ISO/IEC 14776-323:2017

ISO/IEC 14776-323
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
colour
inside
Information technology – Small computer system interface (SCSI) –
Part 323: SCSI Block Commands – 3 (SBC-3)

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 Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
ISO/IEC 14776-323
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
colour
inside
Information technology – Small computer system interface (SCSI) –

Part 323: SCSI Block Commands – 3 (SBC-3)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.200 ISBN 978-2-8322-3721-2

– 2 – ISO/IEC 14776-323:2017 © ISO/IEC 2017
– 2 – ISO/IEC 14776-323:2016 © ISO/IEC 2016
FOREWORD . 5
INTRODUCTION . 7
General . 7
SCSI standards family . 7
1 Scope. 8
2 Normative references. 8
3 Terms, definitions, symbols, abbreviations, keywords, and conventions. 9
3.1 Terms and definitions . 9
3.2 Symbols. 19
3.3 Abbreviations. 19
3.4 Keywords. 20
3.5 Editorial conventions . 21
3.6 Numeric and character conventions. 22
3.6.1 Numeric conventions . 22
3.6.2 Units of measure. 22
3.7 State machine conventions . 24
4 Direct access block device type model . 25
4.1 Direct access block device type model introduction. 25
4.2 Direct access block device type model. 26
4.2.1 Direct access block device type model overview. 26
4.2.2 Logical block access command types. 26
4.2.3 Logical block access operation types . 26
4.3 Media examples . 26
4.3.1 Media examples overview. 26
4.3.2 Rotating media. 27
4.3.3 Memory media . 27
4.4 Removable media. 27
4.5 Logical Blocks. 28
4.6 Physical blocks. 29
4.7 Logical block provisioning. 33
4.7.1 Logical block provisioning overview. 33
4.7.2 Fully provisioned logical unit. 34
4.7.3 Logical block provisioning management. 34
4.7.3.1 Logical block provisioning management overview . 34
4.7.3.2 Resource provisioned logical unit. 34
4.7.3.3 Thin provisioned logical unit. 35
4.7.3.4 Unmapping LBAs . 35
4.7.3.4.1 Processing unmap requests . 35
4.7.3.4.2 Unmap operations . 35
4.7.3.4.3 WRITE SAME command and unmap operations . 36
4.7.3.5 Autonomous LBA transitions. 37
4.7.3.6 Thin provisioned logical unit resource exhaustion considerations . 37
4.7.3.7 Logical block provisioning thresholds. 37
4.7.3.7.1 Logical block provisioning thresholds overview. 37
4.7.3.7.2 Logical block provisioning armed decreasing thresholds . 38
4.7.3.7.3 Logical block provisioning armed increasing thresholds. 39
4.7.3.7.4 Logical block provisioning threshold notification.40
4.7.4 LBP (logical block provisioning) state machine. 40
4.7.4.1 LBP state machine overview. 40
4.7.4.2 LBP state machine for thin provisioned logical units supporting anchored LBAs. 41
4.7.4.3 LBP state machine for thin provisioned logical units not supporting anchored LBAs. 41
4.7.4.4 LBP state machine for resource provisioned logical units. 42
4.7.4.5 Performing read operations with respect to logical block provisioning. 42
4.7.4.6 LBP1:Mapped state. 44

ISO/IEC 14776-323:2016 © ISO/IEC 2016 – 3 –
4.7.4.6.1 LBP1:Mapped state description. 44
4.7.4.6.2 Transition LBP1:Mapped to LBP2:Deallocated . 44
4.7.4.6.3 Transition LBP1:Mapped to LBP3:Anchored. 44
4.7.4.7 LBP2:Deallocated state. 44
4.7.4.7.1 LBP2:Deallocated state description. 44
4.7.4.7.2 Transition LBP2:Deallocated to LBP1:Mapped . 44
4.7.4.7.3 Transition LBP2:Deallocated to LBP3:Anchored. 45
4.7.4.8 LBP3:Anchored state . 45
4.7.4.8.1 LBP3:Anchored state description . 45
4.7.4.8.2 Transition LBP3:Anchored to LBP1:Mapped. 45
4.7.4.8.3 Transition LBP3:Anchored to LBP2:Deallocated. 45
4.8 Data de-duplication. 45
4.9 Ready state . 45
4.10 Initialization. 46
4.11 Sanitize operations. 46
4.11.1 Sanitize operations overview . 46
4.11.2 Performing a sanitize operation . 47
4.11.3 Completing a sanitize operation. 48
4.12 Write protection . 49
4.13 Medium defects . 49
4.13.1 Medium defects overview . 49
4.13.2 Generation of defect lists . 52
4.14 Write and unmap failures. 53
4.15 Caches .
...