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 2014Copyright Notice
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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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