N> + CHAP_R=<R> + + If the initiator authentication is successful, the target + proceeds: + + T-> Login (CSG,NSG=0,1 T=1) + + I-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + T-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + And at the end: + + I-> Login (CSG,NSG=1,3 T=1) + optional iSCSI parameters + + T-> Login (CSG,NSG=1,3 T=1) "login accept" + + In the next example, the initiator does not offer any security + parameters. It therefore may offer iSCSI parameters on the Login PDU + with the T bit set to 1, and the target may respond with a final + Login Response PDU immediately: + + I-> Login (CSG,NSG=1,3 T=1) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + ... iSCSI parameters + + T-> Login (CSG,NSG=1,3 T=1) "login accept" + ... ISCSI parameters + + In the next example, the initiator does offer security + parameters on the Login PDU, but the target does not choose + any (i.e., chooses the "None" values): + + I-> Login (CSG,NSG=0,1 T=1) + InitiatorName=iqn.1999-07.com.os:hostid.77 + TargetName=iqn.1999-07.com.example:diskarray.sn.88 + AuthMethod=KRB5,SRP,None + + + +Satran, et al. Standards Track [Page 227] + +RFC 3720 iSCSI April 2004 + + + + T-> Login-PR (CSG,NSG=0,1 T=1) + AuthMethod=None + + I-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + T-> Login (CSG,NSG=1,0 T=0) + ... iSCSI parameters + + And at the end: + + I-> Login (CSG,NSG=1,3 T=1) + optional iSCSI parameters + + T-> Login (CSG,NSG=1,3 T=1) "login accept" + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 228] + +RFC 3720 iSCSI April 2004 + + +Appendix D. SendTargets Operation + + To reduce the amount of configuration required on an initiator, iSCSI + provides the SendTargets text request. The initiator uses the + SendTargets request to get a list of targets to which it may have + access, as well as the list of addresses (IP address and TCP port) on + which these targets may be accessed. + + To make use of SendTargets, an initiator must first establish one of + two types of sessions. If the initiator establishes the session + using the key "SessionType=Discovery", the session is a discovery + session, and a target name does not need to be specified. Otherwise, + the session is a normal, operational session. The SendTargets + command MUST only be sent during the Full Feature Phase of a normal + or discovery session. + + A system that contains targets MUST support discovery sessions on + each of its iSCSI IP address-port pairs, and MUST support the + SendTargets command on the discovery session. In a discovery + session, a target MUST return all path information (target name and + IP address-port pairs and portal group tags) for the targets on the + target network entity which the requesting initiator is authorized to + access. + + A target MUST support the SendTargets command on operational + sessions; these will only return path information about the target to + which the session is connected, and do not need to return information + about other target names that may be defined in the responding + system. + + An initiator MAY make use of the SendTargets as it sees fit. + + A SendTargets command consists of a single Text request PDU. This + PDU contains exactly one text key and value. The text key MUST be + SendTargets. The expected response depends upon the value, as well + as whether the session is a discovery or operational session. + + The value must be one of: + + All + + The initiator is requesting that information on all relevant + targets known to the implementation be returned. This value + MUST be supported on a discovery session, and MUST NOT be + supported on an operational session. + + + + + + +Satran, et al. Standards Track [Page 229] + +RFC 3720 iSCSI April 2004 + + + <iSCSI-target-name> + + If an iSCSI target name is specified, the session should respond + with addresses for only the named target, if possible. This + value MUST be supported on discovery sessions. A discovery + session MUST be capable of returning addresses for those + targets that would have been returned had value=All had been + designated. + + <nothing> + + The session should only respond with addresses for the target to + which the session is logged in. This MUST be supported on + operational sessions, and MUST NOT return targets other than + the one to which the session is logged in. + + The response to this command is a text response that contains a list + of zero or more targets and, optionally, their addresses. Each + target is returned as a target record. A target record begins with + the TargetName text key, followed by a list of TargetAddress text + keys, and bounded by the end of the text response or the next + TargetName key, which begins a new record. No text keys other than + TargetName and TargetAddress are permitted within a SendTargets + response. + + For the format of the TargetName, see Section 12.4 TargetName. + + In a discovery session, a target MAY respond to a SendTargets request + with its complete list of targets, or with a list of targets that is + based on the name of the initiator logged in to the session. + + A SendTargets response MUST NOT contain target names if there are no + targets for the requesting initiator to access. + + Each target record returned includes zero or more TargetAddress + fields. + + Each target record starts with one text key of the form: + + TargetName=<target-name-goes-here> + + Followed by zero or more address keys of the form: + + TargetAddress=<hostname-or-ipaddress>[:<tcp-port>], + <portal-group-tag> + + The hostname-or-ipaddress contains a domain name, IPv4 address, or + IPv6 address, as specified for the TargetAddress key. + + + +Satran, et al. Standards Track [Page 230] + +RFC 3720 iSCSI April 2004 + + + A hostname-or-ipaddress duplicated in TargetAddress responses for a + given node (the port is absent or equal) would probably indicate that + multiple address families are in use at once (IPV6 and IPV4). + + Each TargetAddress belongs to a portal group, identified by its + numeric portal group tag (as in Section 12.9 TargetPortalGroupTag). + The iSCSI target name, together with this tag, constitutes the SCSI + port identifier; the tag only needs to be unique within a given + target's name list of addresses. + + Multiple-connection sessions can span iSCSI addresses that belong to + the same portal group. + + Multiple-connection sessions cannot span iSCSI addresses that belong + to different portal groups. + + If a SendTargets response reports an iSCSI address for a target, it + SHOULD also report all other addresses in its portal group in the + same response. + + A SendTargets text response can be longer than a single Text Response + PDU, and makes use of the long text responses as specified. + + After obtaining a list of targets from the discovery target session, + an iSCSI initiator may initiate new sessions to log in to the + discovered targets for full operation. The initiator MAY keep the + discovery session open, and MAY send subsequent SendTargets commands + to discover new targets. + + Examples: + + This example is the SendTargets response from a single target that + has no other interface ports. + + Initiator sends text request that contains: + + SendTargets=All + + Target sends a text response that contains: + + TargetName=iqn.1993-11.com.example:diskarray.sn.8675309 + + All the target had to return in the simple case was the target name. + It is assumed by the initiator that the IP address and TCP port for + this target are the same as used on the current connection to the + default iSCSI target. + + + + + +Satran, et al. Standards Track [Page 231] + +RFC 3720 iSCSI April 2004 + + + The next example has two internal iSCSI targets, each accessible via + two different ports with different IP addresses. The following is + the text response: + + TargetName=iqn.1993-11.com.example:diskarray.sn.8675309 + TargetAddress=10.1.0.45:3000,1 TargetAddress=10.1.1.45:3000,2 + TargetName=iqn.1993-11.com.example:diskarray.sn.1234567 + TargetAddress=10.1.0.45:3000,1 TargetAddress=10.1.1.45:3000,2 + + Both targets share both addresses; the multiple addresses are likely + used to provide multi-path support. The initiator may connect to + either target name on either address. Each of the addresses has its + own portal group tag; they do not support spanning + multiple-connection sessions with each other. Keep in mind that the + portal group tags for the two named targets are independent of one + another; portal group "1" on the first target is not necessarily the + same as portal group "1" on the second target. + + In the above example, a DNS host name or an IPv6 address could have + been returned instead of an IPv4 address. + + The next text response shows a target that supports spanning sessions + across multiple addresses, and further illustrates the use of the + portal group tags: + + TargetName=iqn.1993-11.com.example:diskarray.sn.8675309 + + TargetAddress=10.1.0.45:3000,1 TargetAddress=10.1.1.46:3000,1 + TargetAddress=10.1.0.47:3000,2 TargetAddress=10.1.1.48:3000,2 + TargetAddress=10.1.1.49:3000,3 + + In this example, any of the target addresses can be used to reach the + same target. A single-connection session can be established to any + of these TCP addresses. A multiple-connection session could span + addresses .45 and .46 or .47 and .48, but cannot span any other + combination. A TargetAddress with its own tag (.49) cannot be + combined with any other address within the same session. + + This SendTargets response does not indicate whether .49 supports + multiple connections per session; it is communicated via the + MaxConnections text key upon login to the target. + + + + + + + + + + +Satran, et al. Standards Track [Page 232] + +RFC 3720 iSCSI April 2004 + + +Appendix E. Algorithmic Presentation of Error Recovery Classes + + This appendix illustrates the error recovery classes using a + pseudo-programming-language. The procedure names are chosen to be + obvious to most implementers. Each of the recovery classes described + has initiator procedures as well as target procedures. These + algorithms focus on outlining the mechanics of error recovery + classes, and do not exhaustively describe all other aspects/cases. + Examples of this approach are: + + + - Handling for only certain Opcode types is shown. + + - Only certain reason codes (e.g., Recovery in Logout command) + are outlined. + + - Resultant cases, such as recovery of Synchronization on a + header digest error are considered out-of-scope in these + algorithms. In this particular example, a header digest error + may lead to connection recovery if some type of sync and + steering layer is not implemented. + + These algorithms strive to convey the iSCSI error recovery concepts + in the simplest terms, and are not designed to be optimal. + +E.1. General Data Structure and Procedure Description + + This section defines the procedures and data structures that are + commonly used by all the error recovery algorithms. The structures + may not be the exhaustive representations of what is required for a + typical implementation. + + Data structure definitions - + struct TransferContext { + int TargetTransferTag; + int ExpectedDataSN; + }; + + struct TCB { /* task control block */ + Boolean SoFarInOrder; + int ExpectedDataSN; /* used for both R2Ts, and Data */ + int MissingDataSNList[MaxMissingDPDU]; + Boolean FbitReceived; + Boolean StatusXferd; + Boolean CurrentlyAllegiant; + int ActiveR2Ts; + int Response; + char *Reason; + + + +Satran, et al. Standards Track [Page 233] + +RFC 3720 iSCSI April 2004 + + + struct TransferContext + TransferContextList[MaxOutStandingR2T]; + int InitiatorTaskTag; + int CmdSN; + + int SNACK_Tag; + + }; + + struct Connection { + struct Session SessionReference; + Boolean SoFarInOrder; + int CID; + int State; + + int CurrentTimeout; + int ExpectedStatSN; + int MissingStatSNList[MaxMissingSPDU]; + Boolean PerformConnectionCleanup; + }; + + struct Session { + int NumConnections; + int CmdSN; + int Maxconnections; + int ErrorRecoveryLevel; + struct iSCSIEndpoint OtherEndInfo; + struct Connection ConnectionList[MaxSupportedConns]; + }; + + Procedure descriptions - + Receive-a-In-PDU(transport connection, inbound PDU); + check-basic-validity(inbound PDU); + Start-Timer(timeout handler, argument, timeout value); + Build-And-Send-Reject(transport connection, bad PDU, reason code); + +E.2. Within-command Error Recovery Algorithms + +E.2.1. Procedure Descriptions + + Recover-Data-if-Possible(last required DataSN, task control + block); + Build-And-Send-DSnack(task control block); + Build-And-Send-RDSnack(task control block); + Build-And-Send-Abort(task control block); + SCSI-Task-Completion(task control block); + Build-And-Send-A-Data-Burst(transport connection, data-descriptor, + task control block); + + + +Satran, et al. Standards Track [Page 234] + +RFC 3720 iSCSI April 2004 + + + Build-And-Send-R2T(transport connection, data-descriptor, + task control block); + Build-And-Send-Status(transport connection, task control block); + Transfer-Context-Timeout-Handler(transfer context); + + + Notes: + + - One procedure used in this section: Handle-Status-SNACK- + request is defined in Within-connection recovery algorithms. + + - The Response processing pseudo-code, shown in the target + algorithms, applies to all solicited PDUs that carry StatSN - + SCSI Response, Text Response etc. + +E.2.2. Initiator Algorithms + +Recover-Data-if-Possible(LastRequiredDataSN, TCB) +{ + if (operational ErrorRecoveryLevel > 0) { + if (# of missing PDUs is trackable) { + Note the missing DataSNs in TCB. + if (the task spanned a change in + MaxRecvDataSegmentLength) { + if (TCB.StatusXferd is TRUE) + drop the status PDU; + Build-And-Send-RDSnack(TCB); + } else { + Build-And-Send-DSnack(TCB); + } + } else { + TCB.Reason = "Protocol service CRC error"; + } + } else { + TCB.Reason = "Protocol service CRC error"; + } + if (TCB.Reason == "Protocol service CRC error") { + Clear the missing PDU list in the TCB. + if (TCB.StatusXferd is not TRUE) + Build-And-Send-Abort(TCB); + } +} + +Receive-a-In-PDU(Connection, CurrentPDU) +{ + check-basic-validity(CurrentPDU); + if (Header-Digest-Bad) discard, return; + Retrieve TCB for CurrentPDU.InitiatorTaskTag. + + + +Satran, et al. Standards Track [Page 235] + +RFC 3720 iSCSI April 2004 + + + if ((CurrentPDU.type == Data) + or (CurrentPDU.type = R2T)) { + if (Data-Digest-Bad for Data) { + send-data-SNACK = TRUE; + LastRequiredDataSN = CurrentPDU.DataSN; + } else { + if (TCB.SoFarInOrder = TRUE) { + if (current DataSN is expected) { + Increment TCB.ExpectedDataSN. + } else { + + TCB.SoFarInOrder = FALSE; + send-data-SNACK = TRUE; + } + } else { + if (current DataSN was considered missing) { + remove current DataSN from missing PDU list. + } else if (current DataSN is higher than expected) +{ + send-data-SNACK = TRUE; + } else { + discard, return; + } + Adjust TCB.ExpectedDataSN if appropriate. + } + LastRequiredDataSN = CurrentPDU.DataSN - 1; + } + if (send-data-SNACK is TRUE and + task is not already considered failed) { + Recover-Data-if-Possible(LastRequiredDataSN, TCB); + } + if (missing data PDU list is empty) { + TCB.SoFarInOrder = TRUE; + } + if (CurrentPDU.type == R2T) { + Increment ActiveR2Ts for this task. + + Create a data-descriptor for the data burst. + Build-And-Send-A-Data-Burst(Connection, data-descriptor, + + TCB); + } + } else if (CurrentPDU.type == Response) { + if (Data-Digest-Bad) { + send-status-SNACK = TRUE; + } else { + TCB.StatusXferd = TRUE; + Store the status information in TCB. + + + +Satran, et al. Standards Track [Page 236] + +RFC 3720 iSCSI April 2004 + + + if (ExpDataSN does not match) { + TCB.SoFarInOrder = FALSE; + Recover-Data-if-Possible(current DataSN, TCB); + } + if (missing data PDU list is empty) { + TCB.SoFarInOrder = TRUE; + } + } + } else { /* REST UNRELATED TO WITHIN-COMMAND-RECOVERY, NOT + SHOWN */ + } + if ((TCB.SoFarInOrder == TRUE) and + (TCB.StatusXferd == TRUE)) { + SCSI-Task-Completion(TCB); + } +} + +E.2.3. Target Algorithms + +Receive-a-In-PDU(Connection, CurrentPDU) +{ + check-basic-validity(CurrentPDU); + if (Header-Digest-Bad) discard, return; + Retrieve TCB for CurrentPDU.InitiatorTaskTag. + if (CurrentPDU.type == Data) { + Retrieve TContext from CurrentPDU.TargetTransferTag; + if (Data-Digest-Bad) { + Build-And-Send-Reject(Connection, CurrentPDU, + Payload-Digest-Error); + Note the missing data PDUs in MissingDataRange[]. + send-recovery-R2T = TRUE; + } else { + if (current DataSN is not expected) { + Note the missing data PDUs in MissingDataRange[]. + send-recovery-R2T = TRUE; + } + if (CurrentPDU.Fbit == TRUE) { + if (current PDU is solicited) { + Decrement TCB.ActiveR2Ts. + } + if ((current PDU is unsolicited and + data received is less than I/O length and + data received is less than FirstBurstLength) + or (current PDU is solicited and the length of + this burst is less than expected)) { + send-recovery-R2T = TRUE; + Note the missing data in MissingDataRange[]. + } + + + +Satran, et al. Standards Track [Page 237] + +RFC 3720 iSCSI April 2004 + + + } + } + Increment TContext.ExpectedDataSN. + if (send-recovery-R2T is TRUE and + task is not already considered failed) { + if (operational ErrorRecoveryLevel > 0) { + Increment TCB.ActiveR2Ts. + Create a data-descriptor for the data burst + from MissingDataRange. + Build-And-Send-R2T(Connection, data-descriptor, TCB); + } else { + if (current PDU is the last unsolicited) + TCB.Reason = "Not enough unsolicited data"; + else + TCB.Reason = "Protocol service CRC error"; + } + } + if (TCB.ActiveR2Ts == 0) { + Build-And-Send-Status(Connection, TCB); + } + } else if (CurrentPDU.type == SNACK) { + snack-failure = FALSE; + if (operational ErrorRecoveryLevel > 0) { + if (CurrentPDU.type == Data/R2T) { + if (the request is satisfiable) { + + if (request for Data) { + Create a data-descriptor for the data burst + from BegRun and RunLength. + Build-And-Send-A-Data-Burst(Connection, + + data-descriptor, TCB); + } else { /* R2T */ + Create a data-descriptor for the data burst + from BegRun and RunLength. + Build-And-Send-R2T(Connection, data-descriptor, + TCB); + } + } else { + snack-failure = TRUE; + } + } else if (CurrentPDU.type == status) { + Handle-Status-SNACK-request(Connection, CurrentPDU); + } else if (CurrentPDU.type == DataACK) { + Consider all data upto CurrentPDU.BegRun as + acknowledged. + Free up the retransmission resources for that data. + } else if (CurrentPDU.type == R-Data SNACK) { + + + +Satran, et al. Standards Track [Page 238] + +RFC 3720 iSCSI April 2004 + + + Create a data descriptor for a data burst covering + all unacknowledged data. + Build-And-Send-A-Data-Burst(Connection, + data-descriptor, TCB); + TCB.SNACK_Tag = CurrentPDU.SNACK_Tag; + if (there's no more data to send) { + Build-And-Send-Status(Connection, TCB); + } + } + } else { /* operational ErrorRecoveryLevel = 0 */ + snack-failure = TRUE; + + } + if (snack-failure == TRUE) { + Build-And-Send-Reject(Connection, CurrentPDU, + SNACK-Reject); + if (TCB.StatusXferd != TRUE) { + TCB.Reason = "SNACK Rejected"; + Build-And-Send-Status(Connection, TCB); + } + } + + } else { /* REST UNRELATED TO WITHIN-COMMAND-RECOVERY, NOT SHOWN */ + } +} + +Transfer-Context-Timeout-Handler(TContext) +{ + Retrieve TCB and Connection from TContext. + Decrement TCB.ActiveR2Ts. + if (operational ErrorRecoveryLevel > 0 and + task is not already considered failed) { + Note the missing data PDUs in MissingDataRange[]. + Create a data-descriptor for the data burst + from MissingDataRange[]. + Build-And-Send-R2T(Connection, data-descriptor, TCB); + } else { + TCB.Reason = "Protocol service CRC error"; + if (TCB.ActiveR2Ts = 0) { + Build-And-Send-Status(Connection, TCB); + } + } +} + + + + + + + + +Satran, et al. Standards Track [Page 239] + +RFC 3720 iSCSI April 2004 + + +E.3. Within-connection Recovery Algorithms + +E.3.1. Procedure Descriptions + +Procedure descriptions: +Recover-Status-if-Possible(transport connection, + currently received PDU); +Evaluate-a-StatSN(transport connection, currently received PDU); +Retransmit-Command-if-Possible(transport connection, CmdSN); +Build-And-Send-SSnack(transport connection); +Build-And-Send-Command(transport connection, task control block); +Command-Acknowledge-Timeout-Handler(task control block); +Status-Expect-Timeout-Handler(transport connection); +Build-And-Send-Nop-Out(transport connection); +Handle-Status-SNACK-request(transport connection, status SNACK +PDU); +Retransmit-Status-Burst(status SNACK, task control block); +Is-Acknowledged(beginning StatSN, run length); + +Implementation-specific tunables: +InitiatorProactiveSNACKEnabled + + Notes: + + - The initiator algorithms only deal with unsolicited Nop-In PDUs + for generating status SNACKs. A solicited Nop-In PDU has an + assigned StatSN, which, when out of order, could trigger the + out of order StatSN handling in Within-command algorithms, + again leading to Recover-Status-if-Possible. + + + - The pseudo-code shown may result in the retransmission of + unacknowledged commands in more cases than necessary. This + will not, however, affect the correctness of the operation + because the target is required to discard the duplicate CmdSNs. + + - The procedure Build-And-Send-Async is defined in the Connection + recovery algorithms. + + - The procedure Status-Expect-Timeout-Handler describes how + initiators may proactively attempt to retrieve the Status if + they so choose. This procedure is assumed to be triggered much + before the standard ULP timeout. + + + + + + + + +Satran, et al. Standards Track [Page 240] + +RFC 3720 iSCSI April 2004 + + +E.3.2. Initiator Algorithms + +Recover-Status-if-Possible(Connection, CurrentPDU) +{ + if ((Connection.state == LOGGED_IN) and + connection is not already considered failed) { + if (operational ErrorRecoveryLevel > 0) { + if (# of missing PDUs is trackable) { + Note the missing StatSNs in Connection + that were not already requested with SNACK; + Build-And-Send-SSnack(Connection); + } else { + Connection.PerformConnectionCleanup = TRUE; + } + } else { + Connection.PerformConnectionCleanup = TRUE; + } + if (Connection.PerformConnectionCleanup == TRUE) { + Start-Timer(Connection-Cleanup-Handler, Connection, 0); + } + } +} + +Retransmit-Command-if-Possible(Connection, CmdSN) +{ + + if (operational ErrorRecoveryLevel > 0) { + Retrieve the InitiatorTaskTag, and thus TCB for the CmdSN. + Build-And-Send-Command(Connection, TCB); + } +} + +Evaluate-a-StatSN(Connection, CurrentPDU) +{ + send-status-SNACK = FALSE; + if (Connection.SoFarInOrder == TRUE) { + if (current StatSN is the expected) { + Increment Connection.ExpectedStatSN. + } else { + Connection.SoFarInOrder = FALSE; + send-status-SNACK = TRUE; + } + } else { + if (current StatSN was considered missing) { + remove current StatSN from the missing list. + } else { + if (current StatSN is higher than expected){ + send-status-SNACK = TRUE; + + + +Satran, et al. Standards Track [Page 241] + +RFC 3720 iSCSI April 2004 + + + } else { + send-status-SNACK = FALSE; + discard the PDU; + } + } + Adjust Connection.ExpectedStatSN if appropriate. + if (missing StatSN list is empty) { + Connection.SoFarInOrder = TRUE; + } + } + return send-status-SNACK; +} + +Receive-a-In-PDU(Connection, CurrentPDU) +{ + check-basic-validity(CurrentPDU); + if (Header-Digest-Bad) discard, return; + Retrieve TCB for CurrentPDU.InitiatorTaskTag. + if (CurrentPDU.type == Nop-In) { + if (the PDU is unsolicited) { + if (current StatSN is not expected) { + Recover-Status-if-Possible(Connection, + CurrentPDU); + } + if (current ExpCmdSN is not Session.CmdSN) { + Retransmit-Command-if-Possible(Connection, + CurrentPDU.ExpCmdSN); + } + } + } else if (CurrentPDU.type == Reject) { + if (it is a data digest error on immediate data) { + Retransmit-Command-if-Possible(Connection, + CurrentPDU.BadPDUHeader.CmdSN); + } + } else if (CurrentPDU.type == Response) { + send-status-SNACK = Evaluate-a-StatSN(Connection, + CurrentPDU); + if (send-status-SNACK == TRUE) + Recover-Status-if-Possible(Connection, CurrentPDU); + } else { /* REST UNRELATED TO WITHIN-CONNECTION-RECOVERY, + * NOT SHOWN */ + } +} + +Command-Acknowledge-Timeout-Handler(TCB) +{ + Retrieve the Connection for TCB. + Retransmit-Command-if-Possible(Connection, TCB.CmdSN); + + + +Satran, et al. Standards Track [Page 242] + +RFC 3720 iSCSI April 2004 + + +} + +Status-Expect-Timeout-Handler(Connection) +{ + if (operational ErrorRecoveryLevel > 0) { + Build-And-Send-Nop-Out(Connection); + } else if (InitiatorProactiveSNACKEnabled){ + if ((Connection.state == LOGGED_IN) and + connection is not already considered failed) { + Build-And-Send-SSnack(Connection); + } + } +} + +E.3.3. Target Algorithms + +Handle-Status-SNACK-request(Connection, CurrentPDU) +{ + if (operational ErrorRecoveryLevel > 0) { + if (request for an acknowledged run) { + Build-And-Send-Reject(Connection, CurrentPDU, + Protocol-Error); + } else if (request for an untransmitted run) { + discard, return; + } else { + Retransmit-Status-Burst(CurrentPDU, TCB); + } else { + Build-And-Send-Async(Connection, DroppedConnection, + DefaultTime2Wait, + DefaultTime2Retain); + } +} + +E.4. Connection Recovery Algorithms + +E.4.1. Procedure Descriptions + +Build-And-Send-Async(transport connection, reason code, + minimum time, maximum time); +Pick-A-Logged-In-Connection(session); +Build-And-Send-Logout(transport connection, logout connection + identifier, reason code); +PerformImplicitLogout(transport connection, logout connection + identifier, target information); +PerformLogin(transport connection, target information); +CreateNewTransportConnection(target information); +Build-And-Send-Command(transport connection, task control block); +Connection-Cleanup-Handler(transport connection); + + + +Satran, et al. Standards Track [Page 243] + +RFC 3720 iSCSI April 2004 + + +Connection-Resource-Timeout-Handler(transport connection); +Quiesce-And-Prepare-for-New-Allegiance(session, task control +block); +Build-And-Send-Logout-Response(transport connection, + CID of connection in recovery, reason +code); +Build-And-Send-TaskMgmt-Response(transport connection, + task mgmt command PDU, response code); +Establish-New-Allegiance(task control block, transport +connection); +Schedule-Command-To-Continue(task control block); + +Notes: + - Transport exception conditions, such as unexpected connection + termination, connection reset, and hung connection while the + connection is in the full-feature phase, are all assumed to be + asynchronously signaled to the iSCSI layer using the + Transport_Exception_Handler procedure. + +E.4.2. Initiator Algorithms + + Receive-a-In-PDU(Connection, CurrentPDU) { + check-basic-validity(CurrentPDU); + if (Header-Digest-Bad) discard, return; + + Retrieve TCB from CurrentPDU.InitiatorTaskTag. + if (CurrentPDU.type == Async) { + if (CurrentPDU.AsyncEvent == ConnectionDropped) { + Retrieve the AffectedConnection for + CurrentPDU.Parameter1. + AffectedConnection.CurrentTimeout = + CurrentPDU.Parameter3; + AffectedConnection.State = CLEANUP_WAIT; + Start-Timer(Connection-Cleanup-Handler, + AffectedConnection, + CurrentPDU.Parameter2); + } else if (CurrentPDU.AsyncEvent == LogoutRequest)) { + AffectedConnection = Connection; + AffectedConnection.State = LOGOUT_REQUESTED; + AffectedConnection.PerformConnectionCleanup = TRUE; + AffectedConnection.CurrentTimeout = + CurrentPDU.Parameter3; + Start-Timer(Connection-Cleanup-Handler, + AffectedConnection, 0); + } else if (CurrentPDU.AsyncEvent == SessionDropped)) { + for (each Connection) { + Connection.State = CLEANUP_WAIT; + Connection.CurrentTimeout = CurrentPDU.Parameter3; + + + +Satran, et al. Standards Track [Page 244] + +RFC 3720 iSCSI April 2004 + + + Start-Timer(Connection-Cleanup-Handler, + Connection, CurrentPDU.Parameter2); + } + Session.state = FAILED; + } + + } else if (CurrentPDU.type == LogoutResponse) { + Retrieve the CleanupConnection for CurrentPDU.CID. + if (CurrentPDU.Response = failure) { + CleanupConnection.State = CLEANUP_WAIT; + } else { + CleanupConnection.State = FREE; + } + } else if (CurrentPDU.type == LoginResponse) { + if (this is a response to an implicit Logout) { + Retrieve the CleanupConnection. + if (successful) { + CleanupConnection.State = FREE; + Connection.State = LOGGED_IN; + } else { + CleanupConnection.State = CLEANUP_WAIT; + DestroyTransportConnection(Connection); + } + } + } else { /* REST UNRELATED TO CONNECTION-RECOVERY, + + * NOT SHOWN */ + } + if (CleanupConnection.State == FREE) { + for (each command that was active on CleanupConnection) { + /* Establish new connection allegiance */ + NewConnection = Pick-A-Logged-In-Connection(Session); + Build-And-Send-Command(NewConnection, TCB); + } + } } + + Connection-Cleanup-Handler(Connection) { + Retrieve Session from Connection. + if (Connection can still exchange iSCSI PDUs) { + NewConnection = Connection; + } else { + Start-Timer(Connection-Resource-Timeout-Handler, + Connection, Connection.CurrentTimeout); + if (there are other logged-in connections) { + NewConnection = Pick-A-Logged-In- + Connection(Session); + } else { + NewConnection = + + + +Satran, et al. Standards Track [Page 245] + +RFC 3720 iSCSI April 2004 + + + CreateTransportConnection(Session.OtherEndInfo); + Initiate an implicit Logout on NewConnection for + Connection.CID. + return; + } + } + Build-And-Send-Logout(NewConnection, Connection.CID, + RecoveryRemove); } + + Transport_Exception_Handler(Connection) { + Connection.PerformConnectionCleanup = TRUE; + if (the event is an unexpected transport disconnect) { + Connection.State = CLEANUP_WAIT; + + Connection.CurrentTimeout = DefaultTime2Retain; + Start-Timer(Connection-Cleanup-Handler, Connection, + DefaultTime2Wait); + + } else { + Connection.State = FREE; + } } + +E.4.3. Target Algorithms + + Receive-a-In-PDU(Connection, CurrentPDU) + { + check-basic-validity(CurrentPDU); + if (Header-Digest-Bad) discard, return; + else if (Data-Digest-Bad) { + Build-And-Send-Reject(Connection, CurrentPDU, + Payload-Digest-Error); + discard, return; + } + Retrieve TCB and Session. + if (CurrentPDU.type == Logout) { + if (CurrentPDU.ReasonCode = RecoveryRemove) { + Retrieve the CleanupConnection from CurrentPDU.CID). + for (each command active on CleanupConnection) { + Quiesce-And-Prepare-for-New-Allegiance(Session, + TCB); + TCB.CurrentlyAllegiant = FALSE; + } + Cleanup-Connection-State(CleanupConnection); + if ((quiescing successful) and (cleanup successful)) { + Build-And-Send-Logout-Response(Connection, + CleanupConnection.CID, Success); + } else { + Build-And-Send-Logout-Response(Connection, + + + +Satran, et al. Standards Track [Page 246] + +RFC 3720 iSCSI April 2004 + + + CleanupConnection.CID, Failure); + } + } + } else if ((CurrentPDU.type == Login) and + operational ErrorRecoveryLevel == 2) { + Retrieve the CleanupConnection from CurrentPDU.CID). + for (each command active on CleanupConnection) { + Quiesce-And-Prepare-for-New-Allegiance(Session, TCB); + TCB.CurrentlyAllegiant = FALSE; + } + Cleanup-Connection-State(CleanupConnection); + if ((quiescing successful) and (cleanup successful)) { + Continue with the rest of the Login processing; + } else { + Build-And-Send-Login-Response(Connection, + CleanupConnection.CID, Target Error); + } + } + + } else if (CurrentPDU.type == TaskManagement) { + if (CurrentPDU.function == "TaskReassign") { + if (Session.ErrorRecoveryLevel < 2) { + Build-And-Send-TaskMgmt-Response(Connection, + CurrentPDU, "Allegiance reassignment + not supported"); + } else if (task is not found) { + Build-And-Send-TaskMgmt-Response(Connection, + CurrentPDU, "Task not in task set"); + } else if (task is currently allegiant) { + Build-And-Send-TaskMgmt-Response(Connection, + CurrentPDU, "Task still allegiant"); + } else { + Establish-New-Allegiance(TCB, Connection); + TCB.CurrentlyAllegiant = TRUE; + Schedule-Command-To-Continue(TCB); + } + } + } else { /* REST UNRELATED TO CONNECTION-RECOVERY, + * NOT SHOWN */ + } + } + + Transport_Exception_Handler(Connection) + { + Connection.PerformConnectionCleanup = TRUE; + if (the event is an unexpected transport disconnect) { + Connection.State = CLEANUP_WAIT; + Start-Timer(Connection-Resource-Timeout-Handler, + + + +Satran, et al. Standards Track [Page 247] + +RFC 3720 iSCSI April 2004 + + + Connection, + + (DefaultTime2Wait+DefaultTime2Retain)); + if (this Session has full-feature phase connections + left) + { + DifferentConnection = + Pick-A-Logged-In-Connection(Session); + Build-And-Send-Async(DifferentConnection, + DroppedConnection, DefaultTime2Wait, + DefaultTime2Retain); + } + } else { + Connection.State = FREE; + } + } + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 248] + +RFC 3720 iSCSI April 2004 + + +Appendix F. Clearing Effects of Various Events on Targets + +F.1. Clearing Effects on iSCSI Objects + + The following tables describe the target behavior on receiving the + events specified in the rows of the table. The second table is an + extension of the first table and defines clearing actions for more + objects on the same events. The legend is: + + Y = Yes (cleared/discarded/reset on the event specified in the + row). Unless otherwise noted, the clearing action is only + applicable for the issuing initiator port. + N = No (not affected on the event specified in the row, i.e., + stays at previous value). + NA = Not Applicable or Not Defined. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 249] + +RFC 3720 iSCSI April 2004 + + + +-----+-----+-----+-----+-----+ + |IT(1)|IC(2)|CT(5)|ST(6)|PP(7)| + +---------------------+-----+-----+-----+-----+-----+ + |connection failure(8)|Y |Y |N |N |Y | + +---------------------+-----+-----+-----+-----+-----+ + |connection state |NA |NA |Y |N |NA | + |timeout (9) | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |session timeout/ |Y |Y |Y |Y |Y(14)| + |closure/reinstatement| | | | | | + |(10) | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |session continuation |NA |NA |N(11)|N |NA | + |(12) | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |successful connection|Y |Y |Y |N |Y(13)| + |close logout | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |session failure (18) |Y |Y |N |N |Y | + +---------------------+-----+-----+-----+-----+-----+ + |successful recovery |Y |Y |N |N |Y(13)| + |Logout | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |failed Logout |Y |Y |N |N |Y | + +---------------------+-----+-----+-----+-----+-----+ + |connection Login |NA |NA |NA |Y(15)|NA | + |(leading) | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |connection Login |NA |NA |N(11)|N |Y | + |(non-leading) | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |target cold reset(16)|Y |Y |Y |Y |Y | + +---------------------+-----+-----+-----+-----+-----+ + |target warm reset(16)|Y |Y |Y |Y |Y | + +---------------------+-----+-----+-----+-----+-----+ + |LU reset(19) |Y |Y |Y |Y |Y | + +---------------------+-----+-----+-----+-----+-----+ + |powercycle(16) |Y |Y |Y |Y |Y | + +---------------------+-----+-----+-----+-----+-----+ + + 1. Incomplete TTTs - Target Transfer Tags on which the target is + still expecting PDUs to be received. Examples include TTTs received + via R2T, NOP-IN, etc. + + 2. Immediate Commands - immediate commands, but waiting for + execution on a target. For example, Abort Task Set. + + + + + +Satran, et al. Standards Track [Page 250] + +RFC 3720 iSCSI April 2004 + + + 5. Connection Tasks - tasks that are active on the iSCSI connection + in question. + + 6. Session Tasks - tasks that are active on the entire iSCSI + session. A union of "connection tasks" on all participating + connections. + + 7. Partial PDUs (if any) - PDUs that are partially sent and waiting + for transport window credit to complete the transmission. + + 8. Connection failure is a connection exception condition - one of + the transport connections shutdown, transport connections reset, or + transport connections timed out, which abruptly terminated the iSCSI + full-feature phase connection. A connection failure always takes the + connection state machine to the CLEANUP_WAIT state. + + 9. Connection state timeout happens if a connection spends more time + that agreed upon during Login negotiation in the CLEANUP_WAIT state, + and this takes the connection to the FREE state (M1 transition in + connection cleanup state diagram). + + 10. These are defined in Section 5.3.5 Session Reinstatement, + Closure, and Timeout. + + 11. This clearing effect is "Y" only if it is a connection + reinstatement and the operational ErrorRecoveryLevel is less than 2. + + 12. Session continuation is defined in Section 5.3.6 Session + Continuation and Failure. + + 13. This clearing effect is only valid if the connection is being + logged out on a different connection and when the connection being + logged out on the target may have some partial PDUs pending to be + sent. In all other cases, the effect is "NA". + + 14. This clearing effect is only valid for a "close the session" + logout in a multi-connection session. In all other cases, the effect + is "NA". + + 15. Only applicable if this leading connection login is a session + reinstatement. If this is not the case, it is "NA". + + 16. This operation affects all logged-in initiators. + + 18. Session failure is defined in Section 5.3.6 Session Continuation + and Failure. + + + + + +Satran, et al. Standards Track [Page 251] + +RFC 3720 iSCSI April 2004 + + + 19. This operation affects all logged-in initiators and the clearing + effects are only applicable to the LU being reset. + + +-----+-----+-----+-----+-----+ + |DC(1)|DD(2)|SS(3)|CS(4)|DS(5)| + +---------------------+-----+-----+-----+-----+-----+ + |connection failure |N |Y |N |N |N | + +---------------------+-----+-----+-----+-----+-----+ + |connection state |Y |NA |Y |N |NA | + |timeout | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |session timeout/ |Y |Y |Y(7) |Y |NA | + |closure/reinstatement| | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |session continuation |N(11)|NA*12|NA |N |NA*13| + +---------------------+-----+-----+-----+-----+-----+ + |successful connection|Y |Y |Y |N |NA | + |close Logout | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |session failure |N |Y |N |N |N | + +---------------------+-----+-----+-----+-----+-----+ + |successful recovery |Y |Y |Y |N |N | + |Logout | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |failed Logout |N |Y(9) |N |N |N | + +---------------------+-----+-----+-----+-----+-----+ + |connection Login |NA |NA |N(8) |N(8) |NA | + |(leading | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |connection Login |N(11)|NA*12|N(8) |N |NA*13| + |(non-leading) | | | | | | + +---------------------+-----+-----+-----+-----+-----+ + |target cold reset |Y |Y |Y |Y(10)|NA | + +---------------------+-----+-----+-----+-----+-----+ + |target warm reset |Y |Y |N |N |NA | + +---------------------+-----+-----+-----+-----+-----+ + |LU reset |N |Y |N |N |N | + +---------------------+-----+-----+-----+-----+-----+ + |powercycle |Y |Y |Y |Y(10)|NA | + +---------------------+-----+-----+-----+-----+-----+ + + 1. Discontiguous Commands - commands allegiant to the connection in + question and waiting to be reordered in the iSCSI layer. All "Y"s in + this column assume that the task causing the event (if indeed the + event is the result of a task) is issued as an immediate command, + because the discontiguities can be ahead of the task. + + + + + +Satran, et al. Standards Track [Page 252] + +RFC 3720 iSCSI April 2004 + + + 2. Discontiguous Data - data PDUs received for the task in question + and waiting to be reordered due to prior discontiguities in DataSN. + + 3. StatSN + + 4. CmdSN + + 5. DataSN + + 7. It clears the StatSN on all the connections. + + 8. This sequence number is instantiated on this event. + + 9. A logout failure drives the connection state machine to the + CLEANUP_WAIT state, similar to the connection failure event. Hence, + it has a similar effect on this and several other protocol aspects. + + 10. This is cleared by virtue of the fact that all sessions with all + initiators are terminated. + + 11. This clearing effect is "Y" if it is a connection reinstatement. + + 12. This clearing effect is "Y" only if it is a connection + reinstatement and the operational ErrorRecoveryLevel is 2. + + 13. This clearing effect is "N" only if it is a connection + reinstatement and the operational ErrorRecoveryLevel is 2. + +F.2. Clearing Effects on SCSI Objects + + The only iSCSI protocol action that can effect clearing actions on + SCSI objects is the "I_T nexus loss" notification (Section 4.3.5.1 + Loss of Nexus notification). [SPC3] describes the clearing effects + of this notification on a variety of SCSI attributes. In addition, + SCSI standards documents (such as [SAM2] and [SBC]) define additional + clearing actions that may take place for several SCSI objects on SCSI + events such as LU resets and power-on resets. + + Since iSCSI defines a target cold reset as a protocol-equivalent to a + target power-cycle, the iSCSI target cold reset must also be + considered as the power-on reset event in interpreting the actions + defined in the SCSI standards. + + When the iSCSI session is reconstructed (between the same SCSI ports + with the same nexus identifier) reestablishing the same I_T nexus, + all SCSI objects that are defined to not clear on the "I_T nexus + loss" notification event, such as persistent reservations, are + automatically associated to this new session. + + + +Satran, et al. Standards Track [Page 253] + +RFC 3720 iSCSI April 2004 + + +Acknowledgements + + This protocol was developed by a design team that, in addition to the + authors, included Daniel Smith, Ofer Biran, Jim Hafner and John + Hufferd (IBM), Mark Bakke (Cisco), Randy Haagens (HP), Matt Wakeley + (Agilent, now Sierra Logic), Luciano Dalle Ore (Quantum), and Paul + Von Stamwitz (Adaptec, now TrueSAN Networks). + + Furthermore, a large group of people contributed to this work through + their review, comments, and valuable insights. We are grateful to + all of them. We especially thank those people who found the time and + patience to take part in our weekly phone conferences and + intermediate meetings in Almaden and Haifa, which helped shape this + document: Prasenjit Sarkar, Meir Toledano, John Dowdy, Steve Legg, + Alain Azagury (IBM), Dave Nagle (CMU), David Black (EMC), John Matze + (Veritas - now Okapi Software), Steve DeGroote, Mark Schrandt + (Cisco), Gabi Hecht (Gadzoox), Robert Snively and Brian Forbes + (Brocade), Nelson Nachum (StorAge), and Uri Elzur (Broadcom). Many + others helped edit and improve this document within the IPS working + group. We are especially grateful to David Robinson and Raghavendra + Rao (Sun), Charles Monia, Joshua Tseng (Nishan), Somesh Gupta + (Silverback), Michael Krause, Pierre Labat, Santosh Rao, Matthew + Burbridge, Bob Barry, Robert Elliott, Nick Martin (HP), Stephen + Bailey (Sandburst), Steve Senum, Ayman Ghanem, Dave Peterson (Cisco), + Barry Reinhold (Trebia Networks), Bob Russell (UNH), Eddy Quicksall + (iVivity, Inc.), Bill Lynn and Michael Fischer (Adaptec), Vince + Cavanna, Pat Thaler (Agilent), Jonathan Stone (Stanford), Luben + Tuikov (Splentec), Paul Koning (EqualLogic), Michael Krueger + (Windriver), Martins Krikis (Intel), Doug Otis (Sanlight), John + Marberg (IBM), Robert Griswold and Bill Moody (Crossroads), Bill + Studenmund (Wasabi Systems), Elizabeth Rodriguez (Brocade) and Yaron + Klein (Sanrad). The recovery chapter was enhanced with the help of + Stephen Bailey (Sandburst), Somesh Gupta (Silverback), and Venkat + Rangan (Rhapsody Networks). Eddy Quicksall contributed some examples + and began the Definitions section. Michael Fischer and Bob Barry + started the Acronyms section. Last, but not least, we thank Ralph + Weber for keeping us in line with T10 (SCSI) standardization. + + We would like to thank Steve Hetzler for his unwavering support and + for coming up with such a good name for the protocol, and Micky + Rodeh, Jai Menon, Clod Barrera, and Andy Bechtolsheim for helping + make this work happen. + + In addition to this document, we recommend you acquaint yourself with + the following in order to get a full understanding of the iSCSI + specification: "iSCSI Naming & Discovery"[RFC3721], "Bootstrapping + Clients using the iSCSI Protocol" [BOOT], "Securing Block Storage + Protocols over IP" [RFC3723] documents, "iSCSI Requirements and + + + +Satran, et al. Standards Track [Page 254] + +RFC 3720 iSCSI April 2004 + + + Design Considerations" [RFC3347] and "SCSI Command Ordering + Considerations with iSCSI" [CORD]. + + The "iSCSI Naming & Discovery" document is authored by: + + Mark Bakke (Cisco), Jim Hafner, John Hufferd, Kaladhar Voruganti + (IBM), and Marjorie Krueger (HP). + + The "Bootstrapping Clients using the iSCSI Protocol" document is + authored by: + + Prasenjit Sarkar (IBM), Duncan Missimer (HP), and Costa + Sapuntzakis (Cisco). + + The "Securing Block Storage Protocols over IP" document is authored + by: + + Bernard Aboba (Microsoft), Joshua Tseng (Nishan), Jesse Walker + (Intel), Venkat Rangan (Rhapsody Networks), and Franco + Travostino (Nortel Networks). + + The "iSCSI Requirements and Design Considerations" document is + authored by: + + Marjorie Krueger, Randy Haagens (HP), Costa Sapuntzakis, and Mark + Bakke (Cisco). + + The "SCSI Command Ordering Considerations with iSCSI" document is + authored by: + + Mallikarjun Chadalapaka, Rob Elliot (HP) + + We are grateful to all of them for their good work and for helping us + correlate this document with the ones they produced. + + + + + + + + + + + + + + + + + +Satran, et al. Standards Track [Page 255] + +RFC 3720 iSCSI April 2004 + + +Authors' Addresses + + Julian Satran + IBM Research Laboratory in Haifa + Haifa University Campus - Mount Carmel + Haifa 31905, Israel + + Phone +972.4.829.6264 + EMail: Julian_Satran@il.ibm.com + + + Kalman Meth + IBM Research Laboratory in Haifa + Haifa University Campus - Mount Carmel + Haifa 31905, Israel + + Phone +972.4.829.6341 + EMail: meth@il.ibm.com + + + Costa Sapuntzakis + Stanford University + 353 Serra Mall Dr #407 + Stanford, CA 94305 + + Phone: +1.650.723.2458 + EMail: csapuntz@alum.mit.edu + + + Efri Zeidner + XIV Ltd. + 1 Azrieli Center, + Tel-Aviv 67021, Israel + + Phone: +972.3.607.4722 + EMail: efri@xiv.co.il + + + Mallikarjun Chadalapaka + Hewlett-Packard Company + 8000 Foothills Blvd. + Roseville, CA 95747-5668, USA + + Phone: +1.916.785.5621 + EMail: cbm@rose.hp.com + + + + + + +Satran, et al. Standards Track [Page 256] + +RFC 3720 iSCSI April 2004 + + +Full Copyright Statement + + Copyright (C) The Internet Society (2004). This document is subject + to the rights, licenses and restrictions contained in BCP 78, and + except as set forth therein, the authors retain all their rights. + + This document and the information contained herein are provided on an + "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS + OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET + ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, + INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE + INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED + WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. + +Intellectual Property + + The IETF takes no position regarding the validity or scope of any + Intellectual Property Rights or other rights that might be claimed to + pertain to the implementation or use of the technology described in + this document or the extent to which any license under such rights + might or might not be available; nor does it represent that it has + made any independent effort to identify any such rights. Information + on the procedures with respect to rights in RFC documents can be + found in BCP 78 and BCP 79. + + Copies of IPR disclosures made to the IETF Secretariat and any + assurances of licenses to be made available, or the result of an + attempt made to obtain a general license or permission for the use of + such proprietary rights by implementers or users of this + specification can be obtained from the IETF on-line IPR repository at + http://www.ietf.org/ipr. + + The IETF invites any interested party to bring to its attention any + copyrights, patents or patent applications, or other proprietary + rights that may cover technology that may be required to implement + this standard. Please address the information to the IETF at ietf- + ipr@ietf.org. + +Acknowledgement + + Funding for the RFC Editor function is currently provided by the + Internet Society. + + + + + + + + + +Satran, et al. Standards Track [Page 257] + diff --git a/Bachelor/BSc-Arbeit/mat_bsc_arbeit/Quellen/SEI-2007.pdf b/Bachelor/BSc-Arbeit/mat_bsc_arbeit/Quellen/SEI-2007.pdf Binary files differnew file mode 100644 index 0000000..4f80e50 --- /dev/null +++ b/Bachelor/BSc-Arbeit/mat_bsc_arbeit/Quellen/SEI-2007.pdf diff --git a/Bachelor/BSc-Arbeit/mat_bsc_arbeit/Quellen/SPE-2004.pdf b/Bachelor/BSc-Arbeit/mat_bsc_arbeit/Quellen/SPE-2004.pdf Binary files differnew file mode 100644 index 0000000..22b3aa4 --- /dev/null +++ b/Bachelor/BSc-Arbeit/mat_bsc_arbeit/Quellen/SPE-2004.pdf diff --git a/Bachelor/BSc-Arbeit/mat_bsc_arbeit/Quellen/SUN-1999.ps b/Bachelor/BSc-Arbeit/mat_bsc_arbeit/Quellen/SUN-1999.ps new file mode 100644 index 0000000..22fca8d --- /dev/null +++ b/Bachelor/BSc-Arbeit/mat_bsc_arbeit/Quellen/SUN-1999.ps @@ -0,0 +1,14251 @@ +%!PS-Adobe-1.0 +%%Creator: setsuko:vss (V.S.Sunderam,216 Fishburne,7275926,2974135) +%%Title: stdin (ditroff) +%%CreationDate: Sun Aug 5 09:43:41 1990 +%%EndComments +% Start of psdit.pro -- prolog for ditroff translator +% Copyright (c) 1985,1987 Adobe Systems Incorporated. All Rights Reserved. +% GOVERNMENT END USERS: See Notice file in TranScript library directory +% -- probably /usr/lib/ps/Notice +% RCS: $Header: psdit.pro,v 2.2 87/11/17 16:40:42 byron Rel $ +/$DITroff 140 dict def $DITroff begin + +%% Psfig additions +/DocumentInitState [ matrix currentmatrix currentlinewidth currentlinecap +currentlinejoin currentdash currentgray currentmiterlimit ] cvx def + +/startFig { + /SavedState save def + userdict maxlength dict begin + currentpoint transform + + DocumentInitState setmiterlimit setgray setdash setlinejoin setlinecap + setlinewidth setmatrix + + itransform moveto + + /ury exch def + /urx exch def + /lly exch def + /llx exch def + /y exch 72 mul resolution div def + /x exch 72 mul resolution div def + + currentpoint /cy exch def /cx exch def + + /sx x urx llx sub div def % scaling for x + /sy y ury lly sub div def % scaling for y + + sx sy scale % scale by (sx,sy) + + cx sx div llx sub + cy sy div ury sub translate + + /DefFigCTM matrix currentmatrix def + + /initmatrix { + DefFigCTM setmatrix + } def + /defaultmatrix { + DefFigCTM exch copy + } def + + /initgraphics { + DocumentInitState setmiterlimit setgray setdash + setlinejoin setlinecap setlinewidth setmatrix + DefFigCTM setmatrix + } def + + /showpage { + initgraphics + } def + +} def +% Args are llx lly urx ury (in figure coordinates) +/clipFig { + currentpoint 6 2 roll + newpath 4 copy + 4 2 roll moveto + 6 -1 roll exch lineto + exch lineto + exch lineto + closepath clip + newpath + moveto +} def +% doclip, if called, will always be just after a `startfig' +/doclip { llx lly urx ury clipFig } def +/endFig { + end SavedState restore +} def +/globalstart { + % Push details about the enviornment on the stack. + fontnum fontsize fontslant fontheight firstpage + mh my resolution slotno currentpoint + pagesave restore gsave +} def +/globalend { + grestore moveto + /slotno exch def /resolution exch def /my exch def + /mh exch def /firstpage exch def /fontheight exch def + /fontslant exch def /fontsize exch def /fontnum exch def + F + /pagesave save def +} def + +%% end XMOD additions + +/fontnum 1 def /fontsize 10 def /fontheight 10 def /fontslant 0 def +/xi {0 72 11 mul translate 72 resolution div dup neg scale 0 0 moveto + /fontnum 1 def /fontsize 10 def /fontheight 10 def /fontslant 0 def F + /pagesave save def}def +/PB{save /psv exch def currentpoint translate + resolution 72 div dup neg scale 0 0 moveto}def +/PE{psv restore}def +/m1 matrix def /m2 matrix def /m3 matrix def /oldmat matrix def +/tan{dup sin exch cos div}bind def +/point{resolution 72 div mul}bind def +/dround {transform round exch round exch itransform}bind def +/xT{/devname exch def}def +/xr{/mh exch def /my exch def /resolution exch def}def +/xp{}def +/xs{docsave restore end}def +/xt{}def +/xf{/fontname exch def /slotno exch def fontnames slotno get fontname eq not + {fonts slotno fontname findfont put fontnames slotno fontname put}if}def +/xH{/fontheight exch def F}bind def +/xS{/fontslant exch def F}bind def +/s{/fontsize exch def /fontheight fontsize def F}bind def +/f{/fontnum exch def F}bind def +/F{fontheight 0 le {/fontheight fontsize def}if + fonts fontnum get fontsize point 0 0 fontheight point neg 0 0 m1 astore + fontslant 0 ne{1 0 fontslant tan 1 0 0 m2 astore m3 concatmatrix}if + makefont setfont .04 fontsize point mul 0 dround pop setlinewidth}bind def +/X{exch currentpoint exch pop moveto show}bind def +/N{3 1 roll moveto show}bind def +/Y{exch currentpoint pop exch moveto show}bind def +/S /show load def +/ditpush{}def/ditpop{}def +/AX{3 -1 roll currentpoint exch pop moveto 0 exch ashow}bind def +/AN{4 2 roll moveto 0 exch ashow}bind def +/AY{3 -1 roll currentpoint pop exch moveto 0 exch ashow}bind def +/AS{0 exch ashow}bind def +/MX{currentpoint exch pop moveto}bind def +/MY{currentpoint pop exch moveto}bind def +/MXY /moveto load def +/cb{pop}def % action on unknown char -- nothing for now +/n{}def/w{}def +/p{pop showpage pagesave restore /pagesave save def}def +/abspoint{currentpoint exch pop add exch currentpoint pop add exch}def +/dstroke{currentpoint stroke moveto}bind def +/Dl{2 copy gsave rlineto stroke grestore rmoveto}bind def +/arcellipse{oldmat currentmatrix pop + currentpoint translate 1 diamv diamh div scale /rad diamh 2 div def + rad 0 rad -180 180 arc oldmat setmatrix}def +/Dc{gsave dup /diamv exch def /diamh exch def arcellipse dstroke + grestore diamh 0 rmoveto}def +/De{gsave /diamv exch def /diamh exch def arcellipse dstroke + grestore diamh 0 rmoveto}def +/Da{currentpoint /by exch def /bx exch def /fy exch def /fx exch def + /cy exch def /cx exch def /rad cx cx mul cy cy mul add sqrt def + /ang1 cy neg cx neg atan def /ang2 fy fx atan def cx bx add cy by add + 2 copy rad ang1 ang2 arcn stroke exch fx add exch fy add moveto}def +/Barray 200 array def % 200 values in a wiggle +/D~{mark}def +/D~~{counttomark Barray exch 0 exch getinterval astore /Bcontrol exch def pop + /Blen Bcontrol length def Blen 4 ge Blen 2 mod 0 eq and + {Bcontrol 0 get Bcontrol 1 get abspoint /Ycont exch def /Xcont exch def + Bcontrol 0 2 copy get 2 mul put Bcontrol 1 2 copy get 2 mul put + Bcontrol Blen 2 sub 2 copy get 2 mul put + Bcontrol Blen 1 sub 2 copy get 2 mul put + /Ybi /Xbi currentpoint 3 1 roll def def 0 2 Blen 4 sub + {/i exch def + Bcontrol i get 3 div Bcontrol i 1 add get 3 div + Bcontrol i get 3 mul Bcontrol i 2 add get add 6 div + Bcontrol i 1 add get 3 mul Bcontrol i 3 add get add 6 div + /Xbi Xcont Bcontrol i 2 add get 2 div add def + /Ybi Ycont Bcontrol i 3 add get 2 div add def + /Xcont Xcont Bcontrol i 2 add get add def + /Ycont Ycont Bcontrol i 3 add get add def + Xbi currentpoint pop sub Ybi currentpoint exch pop sub rcurveto + }for dstroke}if}def +end +/ditstart{$DITroff begin + /nfonts 60 def % NFONTS makedev/ditroff dependent! + /fonts[nfonts{0}repeat]def + /fontnames[nfonts{()}repeat]def +/docsave save def +}def + +% character outcalls +/oc {/pswid exch def /cc exch def /name exch def + /ditwid pswid fontsize mul resolution mul 72000 div def + /ditsiz fontsize resolution mul 72 div def + ocprocs name known{ocprocs name get exec}{name cb} + ifelse}def +/fractm [.65 0 0 .6 0 0] def +/fraction + {/fden exch def /fnum exch def gsave /cf currentfont def + cf fractm makefont setfont 0 .3 dm 2 copy neg rmoveto + fnum show rmoveto currentfont cf setfont(\244)show setfont fden show + grestore ditwid 0 rmoveto} def +/oce {grestore ditwid 0 rmoveto}def +/dm {ditsiz mul}def +/ocprocs 50 dict def ocprocs begin +(14){(1)(4)fraction}def +(12){(1)(2)fraction}def +(34){(3)(4)fraction}def +(13){(1)(3)fraction}def +(23){(2)(3)fraction}def +(18){(1)(8)fraction}def +(38){(3)(8)fraction}def +(58){(5)(8)fraction}def +(78){(7)(8)fraction}def +(sr){gsave .05 dm .16 dm rmoveto(\326)show oce}def +(is){gsave 0 .15 dm rmoveto(\362)show oce}def +(->){gsave 0 .02 dm rmoveto(\256)show oce}def +(<-){gsave 0 .02 dm rmoveto(\254)show oce}def +(==){gsave 0 .05 dm rmoveto(\272)show oce}def +end +% DIThacks fonts for some special chars +50 dict dup begin +/FontType 3 def +/FontName /DIThacks def +/FontMatrix [.001 0.0 0.0 .001 0.0 0.0] def +/FontBBox [-220 -280 900 900] def% a lie but ... +/Encoding 256 array def +0 1 255{Encoding exch /.notdef put}for +Encoding + dup 8#040/space put %space + dup 8#110/rc put %right ceil + dup 8#111/lt put %left top curl + dup 8#112/bv put %bold vert + dup 8#113/lk put %left mid curl + dup 8#114/lb put %left bot curl + dup 8#115/rt put %right top curl + dup 8#116/rk put %right mid curl + dup 8#117/rb put %right bot curl + dup 8#120/rf put %right floor + dup 8#121/lf put %left floor + dup 8#122/lc put %left ceil + dup 8#140/sq put %square + dup 8#141/bx put %box + dup 8#142/ci put %circle + dup 8#143/br put %box rule + dup 8#144/rn put %root extender + dup 8#145/vr put %vertical rule + dup 8#146/ob put %outline bullet + dup 8#147/bu put %bullet + dup 8#150/ru put %rule + dup 8#151/ul put %underline + pop +/DITfd 100 dict def +/BuildChar{0 begin + /cc exch def /fd exch def + /charname fd /Encoding get cc get def + /charwid fd /Metrics get charname get def + /charproc fd /CharProcs get charname get def + charwid 0 fd /FontBBox get aload pop setcachedevice + 40 setlinewidth + newpath 0 0 moveto gsave charproc grestore + end}def +/BuildChar load 0 DITfd put +%/UniqueID 5 def +/CharProcs 50 dict def +CharProcs begin +/space{}def +/.notdef{}def +/ru{500 0 rls}def +/rn{0 750 moveto 500 0 rls}def +/vr{20 800 moveto 0 -770 rls}def +/bv{20 800 moveto 0 -1000 rls}def +/br{20 770 moveto 0 -1040 rls}def +/ul{0 -250 moveto 500 0 rls}def +/ob{200 250 rmoveto currentpoint newpath 200 0 360 arc closepath stroke}def +/bu{200 250 rmoveto currentpoint newpath 200 0 360 arc closepath fill}def +/sq{80 0 rmoveto currentpoint dround newpath moveto + 640 0 rlineto 0 640 rlineto -640 0 rlineto closepath stroke}def +/bx{80 0 rmoveto currentpoint dround newpath moveto + 640 0 rlineto 0 640 rlineto -640 0 rlineto closepath fill}def +/ci{355 333 rmoveto currentpoint newpath 333 0 360 arc + 50 setlinewidth stroke}def + +/lt{20 -200 moveto 0 550 rlineto currx 800 2cx s4 add exch s4 a4p stroke}def +/lb{20 800 moveto 0 -550 rlineto currx -200 2cx s4 add exch s4 a4p stroke}def +/rt{20 -200 moveto 0 550 rlineto currx 800 2cx s4 sub exch s4 a4p stroke}def +/rb{20 800 moveto 0 -500 rlineto currx -200 2cx s4 sub exch s4 a4p stroke}def +/lk{20 800 moveto 20 300 -280 300 s4 arcto pop pop 1000 sub + currentpoint stroke moveto + 20 300 4 2 roll s4 a4p 20 -200 lineto stroke}def +/rk{20 800 moveto 20 300 320 300 s4 arcto pop pop 1000 sub + currentpoint stroke moveto + 20 300 4 2 roll s4 a4p 20 -200 lineto stroke}def +/lf{20 800 moveto 0 -1000 rlineto s4 0 rls}def +/rf{20 800 moveto 0 -1000 rlineto s4 neg 0 rls}def +/lc{20 -200 moveto 0 1000 rlineto s4 0 rls}def +/rc{20 -200 moveto 0 1000 rlineto s4 neg 0 rls}def +end + +/Metrics 50 dict def Metrics begin +/.notdef 0 def +/space 500 def +/ru 500 def +/br 0 def +/lt 250 def +/lb 250 def +/rt 250 def 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V)-.15 F .025 +(irtual serv)-.6 F .025(er is a high-per)-.15 F(-)-.2 E 1.031 +(formance and highly a)108 300.8 R -.25(va)-.2 G 1.031(ilable serv).25 F +1.031(er b)-.15 F 1.031(uilt on a cluster of real serv)-.2 F 1.03 +(ers. T)-.15 F 1.23 -.1(wo m)-.8 H 1.03(ethods of).1 F(IP-le)108 312.8 Q +-.15(ve)-.25 G 3.025(ll).15 G .525(oad balancing were de)-3.025 F -.15 +(ve)-.25 G .525(loped to mak).15 F 3.025(ep)-.1 G .526 +(arallel services of the cluster to appear)-3.025 F 1.614 +(as a virtual service on a single IP address, one is virtual serv)108 +324.8 R 1.614(er via Netw)-.15 F 1.614(ork Address)-.1 F -.35(Tr)108 +336.8 S 1.017(anslation, the other is virtual serv).35 F 1.018 +(er via IP tunneling. 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Intr)72 453.8 R(oduction)-.288 E F2 +-.4(Wi)72 483.8 S .572(th the e).4 F(xplosi)-.15 E .872 -.15(ve g)-.25 H +(ro).15 E .572 +(wth of the Internet and its increasingly important role in our li)-.25 +F -.15(ve)-.25 G .571(s, the traf).15 F .571(\214c on the)-.25 F .379 +(Internet is increasing dramatically)72 495.8 R 2.879(,w)-.65 G .379 +(hich has been gro)-2.879 F .379(wing at o)-.25 F -.15(ve)-.15 G 2.879 +(r1).15 G .38(00% annual rate. The load on popular)-2.879 F .035 +(Internet sites is gro)72 507.8 R .035(wing rapidly)-.25 F 2.535(,s)-.65 +G .035(ome ha)-2.535 F .335 -.15(ve a)-.2 H .034 +(lready got tens of millions hits per day).15 F 2.534(.M)-.65 G .034 +(ore and more admin-)-2.534 F 1.792(istrators ha)72 519.8 R 2.092 -.15 +(ve m)-.2 H 1.793(et the performance bottleneck problem of their serv) +.15 F 1.793(ers, and with the increasing access)-.15 F .945 +(requests the serv)72 531.8 R .945(ers will be easily o)-.15 F -.15(ve) +-.15 G .945(rloaded for a short time. No).15 F -.1(wa)-.25 G .945 +(days, more and more companies are).1 F(mo)72 543.8 Q .73(ving their b) +-.15 F .73(usinesses on the Internet, an)-.2 F 3.231(yi)-.15 G .731 +(nterrupt/stop of services on the serv)-3.231 F .731(ers means b)-.15 F +.731(usiness lose,)-.2 F .827(and high a)72 555.8 R -.25(va)-.2 G .827 +(ilability of these serv).25 F .827 +(ers becomes increasingly important. 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The serv)-.05 F .315(er is a single) +-.15 F(point of f)72 678.2 Q(ailure. 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V)-.15 F 1.186 +(irtual serv)-.6 F 1.186(er is a scalable and highly a)-.15 F -.25(va) +-.2 G(ilable).25 E(serv)72 111.6 Q .505(er b)-.15 F .505 +(uilt on a cluster of loosely coupled independent serv)-.2 F .505 +(ers. The architecture of the cluster is transpar)-.15 F(-)-.2 E .387 +(ent to clients outside the cluster)72 123.6 R 2.887(.C)-.55 G .387(lie\ +nt applications interact with the cluster as if it were a single high-p\ +er)-2.887 F(-)-.2 E .272(formance and highly a)72 135.6 R -.25(va)-.2 G +.271(ilable serv).25 F(er)-.15 E 2.771(.T)-.55 G .271 +(he clients are not af)-2.771 F .271 +(fected by interaction with the cluster and do not)-.25 F +(need modi\214cation. 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+ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffff +showpage +end +%%EOF +%%EndDocument +end PEND(Figure 1. generic architecture of a virtual serv)192.55 498.101 +Q(er)-.15 E 1.397(The real serv)72 519.701 R 1.398(ers may be interconn\ +ected by high-speed LAN or by geographically dispersed W)-.15 F 3.898 +(AN. The)-1.2 F .579(front-end of the real serv)72 531.701 R .579 +(ers is a load balancer)-.15 F 3.079(,w)-.4 G .579 +(hich schedules requests to the dif)-3.079 F .578(ferent serv)-.25 F +.578(ers and mak)-.15 F(e)-.1 E .509(parallel services of the cluster t\ +o appear as a virtual service on a single IP address.)72 543.701 R .509 +(Scalability is achie)5.509 F -.15(ve)-.25 G(d).15 E .002 +(by transparently adding or remo)72 555.701 R .001 +(ving a node in the cluster)-.15 F 2.501(.H)-.55 G .001(igh a)-2.501 F +-.25(va)-.2 G .001(ilability is pro).25 F .001 +(vided by detecting node or)-.15 F(daemon f)72 567.701 Q +(ailures and recon\214guring the system appropriately)-.1 E(.)-.65 E +.023(The remainder of the paper is or)72 583.301 R -.05(ga)-.18 G .023 +(nized as follo).05 F .023(ws: In Section 2, we discuss the related w) +-.25 F .024(orks. In Section 3,)-.1 F .24 +(we describe the architectures and w)72 595.301 R .24 +(orking principles of virtual serv)-.1 F .24(er via Netw)-.15 F .24 +(ork Address T)-.1 F .24(ranslation and)-.35 F 2.032(virtual serv)72 +607.301 R 2.032(er via IP tunneling, and also discuss their adv)-.15 F +2.033(antages and disadv)-.25 F 2.033(antages. In Section 4, we)-.25 F +.325(describe the four scheduling algorithms that ha)72 619.301 R .625 +-.15(ve b)-.2 H .325(een de).15 F -.15(ve)-.25 G .325 +(loped for Linux virtual serv).15 F(er)-.15 E 2.825(.I)-.55 G 2.825(nS) +-2.825 G .325(ection 5, we)-2.825 F .375(describe the high a)72 631.301 +R -.25(va)-.2 G .375(ilability issues for Linux virtual serv).25 F(er) +-.15 E 5.375(.F)-.55 G(inally)-5.375 E 2.875(,c)-.65 G .376 +(onclusion and future w)-2.875 F .376(ork appear in)-.1 F(Section 6.)72 +643.301 Q EP +%%Page: 3 3 +%%BeginPageSetup +BP +%%EndPageSetup +/F0 10/Times-Roman@0 SF(-3-)282.17 48 Q/F1 16/Times-Bold@0 SF 4 +(2. Related)72 84 R -1.2(Wo)4 G(rks)1.2 E F0 .376(In the client/serv)72 +114 R .376 +(er applications, one end is the client, the other end is the serv)-.15 +F(er)-.15 E 2.875(,a)-.4 G .375(nd there may be a proxy)-2.875 F .988 +(in the middle, such as a proxy serv)72 126 R .988 +(er for web services. Based on this scenario, we can see that there are) +-.15 F(man)72 138 Q 2.812(yw)-.15 G .311 +(ays to dispatch requests to a cluster of serv)-2.912 F .311 +(ers in the dif)-.15 F .311(ferent le)-.25 F -.15(ve)-.25 G 2.811 +(ls. In).15 F .311(general, these serv)2.811 F .311(ers ha)-.15 F -.15 +(ve)-.2 G .125(the same service and the same set of contents. The conte\ +nts are either replicated on each serv)72 150 R(er')-.15 E 2.626(sl)-.55 +G .126(ocal disk,)-2.626 F .87(shared on a netw)72 162 R .87 +(ork \214lesystem, or serv)-.1 F .87(ed by a distrib)-.15 F .87 +(uted \214le system.)-.2 F .87(Existing request dispatching tech-)5.87 F +(niques can be classi\214ed into the follo)72 174 Q(wing cate)-.25 E +(gories:)-.15 E<83>72 189.6 Q/F2 10/Times-Bold@0 SF +(The client-side appr)6.5 E(oach)-.18 E F0(Berk)82 205.2 Q(ele)-.1 E(y') +-.15 E 2.66(sS)-.55 G .16(mart Client)-2.66 F/F3 7/Times-Roman@0 SF(1) +-4.1 I F0 .16(suggests that the service pro)2.66 4.1 N .16 +(vide an applet running at the client side. The applet)-.15 F(mak)82 +217.2 Q 1.453(es requests to the cluster of serv)-.1 F 1.453 +(ers to collect load information of all the serv)-.15 F 1.453 +(ers, then chooses a)-.15 F(serv)82 229.2 Q .061 +(er based on that information and forw)-.15 F .061 +(ards requests to that serv)-.1 F(er)-.15 E 5.061(.T)-.55 G .062 +(he applet tries other serv)-5.061 F .062(ers when)-.15 F 1.168 +(it \214nds the chosen serv)82 241.2 R 1.168(er is do)-.15 F 3.668 +(wn. Boston)-.25 F(Uni)3.668 E -.15(ve)-.25 G 1.168(rsity de).15 F -.15 +(ve)-.25 G 1.167(loped dynamic serv).15 F 1.167(er selection techniques) +-.15 F F3(2)-4.1 I F0 1.198(using bandwidth probing on the client side,\ + in which the maximum possible bandwidth along a gi)82 253.2 R -.15(ve) +-.25 G(n).15 E .859(path and the current congestion along a path are es\ +timated through probing. Ho)82 265.2 R(we)-.25 E -.15(ve)-.25 G 1.658 +-.4(r, t).15 H .858(hese client-side).4 F .29 +(approaches are not client-transparent, the)82 277.2 R 2.79(yr)-.15 G +.29(equires modi\214cation of client applications, so the)-2.79 F 2.79 +(yc)-.15 G .29(annot be)-2.79 F .284 +(applied to all TCP/IP services. Moreo)82 289.2 R -.15(ve)-.15 G 1.084 +-.4(r, t).15 H(he).4 E 2.784(yw)-.15 G .283 +(ill potentially increase netw)-2.784 F .283(ork traf)-.1 F .283 +(\214c by e)-.25 F .283(xtra querying)-.15 F(or probing.)82 301.2 Q<83> +72 316.8 Q F2(The ser)6.5 E -.1(ve)-.1 G -.37(r-).1 G +(side Round-Robin DNS appr).37 E(oach)-.18 E F0 1.15 +(The NCSA scalable web serv)82 332.4 R 1.151 +(er is the \214rst prototype of a scalable web serv)-.15 F 1.151 +(er by using of the Round-)-.15 F 1.279(Robin DNS approach.)82 344.4 R +F3 1.279(3, 4, 5)-4.1 J F0 1.279(The RRDNS serv)3.779 4.1 N 1.279 +(er maps a single name to the dif)-.15 F 1.279(ferent IP addresses in a) +-.25 F 1.352(round-robin manner so that the dif)82 356.4 R 1.352 +(ferent clients will access the dif)-.25 F 1.352(ferent serv)-.25 F +1.352(ers in the cluster for the)-.15 F .265(ideal situation. In this w) +82 368.4 R(ay)-.1 E 2.764(,t)-.65 G .264(he load is distrib)-2.764 F +.264(uted among the serv)-.2 F .264(ers. Ho)-.15 F(we)-.25 E -.15(ve) +-.25 G 1.064 -.4(r, d).15 H .264(ue to the caching nature).4 F 1.203(of\ + clients and hierarchical DNS system, it easily leads to dynamic load i\ +mbalance among the serv)82 380.4 R(ers,)-.15 E .324 +(thus it is not easy for a serv)82 392.4 R .324 +(er to handle its peak load. The TTL\(T)-.15 F .324(ime T)-.35 F 2.824 +(oL)-.8 G -2.15 -.25(iv e)-2.824 H 2.824(\)v).25 G .323 +(alue of a name mapping)-3.074 F .869 +(cannot be well chosen at RR-DNS, with small v)82 404.4 R .87 +(alues the RR-DNS will be a bottleneck, and with high)-.25 F -.25(va)82 +416.4 S .025(lues the dynamic load imbalance will get e).25 F -.15(ve) +-.25 G 2.525(nw).15 G .025(orse. Ev)-2.625 F .025(en the TTL v)-.15 F +.025(alue is set with zero, the schedul-)-.25 F 2.508 +(ing granularity is host-based, dif)82 428.4 R 2.509 +(ferent users' access pattern may lead to dynamic load imbalance,)-.25 F +.686(because some people may pull lots of pages from the site, and othe\ +rs may just surf a fe)82 440.4 R 3.185(wp)-.25 G .685(ages and go)-3.185 +F -2.3 -.15(aw a)82 452.4 T 1.94 -.65(y. M).15 H(oreo).65 E -.15(ve)-.15 +G 1.44 -.4(r, i).15 H 3.14(ti).4 G 3.14(sn)-3.14 G .64 +(ot so reliable, when a serv)-3.14 F .64(er node f)-.15 F .641 +(ails, the clients who maps the name to the IP)-.1 F .612 +(address will \214nd the serv)82 464.4 R .612(er is do)-.15 F .612 +(wn, and the problem still e)-.25 F .612(xists e)-.15 F -.15(ve)-.25 G +3.111(ni).15 G 3.111(ft)-3.111 G(he)-3.111 E 3.111(yp)-.15 G .611 +(ress "reload" or "refresh")-3.111 F -.2(bu)82 476.4 S +(tton in their bro).2 E(wsers.)-.25 E<83>72 492 Q F2(The ser)6.5 E -.1 +(ve)-.1 G -.37(r-).1 G(side application-le).37 E -.1(ve)-.15 G 2.5(ls).1 +G(cheduling appr)-2.5 E(oach)-.18 E F0(EDDIE)82 507.6 Q F3(6)-4.1 I F0 +2.87(,R)2.87 4.1 O -2.15 -.25(ev e)-2.87 H(rse-proxy).25 E F3(7)-4.1 I +F0 2.87(,p)2.87 4.1 O(WEB)-2.87 E F3(8)-4.1 I F0 .37(and SWEB)2.87 4.1 N +F3(9)-4.1 I F0 .37(use the application-le)2.87 4.1 N -.15(ve)-.25 G 2.87 +(ls).15 G .37(cheduling approach to b)-2.87 F .37(uild a)-.2 F .44 +(scalable web serv)82 519.6 R(er)-.15 E 2.94(.T)-.55 G(he)-2.94 E 2.94 +(ya)-.15 G .44(ll forw)-2.94 F .439(ard the HTTP requests to the dif)-.1 +F .439(ferent web serv)-.25 F .439(ers in the cluster)-.15 F 2.939(,t) +-.4 G(hen)-2.939 E .929 +(get the results, and \214nally return them to the clients.)82 531.6 R +(Ho)5.929 E(we)-.25 E -.15(ve)-.25 G 1.73 -.4(r, t).15 H .93 +(his approach requires to establish tw).4 F(o)-.1 E .621(TCP connection\ +s for each request, one is between the client and the load balancer)82 +543.6 R 3.12(,t)-.4 G .62(he other is between)-3.12 F .518 +(the load balancer and the serv)82 555.6 R(er)-.15 E 3.018(,t)-.4 G .518 +(he delay is high. And, the o)-3.018 F -.15(ve)-.15 G .519 +(rhead of dealing the HTTP requests and).15 F .143 +(replies in the application-le)82 567.6 R -.15(ve)-.25 G 2.643(li).15 G +2.643(sh)-2.643 G .143(igh too, so the application-le)-2.643 F -.15(ve) +-.25 G 2.642(ll).15 G .142(oad balancer will be a ne)-2.642 F 2.642(wb) +-.25 G(ottleneck)-2.642 E(soon when the number of serv)82 579.6 Q +(er nodes increases.)-.15 E<83>72 595.2 Q F2(The ser)6.5 E -.1(ve)-.1 G +-.37(r-).1 G(side IP-le).37 E -.1(ve)-.15 G 2.5(ls).1 G(cheduling appr) +-2.5 E(oaches)-.18 E F0(Berk)82 610.8 Q(ele)-.1 E(y')-.15 E 2.717(sM) +-.55 G(agicRouter)-2.717 E F3(10)-4.1 I F0 .217(and Cisco')2.717 4.1 N +2.717(sL)-.55 G(ocalDirector)-2.717 E F3(11)-4.1 I F0 .217(use the Netw) +2.717 4.1 N .217(ork Address T)-.1 F .218(ranslation approach to)-.35 F +(mak)82 622.8 Q 3.309(ep)-.1 G .809(arallel service on dif)-3.309 F .809 +(ferent serv)-.25 F .809 +(er to appear as a virtual service on a single IP address. The load)-.15 +F 1.573(balancer changes the destination address of the request pack)82 +634.8 R 1.574(ets and forw)-.1 F 1.574(ards the chosen serv)-.1 F(er) +-.15 E 4.074(,t)-.4 G(hen)-4.074 E 1.346 +(change the source address of the reply pack)82 646.8 R 1.346 +(ets back to the original destination address. Ho)-.1 F(we)-.25 E -.15 +(ve)-.25 G 2.146 -.4(r, t).15 H(he).4 E .972(MagicRouter doesn')82 658.8 +R 3.472(ts)-.18 G(urvi)-3.472 E 1.272 -.15(ve t)-.25 H 3.472(ob).15 G +-5.971 3.472(ea u)-3.472 H .973 +(seful system for other users, the LocalDirector is too e)-3.472 F +(xpensi)-.15 E -.15(ve)-.25 G(,).15 E .959(and the)82 670.8 R 3.459(yo) +-.15 G .959(nly support part of TCP protocol. This approach w)-3.459 F +.958(as well implemented in the Linux virtual)-.1 F(serv)82 682.8 Q(er) +-.15 E 2.5(,a)-.4 G(nd it will be discussed in detail in the follo)-2.5 +E(wing sections.)-.25 E(IBM')82 698.4 Q 4.284(sT)-.55 G 1.784(CP router) +-4.284 F F3(12)-4.1 I F0 1.784(uses the modi\214ed Netw)4.284 4.1 N +1.785(ork Address T)-.1 F 1.785(ranslation approach to b)-.35 F 1.785 +(uild scalable web)-.2 F(serv)82 710.4 Q 1.324(er on IBM scalable P)-.15 +F 1.324(arallel SP-2 system.)-.15 F 1.324 +(The TCP router changes the destination address of the)6.324 F 1.28 +(request pack)82 722.4 R 1.28(ets and forw)-.1 F 1.28 +(ards the chosen serv)-.1 F(er)-.15 E 3.78(,t)-.4 G 1.28(hat serv)-3.78 +F 1.28(er is modi\214ed to put the TCP router address)-.15 F EP +%%Page: 4 4 +%%BeginPageSetup +BP +%%EndPageSetup +/F0 10/Times-Roman@0 SF(-4-)282.17 48 Q 1.465(instead of its o)82 84 R +1.465(wn address as the source address in the reply pack)-.25 F 1.464 +(ets. The adv)-.1 F 1.464(antage of the modi\214ed)-.25 F .441 +(approach is that the TCP router a)82 96 R -.2(vo)-.2 G .442(ids re).2 F +.442(writing of the reply pack)-.25 F .442(ets, the disadv)-.1 F .442 +(antage is that it requires)-.25 F(modi\214cation of the k)82 108 Q +(ernel code of e)-.1 E -.15(ve)-.25 G(ry serv).15 E(er in the cluster) +-.15 E(.)-.55 E(ONE-IP)82 123.6 Q/F1 7/Times-Roman@0 SF(13)-4.1 I F0 .12 +(is another IP-le)2.62 4.1 N -.15(ve)-.25 G 2.62(ls).15 G .12 +(cheduling approach. It requires that all serv)-2.62 F .12(ers ha)-.15 F +.42 -.15(ve t)-.2 H .12(heir o).15 F .12(wn IP addresses)-.25 F 1.081 +(in a netw)82 135.6 R 1.081(ork and the)-.1 F 3.581(ya)-.15 G 1.082 +(re all con\214gured with the same IP address on the IP alias interf) +-3.581 F 1.082(aces. T)-.1 F 1.282 -.1(wo d)-.8 H(is-).1 E .301(patchin\ +g techniques are used, one is based on a central dispatcher routing IP \ +pack)82 147.6 R .301(ets to dif)-.1 F .301(ferent serv)-.25 F(ers,)-.15 +E .908(the other is based on pack)82 159.6 R .909 +(et broadcasting and local \214ltering. The adv)-.1 F .909 +(antage is that the re)-.25 F .909(writing of the)-.25 F 1.445 +(reply pack)82 171.6 R 1.445(ets can be a)-.1 F -.2(vo)-.2 G 1.445 +(ided. The disadv).2 F 1.444 +(antage is it can be applied to all operating systems because)-.25 F +1.431(some operating systems will shutdo)82 183.6 R 1.431(wn the netw) +-.25 F 1.432(ork interf)-.1 F 1.432 +(ace when detecting IP address collision, the)-.1 F +(local \214ltering also requires the modi\214cation of the k)82 195.6 Q +(ernel code of e)-.1 E -.15(ve)-.25 G(ry serv).15 E(er)-.15 E(.)-.55 E +/F2 16/Times-Bold@0 SF 4(3. V)72 228.6 R(irtual Ser)-.592 E -.16(ve)-.16 +G 4(rA).16 G -.288(rc)-4 G(hitectur).288 E(es)-.288 E F0 .167 +(Linux virtual serv)72 258.6 R(er)-.15 E F1(14)-4.1 I F0 .167(is no) +2.667 4.1 N 2.666(wi)-.25 G .166(mplemented in tw)-2.666 F 2.666(ow)-.1 +G .166(ays. One is virtual serv)-2.766 F .166(er via Netw)-.15 F .166 +(ork Address T)-.1 F(ransla-)-.35 E .132 +(tion; the other is virtual serv)72 270.6 R .132 +(er via IP tunneling. The follo)-.15 F .133(wing tw)-.25 F 2.633(os)-.1 +G .133(ubsections e)-2.633 F .133(xplain their dif)-.15 F .133 +(ferent archi-)-.25 F .38(tectures and w)72 282.6 R .38 +(orking principles respecti)-.1 F -.15(ve)-.25 G(ly).15 E 2.88(.T)-.65 G +.38(he third subsection discusses their adv)-2.88 F .38 +(antages and disadv)-.25 F(an-)-.25 E .404(tages. The virtual serv)72 +294.6 R .404(er code is no)-.15 F 2.904(wd)-.25 G -2.15 -.25(ev e)-2.904 +H .404(loped based on Linux IP Masquerading code in the Linux k).25 F +(ernel)-.1 E .63(2.0, and some of Ste)72 306.6 R -.15(ve)-.25 G 3.13(nC) +.15 G(lark)-3.13 E(e')-.1 E 3.13(sp)-.55 G .63(ort forw)-3.13 F .63 +(arding code is reused. It supports both TCP and UDP services,)-.1 F +1.441(such as HTTP)72 318.6 R 3.941(,P)-1.11 G(roxy)-3.941 E 3.941(,D) +-.65 G 1.441(NS and so on. F)-3.941 F 1.441 +(or protocols that transmit IP addresses and/or port numbers as)-.15 F +.736(application data, additional code is need to handle it. Currently \ +FTP w)72 330.6 R .736(as supported, others require adding)-.1 F(ne)72 +342.6 Q 2.5(wh)-.25 G(andling code.)-2.5 E/F3 15/Times-Bold@0 SF 3.75 +(3.1. V)72 372.6 R(irtual Ser)-.555 E -.15(ve)-.15 G 3.75(rv).15 G(ia N) +-3.75 E -1.425(AT)-.3 G F0 .565(Due to the shortage of IP address in IP\ +v4 and some security reasons, more and more netw)72 395.4 R .566 +(orks use pri)-.1 F -.25(va)-.25 G(te).25 E .724 +(IP addresses which cannot be used outside the netw)72 407.4 R .723 +(ork \(or in the Internet\). The need for netw)-.1 F .723(ork address) +-.1 F .354(translation arises when hosts in internal netw)72 419.4 R +.354(orks w)-.1 F .355 +(ant to access the Internet or to be accessed in the Inter)-.1 F(-)-.2 E +1.064(net. Netw)72 431.4 R 1.064 +(ork address translation relies on the f)-.1 F 1.064 +(act that the headers for Internet protocols can be adjusted)-.1 F .255 +(appropriately so that clients belie)72 443.4 R .555 -.15(ve t)-.25 H +(he).15 E 2.755(ya)-.15 G .255(re contacting one IP address, b)-2.755 F +.255(ut serv)-.2 F .255(ers at dif)-.15 F .255(ferent IP addresses)-.25 +F(belie)72 455.4 Q .519 -.15(ve t)-.25 H(he).15 E 2.719(ya)-.15 G .219 +(re contacted directly by the clients.)-2.719 F .219 +(This feature can be used to b)5.219 F .219(uild a virtual serv)-.2 F +(er)-.15 E 2.719(,i)-.4 G .218(.e. par)-2.719 F(-)-.2 E +(allel services at the dif)72 467.4 Q(ferent IP addresses can appear as\ + a virtual service on a single IP address via N)-.25 E -1.02 -1.11(AT .) +-.35 H .539(The architecture of virtual serv)72 495 R .539(er via N)-.15 +F 2.759 -1.11(AT i)-.35 H 3.039(si)1.11 G .54 +(llustrated in Figure 2. The load balancer and real serv)-3.039 F .54 +(ers are)-.15 F .547(interconnected by a switch or a hub)72 507 R 3.046 +(.T)-.4 G .546(he real serv)-3.046 F .546 +(ers usually run the same service and the)-.15 F 3.046(yh)-.15 G -2.25 +-.2(av e)-3.046 H .546(the same)3.246 F .644 +(set of contents. The contents are either replicated on each serv)72 519 +R(er')-.15 E 3.145(sl)-.55 G .645(ocal disk, shared on a netw)-3.145 F +.645(ork \214lesys-)-.1 F .444(tem, or serv)72 531 R .444 +(ed by a distrib)-.15 F .444(uted \214le system \(such as AFS or COD)-.2 +F .443(A\). 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+ffffffffffffffffffffffffffffffffffffffffffffffffff +showpage +end +%%EOF +%%EndDocument +end PEND(Figure 2: Architecture of a virtual serv)188.83 437.764 Q +(er via N)-.15 E -1.11(AT)-.35 G 1.05(The w)72 459.364 R(ork\215o)-.1 E +3.55(wo)-.25 G 3.55(fv)-3.55 G 1.05(irtual serv)-3.55 F 1.05(er via N) +-.15 F 3.27 -1.11(AT i)-.35 H 3.55(sa)1.11 G 3.55(sf)-3.55 G(ollo)-3.55 +E 1.05(ws: When a user accesses the service pro)-.25 F 1.05 +(vided by the)-.15 F(serv)72 471.364 Q .956(er cluster)-.15 F 3.456(,t) +-.4 G .956(he request pack)-3.456 F .955 +(et destined for virtual IP address \(the e)-.1 F .955 +(xternal IP address for the load bal-)-.15 F 1.11(ancer\) arri)72 +483.364 R -.15(ve)-.25 G 3.61(sa).15 G 3.61(tt)-3.61 G 1.11 +(he load balancer)-3.61 F 3.61(.T)-.55 G 1.11(he load balancer e)-3.61 F +1.11(xamines the pack)-.15 F(et')-.1 E 3.61(sd)-.55 G 1.11 +(estination address and port)-3.61 F(number)72 495.364 Q 3.785(.I)-.55 G +3.785(ft)-3.785 G(he)-3.785 E 3.785(ya)-.15 G 1.285 +(re matched for a virtual serv)-3.785 F 1.285 +(er service according to the virtual serv)-.15 F 1.285 +(er rule table, a real)-.15 F(serv)72 507.364 Q .231(er is chosen from \ +the cluster by a scheduling algorithm, and the connection is added into\ + the hash table)-.15 F 1.683(which records all established connections.\ + Then, the destination address and the port of the pack)72 519.364 R +1.682(et are)-.1 F(re)72 531.364 Q .062 +(written to those of the chosen serv)-.25 F(er)-.15 E 2.563(,a)-.4 G +.063(nd the pack)-2.563 F .063(et is forw)-.1 F .063(arded to the serv) +-.1 F(er)-.15 E 2.563(.W)-.55 G .063(hen the incoming pack)-2.563 F(et) +-.1 E .259(belongs to this connection and the established connection ca\ +n be found in the hash table, the pack)72 543.364 R .258(et will be)-.1 +F(re)72 555.364 Q .116(written and forw)-.25 F .117 +(arded to the chosen serv)-.1 F(er)-.15 E 2.617(.W)-.55 G .117 +(hen the reply pack)-2.617 F .117(ets come back, the load balancer re) +-.1 F(writes)-.25 E .076(the source address and port of the pack)72 +567.364 R .075 +(ets to those of the virtual service. When the connection terminates or) +-.1 F(timeouts, the connection record will be remo)72 579.364 Q -.15(ve) +-.15 G 2.5(di).15 G 2.5(nt)-2.5 G(he hash table.)-2.5 E(An e)72 594.964 +Q(xample of V)-.15 E(irtual Serv)-.6 E(er via N)-.15 E 2.22 -1.11(AT i) +-.35 H 2.5(si)1.11 G(llustrated in Figure 3.)-2.5 E EP +%%Page: 6 6 +%%BeginPageSetup +BP +%%EndPageSetup +/F0 10/Times-Roman@0 SF(-6-)282.17 48 Q 14 14 244.8 665 -209.092 568 +165.6 293.092 PBEGIN +%%BeginDocument: figure3.ps +%%Creator: GIMP PostScript file plugin V 1.04 by Peter Kirchgessner +%%Title: /home/wensong/linuxexpo/figure3.ps +%%CreationDate: Thu Mar 4 20:28:54 1999 +%%DocumentData: Clean7Bit +%%Pages: 1 +%%BoundingBox: 14 14 679 582 +%%EndComments +%%BeginProlog +% Use own dictionary to avoid conflicts +5 dict begin +% Translate for offset +14.173228 14.173228 translate +% Translate to begin of first scanline +0.000000 566.929134 translate +664.263353 -566.929134 scale +% Variable to keep one line of raster data 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speci\214ed in the Linux box with virtual serv).8 E +(er support.)-.15 E .4 LW 503.989 343.192 72 343.192 DL/F1 10 +/Times-Bold@0 SF -.92(Ta)197.869 352.692 S +(ble 1: an example of virtual ser).92 E -.1(ve)-.1 G 2.5(rr).1 G(ules) +-2.5 E 503.989 357.192 72 357.192 DL F0 31.631(Protocol V)83.377 366.692 +R(irtual IP Address)-.6 E 31.631(Port Real)34.131 F(IP Address)2.5 E +34.961(Port W)34.131 F(eight)-.8 E 503.989 371.192 72 371.192 DL 54.121 +(172.16.0.2 80)310.72 380.692 R(1)44.131 E 503.989 385.192 293.654 +385.192 DL 54.121(172.16.0.3 8000)310.72 394.692 R(2)34.131 E 47.181 +(TCP 202.103.106.5)83.377 387.692 R(80)51.021 E 503.989 399.192 72 +399.192 DL 47.181(TCP 202.103.106.5)83.377 408.692 R 38.301 +(21 172.16.0.3)51.021 F 41.631(21 1)56.621 F 503.989 413.192 72 413.192 +DL 503.989 343.192 503.989 413.192 DL 72 343.192 72 413.192 DL 446.906 +357.192 446.906 413.192 DL 392.775 357.192 392.775 413.192 DL 293.654 +357.192 293.654 413.192 DL 242.853 357.192 242.853 413.192 DL 134.332 +357.192 134.332 413.192 DL .896(All traf)72 430.292 R .897 +(\214c destined for IP address 202.103.106.5 Port 80 is load-balanced o) +-.25 F -.15(ve)-.15 G 3.397(rr).15 G .897(eal IP address 172.16.0.2) +-3.397 F .665(Port 80 and 172.16.0.3 Port 8000. T)72 442.292 R(raf)-.35 +E .664(\214c destined for IP address 202.103.106.5 Port 21 is port-forw) +-.25 F(arded)-.1 E .923 +(to real IP address 172.16.0.3 Port 21. Note real serv)72 454.292 R .923 +(ers can run an)-.15 F 3.424(yO)-.15 G 3.424(St)-3.424 G .924 +(hat supports TCP/IP)-3.424 F 3.424(,t)-1.11 G .924(he def)-3.424 F +(ault)-.1 E(route of real serv)72 466.292 Q +(ers must be the virtual serv)-.15 E(er\(172.16.0.1 in this e)-.15 E +(xample\).)-.15 E -.15(Pa)72 481.892 S(ck).15 E(et re)-.1 E(writing w) +-.25 E(orks as follo)-.1 E(ws.)-.25 E(The incoming pack)97 497.492 Q +(et for web service w)-.1 E +(ould has source and destination addresses as:)-.1 E 503.992 507.992 97 +507.992 DL 52.586(SOURCE 202.100.1.2:3456 DEST 202.103.106.5:80)115.362 +517.492 R 503.992 521.992 97 521.992 DL 503.992 507.992 503.992 521.992 +DL 97 507.992 97 521.992 DL 387.807 507.992 387.807 521.992 DL 307.721 +507.992 307.721 521.992 DL 182.355 507.992 182.355 521.992 DL .355 +(The load balancer will choose a real serv)97 535.492 R(er)-.15 E 2.855 +(,e)-.4 G .355(.g. 172.16.0.3:8000. The pack)-2.855 F .354(et w)-.1 F +.354(ould be re)-.1 F .354(written and)-.25 F(forw)97 547.492 Q +(arded to the serv)-.1 E(er as:)-.15 E 503.997 557.992 97 557.992 DL +53.951(SOURCE 202.100.1.2:3456 DEST 172.16.0.3:8000)115.817 567.492 R +503.997 571.992 97 571.992 DL 503.997 557.992 503.997 571.992 DL 97 +557.992 97 571.992 DL 391.674 557.992 391.674 571.992 DL 310.223 557.992 +310.223 571.992 DL 183.492 557.992 183.492 571.992 DL +(Replies get back to the load balancer as:)97 585.492 Q 503.997 595.992 +97 595.992 DL 53.951(SOURCE 172.16.0.3:8000 DEST 202.100.1.2:3456) +115.817 605.492 R 503.997 609.992 97 609.992 DL 503.997 595.992 503.997 +609.992 DL 97 595.992 97 609.992 DL 386.674 595.992 386.674 609.992 DL +305.223 595.992 305.223 609.992 DL 183.492 595.992 183.492 609.992 DL +(The pack)97 623.492 Q(ets w)-.1 E +(ould be written back to the virtual serv)-.1 E +(er address and returned to the client as:)-.15 E 503.992 633.992 97 +633.992 DL 52.586(SOURCE 202.103.106.5:80 DEST 202.100.1.2:3456)115.362 +643.492 R 503.992 647.992 97 647.992 DL 503.992 633.992 503.992 647.992 +DL 97 633.992 97 647.992 DL 387.807 633.992 387.807 647.992 DL 307.721 +633.992 307.721 647.992 DL 182.355 633.992 182.355 647.992 DL EP +%%Page: 7 7 +%%BeginPageSetup +BP +%%EndPageSetup +/F0 10/Times-Roman@0 SF(-7-)282.17 48 Q/F1 15/Times-Bold@0 SF 3.75 +(3.2. V)72 84 R(irtual Ser)-.555 E -.15(ve)-.15 G 3.75(rv).15 G(ia IP T) +-3.75 E(unneling)-1.38 E F0 1.913(IP tunneling \(IP encapsulation\) is \ +a technique to encapsulate IP datagram within IP datagrams, which)72 +106.8 R(allo)72 118.8 Q .073(ws datagrams destined for one IP address t\ +o be wrapped and redirected to another IP address. This tech-)-.25 F +.155(nique can be used to implement virtual serv)72 130.8 R .155 +(er that the load balancer tunnel the request pack)-.15 F .155 +(ets to the dif)-.1 F(fer)-.25 E(-)-.2 E .915(ent serv)72 142.8 R .915 +(ers, the serv)-.15 F .915 +(ers process the requests and return the results to clients directly) +-.15 F 3.414(,a)-.65 G .914(nd the services can)-3.414 F +(still appear as a virtual service on a single IP address.)72 154.8 Q +.348(The architecture of virtual serv)72 170.4 R .348 +(er via IP tunneling is illustrated in Figure 4. The most dif)-.15 F +.349(ferent thing of vir)-.25 F(-)-.2 E .414(tual serv)72 182.4 R .414 +(er via IP tunneling to that of virtual serv)-.15 F .414(er via N)-.15 F +2.634 -1.11(AT i)-.35 H 2.914(st)1.11 G .414 +(hat the load balancer sends requests to real)-2.914 F(serv)72 194.4 Q +1.314(ers through IP tunnel in the former)-.15 F 3.814(,a)-.4 G 1.314 +(nd the load balancer sends request to real serv)-3.814 F 1.315 +(ers via netw)-.15 F(ork)-.1 E(address translation in the latter)72 +206.4 Q(.)-.55 E 14 14 360 595 -343.664 568 108 562.064 PBEGIN +%%BeginDocument: figure4.ps +%%Creator: GIMP PostScript file plugin V 1.04 by Peter Kirchgessner +%%Title: /home/wensong/linuxexpo/figure4.ps +%%CreationDate: Thu Mar 4 20:29:51 1999 +%%DocumentData: Clean7Bit +%%Pages: 1 +%%BoundingBox: 14 14 609 582 +%%EndComments +%%BeginProlog +% Use own dictionary to avoid conflicts +5 dict begin +% Translate for offset +14.173228 14.173228 translate +% Translate to begin of first scanline +0.000000 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+ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffff +showpage +end +%%EOF +%%EndDocument +end PEND(Figure 4: Architecture of a virtual serv)173.79 580.064 Q +(er via IP tunneling)-.15 E .197(The w)72 601.664 R(ork\215o)-.1 E 2.697 +(wo)-.25 G 2.697(fv)-2.697 G .197(irtual serv)-2.697 F .197 +(er via IP tunneling is as follo)-.15 F .196 +(ws: When a user accesses the service pro)-.25 F .196(vided by)-.15 F +.823(the serv)72 613.664 R .823(er cluster)-.15 F 3.323(,t)-.4 G .823 +(he pack)-3.323 F .824(et destined for virtual IP address \(the IP addr\ +ess for the load balancer\) arri)-.1 F -.15(ve)-.25 G(s.).15 E 1.494 +(The load balancer e)72 625.664 R 1.493(xamines the pack)-.15 F(et')-.1 +E 3.993(sd)-.55 G 1.493(estination address and port. If the)-3.993 F +3.993(ya)-.15 G 1.493(re matched for a virtual)-3.993 F(serv)72 637.664 +Q 1.268(er service, a real serv)-.15 F 1.268(er is chosen from the clus\ +ter by a scheduling algorithm, and the connection is)-.15 F .084(added \ +into the hash table which record all established connections. Then, the\ + load balancer encapsulates the)72 649.664 R(pack)72 661.664 Q .834 +(et within an IP datagram and forw)-.1 F .835 +(ards it to the chosen serv)-.1 F(er)-.15 E 3.335(.W)-.55 G .835 +(hen the incoming pack)-3.335 F .835(et belongs to)-.1 F .365 +(this connection and the chosen serv)72 673.664 R .364 +(er can be found in the hash table, the pack)-.15 F .364(et will be ag) +-.1 F .364(ain encapsulated)-.05 F .894(and forw)72 685.664 R .894 +(arded to the serv)-.1 F(er)-.15 E 3.394(.W)-.55 G .894(hen the serv) +-3.394 F .894(er recei)-.15 F -.15(ve)-.25 G 3.394(st).15 G .894 +(he encapsulated pack)-3.394 F .894(et, it decapsulates the pack)-.1 F +(et)-.1 E .553(and processes the request, \214nally returns the result \ +to the user directly)72 697.664 R 3.052(.W)-.65 G .552 +(hen the connection terminates or)-3.052 F +(timeouts, the connection record will be remo)72 709.664 Q -.15(ve)-.15 +G 2.5(df).15 G(rom the hash table.)-2.5 E EP +%%Page: 8 8 +%%BeginPageSetup +BP +%%EndPageSetup +/F0 10/Times-Roman@0 SF(-8-)282.17 48 Q .54(Note that real serv)72 84 R +.54(ers can ha)-.15 F .84 -.15(ve a)-.2 H .84 -.15(ny r).15 H .541 +(eal IP address in an).15 F 3.041(yn)-.15 G(etw)-3.041 E .541(ork, the) +-.1 F 3.041(yc)-.15 G .541(an be geographically distrib)-3.041 F(uted,) +-.2 E -.2(bu)72 96 S 3.565(tt).2 G(he)-3.565 E 3.565(ym)-.15 G 1.065 +(ust support IP encapsulation protocol and the)-3.565 F 3.565(ya)-.15 G +1.065(ll ha)-3.565 F 1.365 -.15(ve o)-.2 H 1.065(ne of their tunnel de) +.15 F 1.065(vices con\214gured)-.25 F 1.159(with <V)72 108 R 1.159 +(irtual IP Address>, lik)-.6 F 3.659(e")-.1 G 1.159(ifcon\214g tunl0 <V) +-3.659 F 1.159(irtual IP Address>" in Linux.)-.6 F 1.16 +(When the encapsulated)6.16 F(pack)72 120 Q .275(et arri)-.1 F -.15(ve) +-.25 G .274(s, the real serv).15 F .274 +(er decapsulates it and \214nds that the pack)-.15 F .274 +(et is destined for <V)-.1 F .274(irtual IP Address>,)-.6 F(so it proce\ +sses the request and returns the result directly to the user in the end\ +.)72 132 Q/F1 15/Times-Bold@0 SF 3.75(3.3. Adv)72 162 R +(antages and Disadv)-.15 E(antages)-.15 E/F2 14/Times-Bold@0 SF 3.5 +(3.3.1. V)72 192 R(irtual ser)-.518 E -.14(ve)-.14 G 3.5(rv).14 G(ia N) +-3.5 E -1.33(AT)-.28 G F0 .452(The adv)72 214.8 R .452 +(antage of the virtual serv)-.25 F .452(er via N)-.15 F 2.672 -1.11 +(AT i)-.35 H 2.952(st)1.11 G .452(hat real serv)-2.952 F .452 +(ers can run an)-.15 F 2.953(yo)-.15 G .453 +(perating system that supports)-2.953 F .865(TCP/IP protocol, real serv) +72 226.8 R .864(ers can use pri)-.15 F -.25(va)-.25 G .864 +(te Internet addresses, and only an IP address is needed for the).25 F +(load balancer)72 238.8 Q(.)-.55 E .89(The disadv)72 254.4 R .89 +(antage is that the scalability of the virtual serv)-.25 F .891 +(er via N)-.15 F 3.111 -1.11(AT i)-.35 H 3.391(sn)1.11 G .891(ot v) +-3.391 F .891(ery good. The load balancer)-.15 F .601 +(may be a bottleneck of the whole system when the number of serv)72 +266.4 R .6(er nodes increase to around 25 or more)-.15 F .144 +(which depends on the throughout of real serv)72 278.4 R .145 +(ers, because both the request pack)-.15 F .145(ets and the reply pack) +-.1 F .145(ets are)-.1 F .771(need to be re)72 290.4 R .771 +(written by the load balancer)-.25 F 3.271(.S)-.55 G .771 +(upposing the a)-3.271 F -.15(ve)-.2 G .77(rage length of TCP pack).15 F +.77(ets is 536 Bytes, the)-.1 F -2.25 -.2(av e)72 302.4 T .109 +(rage delay of re).2 F .109(writing a pack)-.25 F .109 +(et is around 60us \(on the Pentium processor)-.1 F 2.61(,t)-.4 G .11 +(his can be reduced a little by)-2.61 F .986(using of f)72 314.4 R .986 +(aster processor\), the maximum throughout of the load balancer is 8.93\ + Mbytes/s. The load bal-)-.1 F(ancer can schedule 22 real serv)72 326.4 +Q(ers if the a)-.15 E -.15(ve)-.2 G(rage throughout of real serv).15 E +(ers is 400KBytes/s.)-.15 E -.6(Vi)72 342 S 1.643(rtual serv).6 F 1.643 +(er via N)-.15 F 3.863 -1.11(AT c)-.35 H 1.644 +(an meet the performance request of man)1.11 F 4.144(ys)-.15 G(erv) +-4.144 E 4.144(ers. When)-.15 F 1.644(the load balancer is)4.144 F .524 +(becoming a bottleneck of the whole system, there are tw)72 354 R 3.024 +(om)-.1 G .524(ethods to solv)-3.024 F 3.024(ei)-.15 G .524 +(t, one is the virtual serv)-3.024 F .524(er via)-.15 F .824 +(IP tunneling, and the other is the h)72 366 R .824 +(ybrid approach. In the h)-.05 F .824(ybrid approach, there are man)-.05 +F 3.325(yl)-.15 G .825(oad balancers)-3.325 F .977(which all ha)72 378 R +1.276 -.15(ve t)-.2 H .976(heir o).15 F .976(wn serv)-.25 F .976(er clu\ +sters, and the load balancers are grouped at a single domain name by) +-.15 F(Round-Round DNS.)72 390 Q F2 3.5(3.3.2. V)72 420 R(irtual ser) +-.518 E -.14(ve)-.14 G 3.5(rv).14 G(ia IP tunneling)-3.5 E F0 2.304 -.8 +(We c)72 442.8 T .704(an see from man).8 F 3.204(yI)-.15 G .705 +(nternet services \(such as web service\) that the incoming pack)-3.204 +F .705(ets are al)-.1 F -.1(wa)-.1 G .705(ys short).1 F .06 +(and reply pack)72 454.8 R .06(ets al)-.1 F -.1(wa)-.1 G .06 +(ys carry lar).1 F .059(ge amount of data. In the virtual serv)-.18 F +.059(er via IP tunneling, the load balancer)-.15 F .564 +(just schedules requests to the dif)72 466.8 R .565(ferent real serv) +-.25 F .565(ers, and the real serv)-.15 F .565 +(ers return replies directly to the users.)-.15 F 1.441(Thus the load b\ +alancer can handle huge amount of requests; it may schedule o)72 478.8 R +-.15(ve)-.15 G 3.94(r1).15 G 1.44(00 real serv)-3.94 F 1.44(ers and)-.15 +F -.1(wo)72 490.8 S(n').1 E 3.711(tb)-.18 G 3.711(et)-3.711 G 1.211(he \ +bottleneck of the system. Therefore, using IP tunneling will greatly in\ +crease the maximum)-3.711 F .388(number of serv)72 502.8 R .388 +(er nodes for a load balancer)-.15 F 2.888(.T)-.55 G .388 +(he maximum throughout of the virtual serv)-2.888 F .387(er may reach o) +-.15 F -.15(ve)-.15 G(r).15 E(1Gbps, e)72 514.8 Q -.15(ve)-.25 G 2.5(ni) +.15 G 2.5(ft)-2.5 G(he load balancer just has 100Mbps full-duple)-2.5 E +2.5(xn)-.15 G(etw)-2.5 E(ork adapter)-.1 E(.)-.55 E 1.151 +(The IP tunneling feature can be used to b)72 530.4 R 1.151(uild a v)-.2 +F 1.151(ery high-performance virtual serv)-.15 F(er)-.15 E 3.652(,e)-.4 +G 1.152(xtremely good to)-3.802 F -.2(bu)72 542.4 S .056 +(ild a virtual proxy cache serv).2 F(er)-.15 E 2.555(,b)-.4 G .055 +(ecause when the proxy serv)-2.555 F .055(ers recei)-.15 F .355 -.15 +(ve r)-.25 H .055(equest, it can access the Internet).15 F +(directly to fetch objects and return them directly to the users.)72 +554.4 Q(Ho)72 570 Q(we)-.25 E -.15(ve)-.25 G 1.752 -.4(r, v).15 H .952 +(irtual serv).4 F .952(er via IP tunneling requires real serv)-.15 F +.952(ers support IP T)-.15 F .953(unneling protocol. This feature)-.45 F +.636(has been tested with serv)72 582 R .636(ers running Linux.)-.15 F +.636(Since the IP tunneling protocol is becoming a standard of all)5.636 +F .942(operating systems, virtual serv)72 594 R .942 +(er via IP tunneling should be applicable to serv)-.15 F .943 +(ers running other operating)-.15 F(systems.)72 606 Q/F3 16/Times-Bold@0 +SF 4(4. Scheduling)72 639 R(Algorithms)4 E F0 3.056 -.8(We h)72 669 T +-2.25 -.2(av e).8 H 1.455 +(implemented four scheduling algorithms for selecting a serv)4.156 F +1.455(er from the cluster: Round-Robin,)-.15 F -.8(We)72 681 S 1.375 +(ighted Round-Robin, Least-Connection and W).8 F 1.375 +(eighted Least-Connection. The \214rst tw)-.8 F 3.875(oa)-.1 G 1.375 +(lgorithms are)-3.875 F(self-e)72 693 Q(xplanatory)-.15 E 3.299(,b)-.65 +G .799(ecause the)-3.299 F 3.299(yd)-.15 G(on')-3.299 E 3.299(th)-.18 G +-2.25 -.2(av e)-3.299 H(an)3.499 E 3.299(yl)-.15 G .799 +(oad information about the serv)-3.299 F .798(ers. The last tw)-.15 F +3.298(oa)-.1 G(lgorithms)-3.298 E .139(count acti)72 705 R .439 -.15 +(ve c)-.25 H .139(onnection number for each serv).15 F .14 +(er and estimate their load based on those connection numbers.)-.15 F EP +%%Page: 9 9 +%%BeginPageSetup +BP +%%EndPageSetup +/F0 10/Times-Roman@0 SF(-9-)282.17 48 Q/F1 15/Times-Bold@0 SF 3.75 +(4.1. Round-Robin)72 84 R(Scheduling)3.75 E F0 1.196 +(Round-robin scheduling algorithm, in its w)72 106.8 R 1.196 +(ord meaning, directs the netw)-.1 F 1.196(ork connections to the dif) +-.1 F(ferent)-.25 E(serv)72 118.8 Q .185(ers in the round-robin manner) +-.15 F 2.686(.I)-.55 G 2.686(tt)-2.686 G .186(reats all real serv)-2.686 +F .186(ers as equals re)-.15 F -.05(ga)-.15 G .186 +(rdless of number of connections or).05 F .286 +(response time. Although the round-robin DNS w)72 130.8 R .285 +(orks in this w)-.1 F(ay)-.1 E 2.785(,t)-.65 G .285(here are quite dif) +-2.785 F .285(ferent. The round-robin)-.25 F .404(DNS resolv)72 142.8 R +.404(es the single domain to the dif)-.15 F .405 +(ferent IP addresses, the scheduling granularity is host-based, and)-.25 +F .203(the caching of DNS hinder the algorithm tak)72 154.8 R 2.703(ee) +-.1 G -.25(ff)-2.703 G .203 +(ect, which will lead to signi\214cant dynamic load imbalance).25 F .628 +(among the real serv)72 166.8 R .629 +(ers. The scheduling granularity of virtual serv)-.15 F .629(er is netw) +-.15 F .629(ork connection-based, and it is)-.1 F(more superior to the \ +round-robin DNS due to the \214ne scheduling granularity)72 178.8 Q(.) +-.65 E F1 3.75(4.2. W)72 208.8 R(eighted Round-Robin Scheduling)-.975 E +F0 1.689(The weighted round-robin scheduling can treat the real serv)72 +231.6 R 1.689(ers of dif)-.15 F 1.689 +(ferent processing capacities. Each)-.25 F(serv)72 243.6 Q .642 +(er can be assigned a weight, an inte)-.15 F .642 +(ger that indicates the processing capacity)-.15 F 3.143(.T)-.65 G .643 +(he def)-3.143 F .643(ault weight is 1.)-.1 F -.15(Fo)72 255.6 S 4.57 +(re).15 G 2.07(xample, the real serv)-4.72 F 2.07(ers, A, B and C, ha) +-.15 F 2.369 -.15(ve t)-.2 H 2.069(he weights, 4, 3, 2 respecti).15 F +-.15(ve)-.25 G(ly).15 E 4.569(,ag)-.65 G 2.069(ood scheduling)-4.569 F +1.707(sequence will be ABCABCAB)72 267.6 R 4.207(Ai)-.35 G 4.207(nas) +-4.207 G 1.707(cheduling period \(mod sum\(W)-4.207 F 4.207(i\)\). In) +-.4 F 1.708(the implementation of the)4.207 F .472(weighted round-robin\ + scheduling, a scheduling sequence will be generated according to the s\ +erv)72 279.6 R .471(er weights)-.15 F 1.465 +(after the rules of virtual serv)72 291.6 R 1.466 +(er are modi\214ed. The netw)-.15 F 1.466 +(ork connections are directed to the dif)-.1 F 1.466(ferent real)-.25 F +(serv)72 303.6 Q +(ers based on the scheduling sequence in a round-robin manner)-.15 E(.) +-.55 E .825(The weighted round-robin scheduling doesn')72 319.2 R 3.324 +(tn)-.18 G .824(eed to count the netw)-3.324 F .824 +(ork connections for each real serv)-.1 F(er)-.15 E(,)-.4 E 1.996 +(and the o)72 331.2 R -.15(ve)-.15 G 1.996(rhead of scheduling is small\ +er than dynamic scheduling algorithms, it can ha).15 F 2.296 -.15(ve m) +-.2 H 1.996(ore real).15 F(serv)72 343.2 Q .083(ers. Ho)-.15 F(we)-.25 E +-.15(ve)-.25 G .883 -.4(r, i).15 H 2.583(tm).4 G .082 +(ay lead to dynamic load imbalance among the real serv)-2.583 F .082 +(ers if the load of requests v)-.15 F(ary)-.25 E(highly)72 355.2 Q 2.5 +(.I)-.65 G 2.5(ns)-2.5 G(hort, it is still possible that most of long r\ +equests may be directed to a real serv)-2.5 E(er)-.15 E(.)-.55 E F1 3.75 +(4.3. Least-Connection)72 385.2 R(Scheduling)3.75 E F0 .456 +(The least-connection scheduling algorithm directs netw)72 408 R .456 +(ork connections to the serv)-.1 F .456(er with the least number)-.15 F +.527(of acti)72 420 R .827 -.15(ve c)-.25 H .526(onnections. This is on\ +e of dynamic scheduling algorithms, because it needs to count acti).15 F +.826 -.15(ve c)-.25 H(on-).15 E .515(nections for each serv)72 432 R +.515(er dynamically)-.15 F 3.015(.A)-.65 G 3.015(tav)-3.015 G .515 +(irtual serv)-3.015 F .515(er where there is a collection of serv)-.15 F +.516(ers with similar)-.15 F .239 +(performance, the least-connection scheduling is good to smooth distrib) +72 444 R .238(ution when the load of requests v)-.2 F(ary)-.25 E 2.5(al) +72 456 S(ot, because all long requests w)-2.5 E(on')-.1 E 2.5(th)-.18 G +-2.25 -.2(av e)-2.5 H(chance to be directed to a serv)2.7 E(er)-.15 E(.) +-.55 E .04(At a \214rst look, the least-connection scheduling can also \ +perform well e)72 471.6 R -.15(ve)-.25 G 2.54(nw).15 G .04 +(hen there are serv)-2.54 F .04(ers of v)-.15 F(arious)-.25 E .962 +(processing capacities, because the f)72 483.6 R .962(aster serv)-.1 F +.962(er will get more netw)-.15 F .962(ork connections. In f)-.1 F .962 +(act, it cannot per)-.1 F(-)-.2 E 1.214(form v)72 495.6 R 1.214 +(ery well because of the TCP')-.15 F 3.714(sT)-.55 G(IME_W)-3.714 E +1.214(AIT state. The TCP')-1.2 F 3.714(sT)-.55 G(IME_W)-3.714 E 1.214 +(AIT is usually 2 minutes,)-1.2 F 1.069(between this 2 minutes a b)72 +507.6 R 1.068(usy web site often get thousands of connections, for e)-.2 +F 1.068(xample, the serv)-.15 F 1.068(er A is)-.15 F .641(twice as po)72 +519.6 R .641(werful as the serv)-.25 F .641(er B, the serv)-.15 F .641 +(er A has processing thousands of requests and k)-.15 F .641 +(ept them in the)-.1 F(TCP')72 531.6 Q 3.2(sT)-.55 G(IME_W)-3.2 E .7 +(AIT state, b)-1.2 F .7(ut the serv)-.2 F .7(er B is lagging to get its\ + thousands of connections \214nished. So, the)-.15 F .856 +(least-connection scheduling cannot get load well balanced among serv)72 +543.6 R .856(ers with v)-.15 F .856(arious processing capaci-)-.25 F +(ties.)72 555.6 Q F1 3.75(4.4. W)72 585.6 R +(eighted Least-Connection Scheduling)-.975 E F0 1.185(The weighted leas\ +t-connection scheduling is a superset of the least-connection schedulin\ +g, in which you)72 608.4 R .556 +(can assign a performance weight to each real serv)72 620.4 R(er)-.15 E +3.057(.T)-.55 G .557(he serv)-3.057 F .557(ers with a higher weight v) +-.15 F .557(alue will recei)-.25 F .857 -.15(ve a)-.25 H(lar)72 632.4 Q +1.977(ger percentage of acti)-.18 F 2.277 -.15(ve c)-.25 H 1.977 +(onnections at an).15 F 4.477(yo)-.15 G 1.977(ne time. The virtual serv) +-4.477 F 1.976(er administrator can assign a)-.15 F .074 +(weight to each real serv)72 644.4 R(er)-.15 E 2.574(,a)-.4 G .075 +(nd netw)-2.574 F .075(ork connections are scheduled to each serv)-.1 F +.075(er in which the percentage of)-.15 F(the current number of acti)72 +656.4 Q .3 -.15(ve c)-.25 H(onnections for each serv).15 E +(er is a ratio to its weight. The def)-.15 E(ault weight is one.)-.1 E +(The weighted least-connections scheduling w)72 672 Q(orks as follo)-.1 +E(ws:)-.25 E .429(Supposing there is n real serv)97 687.6 R .429 +(ers, each serv)-.15 F .429(er i has weight W)-.15 F 2.928(i\()-.4 G +.428(i=1,..,n\) and acti)-2.928 F .728 -.15(ve c)-.25 H(onnections).15 E +.214(Ci \(i=1,..,n\), ALL_CONNECTIONS is the sum of Ci \(i=1,..,n\), th\ +e netw)97 699.6 R .215(ork connection will be)-.1 F +(directed to the serv)97 711.6 Q(er j, in which)-.15 E(\()118.48 729.6 Q +/F2 10/Times-Italic@0 SF(C)-.16 E/F3 7/Times-Italic@0 SF(j)1.648 2 M F0 +(/).836 -2 M F2(ALL)1.01 E F0(_).53 E F2(CONNECTIONS)-.16 E F0(\)/).58 E +F2(W)-.21 E F3(j)1.648 2 M/F4 10/Symbol SF(=)3.636 -2 M F0(min)2.8 E({) +1.7 -.105 M(\().105 I F2(C)-.16 E F3(i).437 2 M F0(/).752 -2 M F2(ALL) +1.01 E F0(_).53 E F2(CONNECTIONS)-.16 E F0(\)/).58 E F2(W)-.21 E F3(i) +.437 2 M F0(}).752 -2.105 M(\().105 I F2(i).01 E F4(=)3.16 E F0 -.8 +(1, . . ,)2.8 F F2(n)2.06 E F0(\)).24 E EP +%%Page: 10 10 +%%BeginPageSetup +BP +%%EndPageSetup +/F0 10/Times-Roman@0 SF(-10-)279.67 48 Q .506(Since the ALL_CONNECTIONS\ + is a constant in this lookup, there is no need to di)97 84 R .506 +(vide Ci by)-.25 F(ALL_CONNECTIONS, it can be optimized as)97 96 Q/F1 10 +/Times-Italic@0 SF(C)219.74 114 Q/F2 7/Times-Italic@0 SF(j)1.648 2 M F0 +(/).836 -2 M F1(W)-.21 E F2(j)1.648 2 M/F3 10/Symbol SF(=)3.636 -2 M F0 +(min)2.8 E({)1.7 -.105 M F1(C)-.16 .105 M F2(i).437 2 M F0(/).752 -2 M +F1(W)-.21 E F2(i).437 2 M F0(}).752 -2.105 M(\().105 I F1(i).01 E F3(=) +3.16 E F0 -.8(1, . . ,)2.8 F F1(n)2.06 E F0(\)).24 E .536(The weighted \ +least-connection scheduling algorithm requires additional di)72 135.6 R +.536(vision than the least-connection.)-.25 F .143 +(In a hope to minimize the o)72 147.6 R -.15(ve)-.15 G .143 +(rhead of scheduling when serv).15 F .143(ers ha)-.15 F .443 -.15(ve t) +-.2 H .143(he same processing capacity).15 F 2.643(,b)-.65 G .142 +(oth the)-2.643 F(least-connection scheduling and the weighted least-co\ +nnection scheduling algorithms are implemented.)72 159.6 Q/F4 16 +/Times-Bold@0 SF 4(5. High)72 192.6 R -.96 -1.6(Av a)4 H(ilability)1.6 E +F0 .084(As more and more critical commercial applications mo)72 222.6 R +.384 -.15(ve o)-.15 H 2.584(nt).15 G .084(he Internet, pro)-2.584 F .085 +(viding highly a)-.15 F -.25(va)-.2 G .085(ilable serv).25 F(ers)-.15 E +1.038(becomes increasingly important. One of the adv)72 234.6 R 1.037 +(antages of a clustered system is that it has hardw)-.25 F 1.037 +(are and)-.1 F(softw)72 246.6 Q .323(are redundanc)-.1 F 1.623 -.65 +(y. H)-.15 H .323(igh a).65 F -.25(va)-.2 G .323(ilability can be pro) +.25 F .324(vided by detecting node or daemon f)-.15 F .324 +(ailures and recon\214g-)-.1 F .096 +(uring the system appropriately so that the w)72 258.6 R .096 +(orkload can be tak)-.1 F .096(en o)-.1 F -.15(ve)-.15 G 2.596(rb).15 G +2.596(yt)-2.596 G .096(he remaining nodes in the cluster)-2.596 F(.)-.55 +E 1.526(The high a)72 274.2 R -.25(va)-.2 G 1.527 +(ilability of virtual serv).25 F 1.527(er is no)-.15 F 4.027(wp)-.25 G +(ro)-4.027 E 1.527(vided by using of "mon")-.15 F/F5 7/Times-Roman@0 SF +(15)-4.1 I F0 1.527(and "f)4.027 4.1 N(ak)-.1 E(e")-.1 E F5(16)-4.1 I F0 +(softw)4.027 4.1 M 1.527(are. The)-.1 F 1.457("mon" is a general-purpos\ +e resource monitoring system, which can be used to monitor netw)72 286.2 +R 1.457(ork service)-.1 F -.2(av)72 298.2 S(ailability and serv)-.05 E +(er nodes. F)-.15 E(ak)-.15 E 2.5(ei)-.1 G 2.5(sI)-2.5 G 2.5(Pt)-2.5 G +(ak)-2.5 E(e-o)-.1 E -.15(ve)-.15 G 2.5(rs).15 G(oftw)-2.5 E +(are by using of ARP spoo\214ng.)-.1 E .211(The serv)72 313.8 R .211 +(er f)-.15 F(ailo)-.1 E -.15(ve)-.15 G 2.711(ri).15 G 2.711(sh)-2.711 G +.211(andle as follo)-2.711 F .211 +(ws: The "mon" daemon is running on the load balancer to monitor ser) +-.25 F(-)-.2 E .375(vice daemons and serv)72 325.8 R .375 +(er nodes in the cluster)-.15 F 5.374(.T)-.55 G .374 +(he fping.monitor is con\214gured to detect whether the serv)-5.374 F +(er)-.15 E .445(nodes is ali)72 337.8 R .745 -.15(ve e)-.25 H -.15(ve) +-.1 G .445(ry t seconds, and the relati).15 F .745 -.15(ve s)-.25 H .445 +(ervice monitor is also con\214gured to detect the service dae-).15 F .6 +(mons on all the nodes e)72 349.8 R -.15(ve)-.25 G .6(ry m minutes. F) +.15 F .6(or e)-.15 F .6 +(xample, http.monitor can be used to check the http services;)-.15 F +.284(ftp.monitor is for the ftp services, and so on. An alert w)72 361.8 +R .284(as written to remo)-.1 F -.15(ve)-.15 G .284 +(/add a rule in the virtual serv).15 F(er)-.15 E .019 +(table while detecting the serv)72 373.8 R .019(er node or daemon is do) +-.15 F 2.519(wn/up. Therefore,)-.25 F .018 +(the load balancer can automatically)2.518 F +(mask service daemons or serv)72 385.8 Q(ers f)-.15 E +(ailure and put them into service when the)-.1 E 2.5(ya)-.15 G(re back.) +-2.5 E(No)72 401.4 Q 1.854 -.65(w, t)-.25 H .554 +(he load balancer becomes a single f).65 F .554 +(ailure point of the whole system.)-.1 F .555(In order to pre)5.555 F +-.15(ve)-.25 G .555(nt the f).15 F(ailure)-.1 E .465 +(of the load balancer)72 413.4 R 2.965(,s)-.4 G .465(etup a backup serv) +-2.965 F .465(er of the load balancer)-.15 F 2.965(,t)-.4 G .465(he "f) +-2.965 F(ak)-.1 E .465(e" softw)-.1 F .464(are is used for the backup) +-.1 F .484(to tak)72 425.4 R(eo)-.1 E -.15(ve)-.15 G 2.984(rt).15 G .484 +(he IP addresses of the load balancer when the load balancer f)-2.984 F +.484(ails. Ag)-.1 F .485(ain, the "mon" is used to)-.05 F .257 +(detect the status of the load balancer to acti)72 437.4 R -.25(va)-.25 +G(te/deacti).25 E -.25(va)-.25 G .256(te the "f).25 F(ak)-.1 E .256 +(e" on the backup serv)-.1 F(er)-.15 E 2.756(.T)-.55 G .256 +(he "mon" dae-)-2.756 F .728(mon also runs on the backup so that the ba\ +ckup has current status of the cluster)72 449.4 R 5.728(.W)-.55 G .728 +(hen the primary f)-5.728 F(ails,)-.1 E .05(the backup will tak)72 461.4 +R 2.55(eo)-.1 G -.15(ve)-2.7 G 2.55(ri).15 G .049 +(ts IP address\(es\) to continue to pro)-2.55 F .049(vide services, ho) +-.15 F(we)-.25 E -.15(ve)-.25 G 2.549(rt).15 G .049 +(he established connec-)-2.549 F .37(tion in the hash table will be los\ +t in the current implementation, which will require the clients to send\ + their)72 473.4 R(requests ag)72 485.4 Q(ain.)-.05 E F4 4(6. Conclusion) +72 518.4 R(and Futur)4 E 4(eW)-.288 G(ork)-5.2 E F0 2.073 -.8(We h)72 +548.4 T -2.25 -.2(av e).8 H .473(demonstrated ho)3.173 F 2.973(wt)-.25 G +2.973(oc)-2.973 G .473(reate Linux virtual serv)-2.973 F .473 +(ers based on a cluster of real serv)-.15 F .473(ers. T)-.15 F .672 -.1 +(wo m)-.8 H(ethods).1 E .24(of IP-le)72 560.4 R -.15(ve)-.25 G 2.74(ll) +.15 G .24(oad balancing were de)-2.74 F -.15(ve)-.25 G .24(loped to mak) +.15 F 2.74(ep)-.1 G .241 +(arallel services of the cluster to appear as a virtual ser)-2.74 F(-) +-.2 E .096(vice on a single IP address, one is virtual serv)72 572.4 R +.096(er via Netw)-.15 F .095(ork Address T)-.1 F .095 +(ranslation, the other is virtual serv)-.35 F(er)-.15 E 1.004 +(via IP tunneling. Currently four scheduling algorithms ha)72 584.4 R +1.305 -.15(ve b)-.2 H 1.005(een de).15 F -.15(ve)-.25 G 1.005 +(loped to meet dif).15 F 1.005(ferent application)-.25 F 2.555 +(situations. Scalability)72 596.4 R .055(is achie)2.555 F -.15(ve)-.25 G +2.555(db).15 G 2.555(yt)-2.555 G .055(ransparently adding or remo)-2.555 +F .054(ving a node in the cluster)-.15 F 2.554(.H)-.55 G .054(igh a) +-2.554 F -.25(va)-.2 G(ilabil-).25 E .456(ity is pro)72 608.4 R .456 +(vided by detecting node or daemon f)-.15 F .457 +(ailures and recon\214guring the system appropriately)-.1 F 2.957(.T) +-.65 G .457(he solu-)-2.957 F .917 +(tions require no modi\214cation to either the clients or the serv)72 +620.4 R .917(ers, and the)-.15 F 3.416(ys)-.15 G .916 +(upport most of TCP and UDP)-3.416 F(services.)72 632.4 Q .069 +(In the future, we w)72 648 R .069 +(ould study and add more load-balancing algorithms to meet more dif)-.1 +F .07(ferent requirements,)-.25 F .449(such as the load-informed schedu\ +ling, and geographic-based scheduling for virtual serv)72 660 R .449 +(er via IP tunneling.)-.15 F 1.83 -.8(We w)72 672 T .23(ould lik).7 F +2.73(et)-.1 G 2.73(oi)-2.73 G(nte)-2.73 E .23 +(grate the "heartbeat" code and the COD)-.15 F 2.73(Ad)-.4 G(istrib) +-2.73 E .23(uted f)-.2 F .23(ault-tolerant \214lesystem into vir)-.1 F +(-)-.2 E .942(tual serv)72 684 R(er)-.15 E 3.442(,d)-.4 G -2.15 -.25 +(ev e)-3.442 H .942(lop a cluster manager).25 F 3.442(,a)-.4 G .942 +(nd mak)-3.442 F 3.442(ei)-.1 G 3.442(te)-3.442 G .942 +(asy to setup and administrator Linux virtual serv)-3.442 F(ers.)-.15 E +1.644 -.8(We w)72 696 T .044(ould e).7 F .044(xplore higher de)-.15 F +.044(grees of f)-.15 F .044 +(ault-tolerance; transaction and logging process)-.1 F F5(17)-4.1 I F0 +-.1(wo)2.544 4.1 O .044(uld be tried to add).1 F .64(in the load balanc\ +er so that the load balancer can restart the request on another serv)72 +708 R .64(er and the client don')-.15 F(t)-.18 E .328 +(need to send the request ag)72 720 R .328 +(ain, and the primary and backup load balancers e)-.05 F .329 +(xchange their states so that the)-.15 F EP +%%Page: 11 11 +%%BeginPageSetup +BP +%%EndPageSetup +/F0 10/Times-Roman@0 SF(-11-)279.67 48 Q -.15(ex)72 84 S .254 +(isting connection w).15 F(on')-.1 E 2.754(tb)-.18 G 2.754(el)-2.754 G +.254(ost when the backup tak)-2.754 F .253(es o)-.1 F -.15(ve)-.15 G +1.353 -.55(r. W).15 H 2.753(ew)-.25 G .253(ould also lik)-2.853 F 2.753 +(et)-.1 G 2.753(oe)-2.753 G .253(xplore ho)-2.903 F 2.753(wt)-.25 G +2.753(oi)-2.753 G(mple-)-2.753 E(ment virtual serv)72 96 Q(er in IPv6.) +-.15 E/F1 18/Times-Bold@0 SF(Refer)72 132 Q(ences)-.324 E F0 15(1. Chad) +72 162 R -1.1(Yo)3.54 G(shika)1.1 E -.1(wa)-.15 G 3.54(,B).1 G 1.04 +(rent Chun, P)-3.54 F 1.04(aul Eastharn, Armin V)-.15 F 1.04 +(ahdat, Thomas Anderson, and Da)-1.11 F 1.04(vid Culler)-.2 F(,)-.4 E +(\231Using Smart Clients to Build Scalable Services,)97 174 Q<9a>-.7 E +/F2 10/Times-Italic@0 SF(USENIX'97)2.5 E F0(\(1997\). http://no)2.5 E +-.65(w.)-.25 G(cs.berk).65 E(ele)-.1 E -.65(y.)-.15 G(edu/.).65 E 15 +(2. Robert)72 189.6 R 1.773(L. Carter and Mark E. Cro)4.274 F -.15(ve) +-.15 G 1.773(lla, \231Dynamic Serv).15 F 1.773 +(er Selection using Bandwidth Probing in)-.15 F -.4(Wi)97 201.6 S +(de-Area Netw).4 E(orks,)-.1 E 2.5<9a42>-.7 G(oston Uni)-2.5 E -.15(ve) +-.25 G(rsity T).15 E(echnical Report \(1996\). http://www)-.7 E +(.ncstrl.or)-.65 E(g/.)-.18 E 15(3. Eric)72 217.2 R .304 +(Dean Katz, Michelle Butler)2.804 F 2.804(,a)-.4 G .304 +(nd Robert McGrath, \231)-2.804 F 2.804(AS)-.8 G .304(calable HTTP Serv) +-2.804 F .305(er: The NCSA Proto-)-.15 F(type,)97 229.2 Q<9a>-.7 E F2 +(Computer Networks and ISDN Systems,)2.5 E F0(pp. 155-163 \(May 1994\).) +2.5 E 15(4. Thomas)72 244.8 R 3.469 -.74(T. K)4.489 H -.1(wa).74 G 1.989 +(n, Robert E. McGrath, and Daniel A. Reed, \231NCSA).1 F 3.088 -.55 +('s W)-1.11 H 1.988(orld W)-.25 F 1.988(ide W)-.4 F 1.988(eb Serv)-.8 F +(er:)-.15 E(Design and Performance,)97 256.8 Q<9a>-.7 E F2 +(IEEE Computer)2.5 E(,)-1.11 E F0(pp. 68-74 \(No)2.5 E -.15(ve)-.15 G +(mber 1995\).).15 E 15(5. T)72 272.4 R 2.5(.B)-.74 G(risco,)-2.5 E F2 +(DNS Support for Load Balancing)2.5 E(,)-.1 E F0(RFC 1794. http://www) +2.5 E(.internic.net/ds/.)-.65 E 15(6. A.)72 288 R .742 +(Dahlin, M. Frober)3.242 F .742(g, J. W)-.18 F .743(alerud, and P)-.8 F +3.243(.W)-1.11 G(inroth,)-3.643 E F2 .743(EDDIE: A Rob)3.243 F .743 +(ust and Scalable Internet Server)-.2 F F0(\(May 1998\). http://www)97 +300 Q(.eddie)-.65 E -.1(wa)-.25 G(re.or).1 E(g/.)-.18 E 15(7. Ralf)72 +315.6 R 1.464(S.Engelschall, \231Load Balancing Y)3.964 F 1.464(our W) +-1.1 F 1.463(eb Site: Practical Approaches for Distrib)-.8 F 1.463 +(uting HTTP)-.2 F -.35(Tr)97 327.6 S(af).35 E(\214c,)-.25 E<9a>-.7 E F2 +-.92(We)2.5 G 2.5(bT).92 G(ec)-3.42 E(hniques Ma)-.15 E(gazine)-.1 E(,) +-.1 E F0(3, 5 \(May 1998\). http://www)2.5 E(.webtechniques.com/.)-.65 E +15(8. Edw)72 343.2 R 12.45(ard W)-.1 F(alk)-.8 E(er)-.1 E(,)-.4 E F2 +12.45(pWEB - A P)14.95 F(ar)-.8 E 12.45(allel W)-.15 F 12.45 +(eb Server Harness)-.92 F F0 12.45(\(April, 1997\).)14.95 F(http://www) +97 355.2 Q(.ihpc.nus.edu.sg/ST)-.65 E(AFF/edw)-.93 E(ard/pweb)-.1 E +(.html.)-.4 E 15(9. Daniel)72 370.8 R .507(Andresen, T)3.007 F .507 +(ao Y)-.8 F .507(ang, and Oscar H. Ibarra, \231T)-1 F -2.1 -.25(ow a)-.8 +H .506(rds a Scalable Distrib).25 F .506(uted WWW Serv)-.2 F .506(er on) +-.15 F -.8(Wo)97 382.8 S .222(rkstation Clusters,).8 F<9a>-.7 E F2(Pr) +2.722 E .222(oc. of 10th IEEE Intl. Symp. Of P)-.45 F(ar)-.8 E .223 +(allel Pr)-.15 F .223(ocessing \(IPPS'96\),)-.45 F F0 .223(pp. 850-856) +2.723 F(\(Arpil 1996\). http://www)97 394.8 Q(.cs.ucsb)-.65 E +(.edu/Research/rapid_sweb/SWEB.html.)-.4 E 10(10. Eric)72 410.4 R 1.373 +(Anderson, Da)3.873 F 1.673 -.15(ve Pa)-.2 H 1.372 +(tterson, and Eric Bre).15 F(wer)-.25 E(,)-.4 E F2 1.372(The Ma)3.872 F +(gicr)-.1 E 1.372(outer: an Application of F)-.45 F 1.372(ast P)-.75 F +(ac)-.8 E -.1(ke)-.2 G(t).1 E(Interposing)97 422.4 Q F0 +(\(May 1996\). http://www)2.5 E(.cs.berk)-.65 E(ele)-.1 E -.65(y.)-.15 G +(edu/~eanders/magicrouter/.).65 E 10(11. Cisco)72 438 R(System,)2.951 E +F2 .452(Cisco Local Dir)2.951 F(ector)-.37 E F0 .452 +(\(1998\). http://www)2.952 F(.cisco.com/w)-.65 E +(arp/public/751/lodir/inde)-.1 E(x.html.)-.15 E 10(12. D.)72 453.6 R +.658(Dias, W)3.158 F 3.158(.K)-.92 G .658(ish, R. Mukherjee, and R. T) +-3.158 F -2.1 -.25(ew a)-.7 H .658(ri, \231).25 F 3.158(AS)-.8 G .658 +(calable and Highly A)-3.158 F -.25(va)-.74 G .658(ilable Serv).25 F(er) +-.15 E -.7<2c9a>-.4 G F2(COMP-)3.858 E(CON 1996,)97 465.6 Q F0 +(pp. 85-92 \(1996\).)2.5 E 10(13. Om)72 481.2 R 2.272 -1.11(P. D)2.552 H +.052(amani, P)1.11 F 2.552(.E)-1.11 G .052(merald Chung, and Y)-2.552 F +.052(ennun Huang,)-1 F F2 .052(ONE-IP: T)2.552 F(ec)-.92 E .052 +(hniques for Hosting a Service on)-.15 F 2.5(aC)97 493.2 S +(luster of Mac)-2.5 E(hines)-.15 E F0(\(August 1997\). http://www)2.5 E +(.cs.ute)-.65 E(xas.edu/users/damani/.)-.15 E 10(14. W)72 508.8 R 5.863 +(ensong Zhang,)-.8 F F2 5.863(Linux V)8.363 F 5.863(irtual Server Pr) +-.74 F(oject)-.45 E F0 5.862(\(May 1998\). http://proxy)8.362 F +(.iinchina.net/~wen-)-.65 E(song/ippfvs/.)97 520.8 Q 10(15. Jim)72 536.4 +R -.35(Tr)2.5 G(ocki,).35 E F2(mon: Service Monitoring Daemon)2.5 E F0 +(\(July 1998\). http://consult.ml.or)2.5 E(g/~trockij/mon/.)-.18 E 10 +(16. Simon)72 552 R .776(Horman, \231Creating Redundant Linux Serv)3.276 +F(ers,)-.15 E<9a>-.7 E F2 .777(The 4th Annual LinuxExpo Confer)3.276 F +(ence)-.37 E F0(\(May)3.277 E(1998\). http://linux.zipw)97 564 Q +(orld.com.au/f)-.1 E(ak)-.1 E(e/.)-.1 E 10(17. 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Bach, The design of the UNIX operating system, Prentice-Hall, Inc., Upper Saddle River, NJ, 1986
+
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neg exch neg +exch translate + 1495 2883 a Fp(V)-8 b(ersion)1787 2883 +y + currentpoint grestore moveto + 1787 2883 a 1627 2917 4 552 v 1818 2883 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 1818 2883 +a Fp(Arc)m(hitektur)2278 2883 y + currentpoint grestore moveto + 2278 2883 a 1943 2917 +4 552 v 2142 2883 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 2142 2883 a Fp(BogoMips)2536 2883 +y + currentpoint grestore moveto + 2536 2883 a 2294 2917 4 552 v 2448 2883 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 2448 2883 +a Fp(F)g(estplatte)2841 2883 y + currentpoint grestore moveto + 2841 2883 a 2554 2917 +4 552 v 2717 2883 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 2717 2883 a Fp(DRBD)30 b(n.)40 b(v.)3234 +2883 y + currentpoint grestore moveto + 3234 2883 a 2814 2917 4 552 v 2977 2883 a + gsave currentpoint 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3166 V 128 w(i586)p 1943 +3166 V 151 w(47,82)p 2294 3166 V 123 w(2,05)p 2554 3166 +V 100 w(1,16)p 2814 3166 V 101 w(0,95)p 3075 3166 V 100 +w(0,94)p 3335 3166 V 100 w(0,93)p 3595 3166 V 809 3169 +2788 4 v 859 3414 a(Netzw)m(erkbandbreite:)103 b(1,04)31 +b(MB/s)498 b(Datengr\366\377e:)101 b(55)31 b(MB)1045 +3527 y(Netzw)m(erklatenz:)102 b(0,5/0,5/0,7)32 b(ms)199 +b(DRBD)30 b(V)-8 b(ersion:)100 b(0.5.3)493 3796 y(3.)648 +4007 y(\(a\))p 809 4128 3009 4 v 807 4679 4 552 v 922 +4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 922 4645 a Fp(Knoten)1213 4645 y + currentpoint grestore moveto + 1213 4645 a 970 +4679 4 552 v 1157 4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 1157 4645 a Fp(System)1442 4645 +y + currentpoint grestore moveto + 1442 4645 a 1297 4679 4 552 v 1588 4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 1588 4645 +a Fp(V)-8 b(ersion)1880 4645 y + currentpoint grestore moveto + 1880 4645 a 1813 4679 +4 552 v 1976 4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 1976 4645 a Fp(Arc)m(hitektur)2436 +4645 y + currentpoint grestore moveto + 2436 4645 a 2073 4679 4 552 v 2273 4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 2273 +4645 a Fp(BogoMips)2666 4645 y + currentpoint grestore moveto + 2666 4645 a 2424 4679 +4 552 v 2601 4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 2601 4645 a Fp(F)g(estplatte)2995 +4645 y + currentpoint grestore moveto + 2995 4645 a 2730 4679 4 552 v 2915 4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 2915 +4645 a Fp(DRBD)30 b(n.)41 b(v.)3433 4645 y + currentpoint grestore moveto + 3433 4645 +a 3035 4679 4 552 v 3198 4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 3198 4645 a Fp(Prot.)h(A)3508 +4645 y + currentpoint grestore moveto + 3508 4645 a 3296 4679 4 552 v 3459 4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 3459 +4645 a Fp(Prot.)f(B)3765 4645 y + currentpoint grestore moveto + 3765 4645 a 3556 4679 +4 552 v 3719 4645 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 3719 4645 a Fp(Prot.)g(C)4027 4645 +y + currentpoint grestore moveto + 4027 4645 a 3816 4679 4 552 v 809 4682 3009 4 v 809 +4699 V 807 4812 4 113 v 868 4778 a Fp(1)p 970 4812 V +108 w(Lin)m(ux)p 1297 4812 V 124 w(2.2.14-9cl)p 1813 +4812 V 124 w(i586)p 2073 4812 V 100 w(897,84)p 2424 4812 +V 101 w(11,17)p 2730 4812 V 100 w(10,21)p 3035 4812 V +101 w(3,67)p 3296 4812 V 100 w(3,59)p 3556 4812 V 100 +w(3,56)p 3816 4812 V 809 4815 3009 4 v 807 4928 4 113 +v 868 4894 a(2)p 970 4928 V 108 w(Lin)m(ux)p 1297 4928 +V 101 w(2.2.14-14cl)p 1813 4928 V 102 w(i586)p 2073 4928 +V 100 w(799,54)p 2424 4928 V 123 w(8,66)p 2730 4928 V +168 w(7,8)p 3035 4928 V 168 w(3,8)p 3296 4928 V 123 w(3,69)p +3556 4928 V 100 w(3,99)p 3816 4928 V 809 4931 3009 4 +v 859 5176 a(Netzw)m(erkbandbreite:)103 b(8,6)30 b(MB/s)544 +b(Datengr\366\377e:)101 b(100)31 b(MB)1045 5289 y(Netzw)m(erklatenz:) +102 b(0,0/0,0/0,3)32 b(ms)199 b(DRBD)30 b(V)-8 b(ersion:)100 +b(0.5.3)1831 5622 y(82)p eop +%%Page: 83 85 +83 84 bop 382 262 a Fl(ANHANG)29 b(A.)60 b(ME\337ER)m(GEBNISSE)p +382 299 2989 4 v 643 539 a Fp(\(b\))p 809 660 2964 4 +v 807 1211 4 552 v 922 1178 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 922 1178 a Fp(Knoten)1213 +1178 y + currentpoint grestore moveto + 1213 1178 a 970 1211 4 552 v 1157 1178 a + gsave currentpoint currentpoint translate 90 neg rotate neg exch neg +exch translate + 1157 +1178 a Fp(System)1442 1178 y + currentpoint grestore moveto + 1442 1178 a 1297 1211 4 +552 v 1588 1178 a + gsave currentpoint currentpoint translate 90 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