ISO/IEC 14776-224:2019

ISO/IEC 14776-224
Edition 1.0 2019-10
INTERNATIONAL
STANDARD
Information technology – Small computer system interface (SCSI) –
Part 224: Fibre Channel Protocol for SCSI, fourth version (FCP-4)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about
ISO/IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address
below or your local IEC member National Committee for further information.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: sales@iec.ch.
ISO/IEC 14776-224
Edition 1.0 2019-10
INTERNATIONAL
STANDARD
Information technology – Small computer system interface (SCSI) –

Part 224: Fibre Channel Protocol for SCSI, fourth version (FCP-4)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.200 ISBN 978-2-8322-7520-7

Contents
FOREWORD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3 Terms, definitions, abbreviations and conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 Terms and definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.3 Keywords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.4 Editorial conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.1 Structure and concepts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.2 FCP I/O operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.3 Bidirectional and unidirectional commands and FCP_RSP IU format . . . . . . . . . . . . . . . . . 26
4.4 Precise delivery of commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.5 Confirmed completion of FCP I/O operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.6 Retransmission of unsuccessfully transmitted IUs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.7 Task retry identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.8 Discovery of FCP capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.9 Task management functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.9.1 Task management functions overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.9.2 ABORT TASK task management function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.9.3 QUERY TASK task management function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.10 Clearing effects of task management, FCP, FC-FS-3, FC-LS-2, and FC-AL-2 actions . . . 32
4.11 I_T nexus loss notification events. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.12 Transport Reset notification events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.13 Port Login/Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.14 Process Login and Process Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.15 Link management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.16 FCP addressing and Exchange identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.17 Use of Worldwide_Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5 FC-FS-3 frame header. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.1 FC-FS-3 frame header overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2 FC-FS-3 frame header fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2.1 R_CTL field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2.2 D_ID field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2.3 CS_CTL field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2.4 S_ID field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2.5 TYPE field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2.6 F_CTL field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2.7 SEQ_ID field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2.8 DF_CTL field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2.9 SEQ_CNT field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2.10 OX_ID field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2.11 RX_ID field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2.12 PARAMETER field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6 FCP link service definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.1 Overview of link service requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.2 Overview of Process Login and Process Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.3 PRLI ELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.3.1 Use of PRLI ELS by the Fibre Channel Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.3.2 New or repeated Process Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

- 3 - ISO/IEC 14776-224:2019 © ISO/IEC 2019
6.3.3 PRLI ELS request FCP Service Parameter page format. . . . . . . . . . . . . . . . . . . . . 41
6.3.4 PRLI ELS accept FCP Service Parameter page format . . . . . . . . . . . . . . . . . . . . . 44
6.4 PRLO ELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.5 Read Exchange Concise (REC) ELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7 FC-4 specific Name Server registration and objects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.1 Overview of FC-4 specific objects for the Fibre Channel Protocol . . . . . . . . . . . . . . . . . . . . 47
7.2 FC-4 TYPEs object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.3 FC-4 Features object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8 FCP FC-4 Link Service (FCP_LS) definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8.1 FCP_LS overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8.2 Sequence Retransmission Request (SRR) FCP_LS request. . . . . . . . . . . . . . . . . . . . . . . . 49
8.3 FCP_LS Accept (FCP_ACC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
8.4 FCP_LS Reject (FCP_RJT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9 FCP Information Unit (IU) usage and formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.1 FCP Information Unit (IU) usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.2 FCP_CMND IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.2.1 Overview and format of FCP_CMND IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.2.2 FCP_CMND IU field descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.2.2.1 FCP_LUN field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.2.2.2 COMMAND REFERENCE NUMBER field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.2.2.3 COMMAND PRIORITY field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.2.2.4 TASK ATTRIBUTE field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.2.2.5 TASK MANAGEMENT FLAGS FIELD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.2.2.6 ADDITIONAL FCP_CDB LENGTH field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
9.2.2.7 RDDATA bit and WRDATA bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
9.2.2.8 FCP_CDB field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.2.2.9 ADDITIONAL_FCP_CDB field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.2.2.10 FCP_DL field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.2.2.11 FCP_BIDIRECTIONAL_READ_DL field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.3 FCP_XFER_RDY IU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.3.1 Overview and format of FCP_XFER_RDY IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.3.2 FCP_DATA_RO field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.3.3 FCP_BURST_LEN field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.4 FCP_DATA IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.4.1 FCP_DATA IU overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.4.2 FCP_DATA IUs for read and write operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.4.3 FCP_DATA IUs for bidirectional commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
9.4.4 FCP_DATA IU use of fill bytes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
9.5 FCP_RSP IU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
9.5.1 Overview and format of FCP_RSP IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
9.5.2 STATUS QUALIFIER field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
9.5.3 FCP_BIDI_RSP bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
9.5.4 FCP_BIDI_READ_RESID_UNDER bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
9.5.5 FCP_BIDI_READ_RESID_OVER bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.5.6 FCP_CONF_REQ bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.5.7 FCP_RESID_UNDER bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.5.8 FCP_RESID_OVER bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.5.9 FCP_SNS_LEN_VALID bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.5.10 FCP_RSP_LEN_VALID bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.5.11 SCSI STATUS CODE field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.5.12 FCP_RESID field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.5.13 FCP_BIDIRECTIONAL_READ_RESID field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9.5.14 FCP_SNS_LEN field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
9.5.15 FCP_RSP_LEN field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
9.5.16 FCP_RSP_INFO field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
9.5.17 FCP_SNS_INFO field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

9.6 FCP_CONF IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
10 SCSI mode parameters for the Fibre Channel Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
10.1 Overview of mode pages for the Fibre Channel Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . 69
10.2 Disconnect-Reconnect mode page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
10.2.1 Overview and format of Disconnect-Reconnect mode page for FCP . . . . . . . . . . 69
10.2.2 BUFFER FULL RATIO field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.2.3 BUFFER EMPTY RATIO field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.2.4 BUS INACTIVITY LIMIT field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.2.5 DISCONNECT TIME LIMIT field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
10.2.6 CONNECT TIME LIMIT field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
10.2.7 MAXIMUM BURST SIZE field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
10.2.8 EMDP bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
10.2.9 FAA BIT, FAB BIT, AND FAC bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
10.2.10 FIRST BURST SIZE field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
10.3 Fibre Channel Logical Unit Control mode page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
10.4 Fibre Channel Port Control mode page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
10.4.1 Overview and format of Fibre Channel Port Control mode page. . . . . . . . . . . . . . 73
10.4.2 DISABLE TARGET ORIGINATED LOOP INITIALIZATION (DTOLI) bit. . . . . . . . . . . . . . . . . . 74
10.4.3 DISABLE TARGET INITIATED PORT ENABLE (DTIPE) bit . . . . . . . . . . . . . . . . . . . . . . . . 74
10.4.4 ALLOW LOGIN WITHOUT LOOP INITIALIZATION (ALWLI) bit . . . . . . . . . . . . . . . . . . . . . . 74
10.4.5 REQUIRE HARD ADDRESS (RHA) bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
10.4.6 DISABLE LOOP MASTER (DLM) bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
10.4.7 DISABLE DISCOVERY (DDIS) bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
10.4.8 PREVENT LOOP PORT BYPASS (PLPB) bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
10.4.9 DISABLE TARGET FABRIC DISCOVERY (DTFD) bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
10.4.10 RR_TOV UNITS field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
10.4.11 SEQUENCE INITIATIVE RESOURCE RECOVERY TIMEOUT VALUE (RR_TOVSEQ_INIT) field76
11 Timers for FCP operation and recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
11.1 Summary of timers for the Fibre Channel Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
11.2 Error_Detect Timeout (E_D_TOV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
11.3 Resource Allocation Timeout (R_A_TOV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
11.4 Resource Recovery Timeout (RR_TOV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
11.5 Read Exchange Concise Timeout Value (REC_TOV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
11.6 Upper Level Protocol Timeout (ULP_TOV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
12 Link error detection and error recovery procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
12.1 Error detection and error recovery overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
12.1.1 Exchange level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
12.1.2 Sequence level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
12.2 FCP error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
12.2.1 Overview of FCP-4 error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
12.2.2 FCP-4 error detection using protocol errors for all classes of service . . . . . . . . . . 80
12.2.3 Error detection mechanisms for acknowledged classes of service . . . . . . . . . . . . 81
12.3 Exchange level recovery using ABTS-LS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
12.3.1 ABTS-LS overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
12.3.2 Initiator FCP_Port Exchange termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
12.3.3 Target FCP_Port response to Exchange termination . . . . . . . . . . . . . . . . . . . . . . 82
12.3.4 Additional error recovery by initiator FCP_Port . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12.3.5 Additional error recovery by target FCP_Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12.4 Sequence level error detection and recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12.4.1 Using information from REC ELS to perform Sequence retransmission . . . . . . . . 83
12.4.1.1 Polling Exchange state with REC ELS. . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12.4.1.2 Detection of errors while polling with REC ELS . . . . . . . . . . . . . . . . . . . . 83
12.4.1.3 FCP_CMND IU recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
12.4.1.4 FCP_XFER_RDY IU recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
12.4.1.5 FCP_RSP IU recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
12.4.1.6 FCP_DATA IU recovery - write operations. . . . . . . . . . . . . . . . . . . . . . . . 85

- 5 - ISO/IEC 14776-224:2019 © ISO/IEC 2019
12.4.1.7 FCP_DATA IU recovery - read operations. . . . . . . . . . . . . . . . . . . . . . . . 86
12.4.1.8 FCP_CONF IU recovery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
12.4.2 Additional error recovery requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
12.4.2.1 Error indicated in ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
12.4.2.2 Missing ACK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
12.4.2.3 Distinguishing Exchange to be aborted . . . . . . . . . . . . . . . . . . . . . . . . . . 87
12.5 Second-level error recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
12.5.1 ABTS error recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
12.5.2 REC ELS request error recovery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
12.5.3 SRR FCP_LS request error recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
12.6 Responses to FCP type frames before port login or process login . . . . . . . . . . . . . . . . . . 88
Annex A (normative) SAM-5 mapping to FCP-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Annex B (informative) FCP examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
B.1 Examples of the use of FCP Information Units (IUs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
B.1.1 Overview of examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
B.1.2 Read command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
B.1.3 Write command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
B.1.4 Command with no data transfer or with check condition. . . . . . . . . . . . . . . . . . . . . 92
B.1.5 Read command with multiple FCP_DATA IUs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
B.1.6 Write command with FCP_XFER_RDY disabled . . . . . . . . . . . . . . . . . . . . . . . . . . 93
B.1.7 Bidirectional command with write before read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
B.1.8 Bidirectional command with read before write. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
B.1.9 Bidirectional command with write first and write FCP_XFER_RDY disabled . . . . . 95
B.1.10 Bidirectional command with intermixed writes and reads . . . . . . . . . . . . . . . . . . . 96
B.1.11 Write command with confirmed completion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
B.1.12 Task management function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
B.1.13 Class 2 write command example, frame level. . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
B.1.14 Class 2 read command example, frame level . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Annex C (informative) Error detection and recovery examples . . . . . . . . . . . . . . . . . . . . . . . . 102
Annex D (informative) FCP device discovery procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
D.1 FCP Device Discovery Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
D.1.1 Initiator discovery of Fabric-attached target FCP_Ports . . . . . . . . . . . . . . . . . . . . 136
D.1.2 Initiator discovery of loop-attached target FCP_Ports. . . . . . . . . . . . . . . . . . . . . . 136
D.2 Fabric and device verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
D.3 Logical unit verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Annex E (informative) FCP-4 examples of link service usage. . . . . . . . . . . . . . . . . . . . . . . . . . 138
E.1 Formats for recovery link services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
E.2 Abort Sequence (ABTS) request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
E.2.1 Abort Sequence (ABTS) request fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
E.2.2 Basic Accept (BA_ACC) frame to ABTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
E.2.3 Basic Reject (BA_RJT) frame to ABTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
E.3 Reinstate Recovery Qualifier (RRQ) ELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Tables
Table 1 - Numbering conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 2 - SCSI and Fibre Channel Protocol functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 3 - Discovery of FCP-4 capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 4 - Task management functions, SAM-5 to FCP-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 5 - SCSI Service Response mapping for FCP_CMND delivered task management functions 31
Table 6 - SCSI Service Response mapping for ABORT TASK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 7 - SCSI Service Response mapping for QUERY TASK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 8 - Clearing effects of link related actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 9 - Clearing effects of initiator FCP_Port actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 10 - FCP frame header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 11 - PRLI ELS request FCP Service Parameter page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 12 - PRLI ELS accept FCP Service Parameter page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 13 - FCP TYPE 08h definition of FC-4 Feature bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 14 - Additional FCP Features TYPE 0Ah definition of FC-4 Feature bits . . . . . . . . . . . . . . . . 47
Table 15 - FCP_LS requests and responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 16 - SRR FCP_LS request payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 17 - FCP_ACC payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 18 - FCP_RJT payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 19 - FCP_RJT Reason Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 20 - FCP_RJT Reason Code Explanations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 21 - FCP Information Units (IUs) sent to target FCP_Ports . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 22 - FCP Information Units (IUs) sent to initiator FCP_Ports . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 23 - FCP_CMND IU payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 24 - TASK ATTRIBUTE field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 25 - TASK MANAGEMENT FLAGS field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 26 - FCP_XFER_RDY IU payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Table 27 - FCP_RSP IU payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 28 - FCP_RSP_INFO field format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Table 29 - RSP_CODE field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Table 30 - Mode pages for FCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 31 - Disconnect-Reconnect mode page (02h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Table 32 - Fibre Channel Logical Unit Control mode page (18h) . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 33 - Fibre Channel Port Control mode page (19h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table 34 - Values for RR_TOV UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 35 - Timer summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Table 36 - Initiator FCP_Port REC_TOV usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table 37 - Target FCP_Port REC_TOV usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table A.1 - Mapping of SAM-5 terms to FCP-4 objects and identifiers . . . . . . . . . . . . . . . . . . . . . . 89
Table A.2 - Procedure terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Table B.1 - Read command example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Table B.2 - Write command example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Table B.3 - Command without data transfer example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Table B.4 - Read command with multiple FCP_DATA IUs example . . . . . . . . . . . . . . . . . . . . . . . . 93
Table B.5 - Write command with FCP_XFER_RDY disabled example . . . . . . . . . . . . . . . . . . . . . . 93
Table B.6 - Bidirectional command with write before read example . . . . . . . . . . . . . . . . . . . . . . . . . 94
Table B.7 - Bidirectional command with read before write example . . . . . . . . . . . . . . . . . . . . . . . . . 94
Table B.8 - Bidirectional command with write first and write FC P_XFER_RDY disabled example . 95
Table B.9 - Bidirectional command with intermixed writes and reads example . . . . . . . . . . . . . . . . 96
Table B.10 - Write command with confirmed completion example . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Table B.11 - Task management function example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Table E.1 - ABTS frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Table E.2 - BA_ACC frame to ABTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Table E.3 - BA_RJT frame to ABTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Table E.4 - RRQ ELS request format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

- 7 - ISO/IEC 14776-224:2019 © ISO/IEC 2019
Figures
Figure B.1 - Class 2 write command example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Figure B.2 - Class 2 write data example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Figure B.3 - Class 2 read command example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Figure B.4 - Class 2 read data example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Figure C.1 - Lengthy FCP_CMND or lost ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Figure C.2 - FCP_CMND lost, unacknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Figure C.3 - FCP_CMND lost, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Figure C.4 - FCP_CMND ACK lost, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Figure C.5 - FCP_XFER_RDY lost, unacknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Figure C.6 - FCP_XFER_RDY lost, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Figure C.7 - FCP_XFER_RDY received, ACK lost, acknowledged classes . . . . . . . . . . . . . . . . . . 109
Figure C.8 - FCP_RSP lost, FCP_CONF not requested, unacknowledged classes . . . . . . . . . . . . 110
Figure C.9 - FCP_RSP lost, FCP_CONF not requested, acknowledged classes . . . . . . . . . . . . . . 111
Figure C.10 - FCP_RSP lost read command, no FCP_CONF, acknowledged classes . . . . . . . . . 112
Figure C.11 - FCP_RSP received, ACK lost, acknowledged classes, example 1 . . . . . . . . . . . . . . 113
Figure C.12 - FCP_RSP received, ACK lost, acknowledged classes, example 2 . . . . . . . . . . . . . . 114
Figure C.13 - Lost write data, last frame of Sequence, unacknowledged classes. . . . . . . . . . . . . . 115
Figure C.14 - Lost write data, last frame of Sequence, acknowledged classes. . . . . . . . . . . . . . . . 116
Figure C.15 - Lost write data, not last frame of Sequence, unacknowledged classes. . . . . . . . . . . 117
Figure C.16 - Lost write data, not last frame of Sequence, acknowledged classes. . . . . . . . . . . . . 118
Figure C.17 - Lost read data, last frame of Sequence, unacknowledged classes . . . . . . . . . . . . . . 119
Figure C.18 - Lost read data, last frame of Sequence, acknowledged classes . . . . . . . . . . . . . . . . 120
Figure C.19 - Lost read data, not last frame of Sequence, unacknowledged classes . . . . . . . . . . . 121
Figure C.20 - Lost read data, not last frame of Sequence, acknowledged classes . . . . . . . . . . . . . 122
Figure C.21 - ACK lost on read, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Figure C.22 - ACK lost on write, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Figure C.23 - FCP_CONF lost, unacknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Figure C.24 - FCP_CONF lost, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Figure C.25 - ACK lost on FCP_CONF, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Figure C.26 - REC ELS request or REC ELS response lost, unacknowledged classes . . . . . . . . . 128
Figure C.27 - REC ELS lost, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Figure C.28 - REC ELS response lost, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Figure C.29 - Two REC ELSs lost, unacknowledged classes, abort the original Exchange . . . . . . 131
Figure C.30 - SRR FCP_LS request lost, unacknowledged classes, abort original Exchange . . . . 132
Figure C.31 - SRR FCP_LS response lost, unacknowledged classes . . . . . . . . . . . . . . . . . . . . . . 133
Figure C.32 - SRR FCP_LS request lost, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Figure C.33 - SRR FCP_LS response lost, acknowledged classes . . . . . . . . . . . . . . . . . . . . . . . . 135

INFORMATION TECHNOLOGY –
SMALL COMPUTER SYSTEM INTERFACE (SCSI) –
Part 224: Fibre Channel Protocol, fourth version (FCP-4)
FOREWORD
1) ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC
participate in the development of International Standards through technical committees established by the
respective organization to deal with particular fields of technical activity. ISO and IEC technical committees
collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental,
in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have
established a joint technical committee, ISO/IEC JTC 1.
2) The formal decisions or agreements of IEC and ISO on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested IEC National Committees and ISO member bodies.
3) IEC, ISO and ISO/IEC publications have the form of recommendations for international use and are accepted by
IEC National Committees and ISO member bodies in that sense. While all reasonable efforts are made to ensure
that the technical content of IEC, ISO and ISO/IEC publications is accurate, IEC or ISO cannot be held
responsible for the way in which they are used or for any misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees and ISO member bodies undertake to
apply IEC, ISO and ISO/IEC publications transparently to the maximum extent possible in their national and
regional publications. Any divergence between any ISO, IEC or ISO/IEC publication and the corresponding
national or regional publication should be clearly indicated in the latter.
5) ISO and IEC do not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. ISO or IEC are not responsible for
any services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or ISO or its directors, employees, servants or agents including individual experts
and members of their technical committees and IEC National Committees or ISO member bodies for any personal
injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs
(including legal fees) and expenses arising out of the publication of, use of, or reliance upon, this ISO/IEC
publication or any other IEC, ISO or ISO/IEC publications.
8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this ISO/IEC publication may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 14776-224 was prepared by subcommittee 25: Interconnection
of information technology equipment, of ISO/IEC joint technical committee 1: Information
technology.
The list of all currently available parts of the ISO/IEC 14776 series, under the general title
Information technology – Small computer system interface (SCSI), can be found on the IEC
and ISO websites.
The text for this standard is based on the following document:
CDV Report on voting
JTC1-SC25/2833/CDV JTC1-SC25/2881/RVC
Full information on the voting for the approval of this standard can be found in the report on voting
indicated in the above table.
- 9 - ISO/IEC 14776-224:2019 © ISO/IEC 2019
This publication has been drafted in accordance with the ISO/IE C Directives, Part 2 except as
indicated in 3.4.
A bilingual version of this publication may be issued at a later date.

INTRODUCTION
The Small Computer System Interface (SCSI) command set is widely used and applicable to a wide
variety of device types. The transmission of SCSI command set information across Fibre Channel links
allows the large body of SCSI application and driver software to be successfully used in the high
performance Fibre Channel environment.
This standard describes the protocol for transmitting SCSI commands, data, and status using Fibre
Channel FC-FS-3 Exchanges and Information Units. Fibre Channel is a high speed serial architecture
that allows either optical or electrical connections. The topologies supported by Fibre Channel include
point-to-point, fabric switched, and arbitrated loop. All Fibre Channel connections use the same standard
frame format and standard hierarchy of transmission units to transmit the Information Units that carry
SCSI information.
This standard is divided into the following clauses:
Clause 1 is the scope of this standard.
Clause 2 enumera
...