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Internet Small Computer System Interface (iSCSI) Protocol (Consolidated)
RFC 7143

Internet Engineering Task Force (IETF)                    M. Chadalapaka
Request for Comments: 7143                                     Microsoft
Obsoletes: 3720, 3980, 4850, 5048                              J. Satran
Updates: 3721                                             Infinidat Ltd.
Category: Standards Track                                        K. Meth
ISSN: 2070-1721                                                      IBM
                                                                D. Black
                                                                     EMC
                                                              April 2014

       Internet Small Computer System Interface (iSCSI) Protocol
                             (Consolidated)

Abstract

   This document describes a transport protocol for SCSI that works on
   top of TCP.  The iSCSI protocol aims to be fully compliant with the
   standardized SCSI Architecture Model (SAM-2).  RFC 3720 defined the
   original iSCSI protocol.  RFC 3721 discusses iSCSI naming examples
   and discovery techniques.  Subsequently, RFC 3980 added an additional
   naming format to the iSCSI protocol.  RFC 4850 followed up by adding
   a new public extension key to iSCSI.  RFC 5048 offered a number of
   clarifications as well as a few improvements and corrections to the
   original iSCSI protocol.

   This document obsoletes RFCs 3720, 3980, 4850, and 5048 by
   consolidating them into a single document and making additional
   updates to the consolidated specification.  This document also
   updates RFC 3721.  The text in this document thus supersedes the text
   in all the noted RFCs wherever there is a difference in semantics.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7143.

Chadalapaka, et al.          Standards Track                    [Page 1]
RFC 7143                  iSCSI (Consolidated)                April 2014

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ...................................................11
   2. Acronyms, Definitions, and Document Summary ....................11
      2.1. Acronyms ..................................................11
      2.2. Definitions ...............................................13
      2.3. Summary of Changes ........................................19
      2.4. Conventions ...............................................20
   3. UML Conventions ................................................20
      3.1. UML Conventions Overview ..................................20
      3.2. Multiplicity Notion .......................................21
      3.3. Class Diagram Conventions .................................22
      3.4. Class Diagram Notation for Associations ...................23
      3.5. Class Diagram Notation for Aggregations ...................24
      3.6. Class Diagram Notation for Generalizations ................25
   4. Overview .......................................................25
      4.1. SCSI Concepts .............................................25
      4.2. iSCSI Concepts and Functional Overview ....................26
           4.2.1. Layers and Sessions ................................27
           4.2.2. Ordering and iSCSI Numbering .......................28
                  4.2.2.1. Command Numbering and Acknowledging .......28
                  4.2.2.2. Response/Status Numbering and
                           Acknowledging .............................32
                  4.2.2.3. Response Ordering .........................32
                           4.2.2.3.1. Need for Response Ordering .....32
                           4.2.2.3.2. Response Ordering Model

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