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Printed Wednesday, July 18, 2001 12:53 PM

dpANS Project

T10/1236-D

Revision 20

18 July 2001

Information technology -

SCSI Primary Commands - 2 (SPC-2)

This is an internal working document of T10, a Technical Committee of Accredited Standards Committee NCITS

(National Committee for Information Technology Standards). As such this is not a completed standard and has not

been approved. The contents may be modified by the T10 Technical Committee. The contents are actively being

modified by T10. This document is made available for review and comment only.

Permission is granted to members of NCITS, its technical committees, and their associated task groups to

reproduce this document for the purposes of NCITS standardization activities without further permission, provided

this notice is included. All other rights are reserved. Any duplication of this document for commercial or for-profit

use is strictly prohibited.

T10 Technical Editor: Ralph O. Weber

ENDL Texas

18484 Preston Road

Suite 102 PMB 178

Dallas, TX 75252

USA

Telephone: 214-912-1373

Facsimile: 972-596-2775

Email: ROWeber@ACM.org

Reference number

ISO/IEC 14776-312 : 200x

ANSI NCITS.351:200x

Published by

American National Standards Institute

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Printed in the United States of America

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Draft

18 July 2001 T10/1236-D Revision 20

dpANS SCSI Primary Commands - 2 (SPC-2) iii

Contents

Page

Foreword................................................................................................................................................................. xiv

Introduction ............................................................................................................................................................. xvi

1 Scope ..................................................................................................................................................................... 1

2 Normative references............................................................................................................................................. 4

2.1 Normative references ................................................................................................................................... 4

2.2 Approved references .................................................................................................................................... 4

2.3 References under development ................................................................................................................... 4

3 Definitions, symbols, abbreviations, and conventions ............................................................................................ 5

3.1 Definitions..................................................................................................................................................... 5

3.2 Acronyms...................................................................................................................................................... 8

3.3 Keywords...................................................................................................................................................... 9

3.4 Conventions................................................................................................................................................ 10

3.5 Notation for procedures and functions........................................................................................................ 11

4 General Concepts ................................................................................................................................................ 12

4.1 Introduction................................................................................................................................................. 12

4.2 The request-response model...................................................................................................................... 12

4.3 The Command Descriptor Block (CDB)...................................................................................................... 12

4.3.1 CDB usage and structure ........................................................................................................................ 12

4.3.2 The fixed length CDB formats ................................................................................................................. 13

4.3.3 The variable length CDB formats ............................................................................................................ 16

4.3.4 Common CDB fields ................................................................................................................................ 17

4.3.4.1 Operation code ..................................................................................................................................... 17

4.3.4.2 Service action ....................................................................................................................................... 17

4.3.4.3 Logical block address ........................................................................................................................... 17

4.3.4.4 Transfer length ..................................................................................................................................... 18

4.3.4.5 Parameter list length............................................................................................................................. 18

4.3.4.6 Allocation length ................................................................................................................................... 18

4.3.4.7 Control .................................................................................................................................................. 18

5 Model common to all device types ....................................................................................................................... 19

5.1 Introduction to the model common to all device types................................................................................ 19

5.2 Commands implemented by all SCSI device servers................................................................................. 19

5.2.1 Summary of commands implemented by all SCSI device servers .......................................................... 19

5.2.2 Using the INQUIRY command................................................................................................................. 19

5.2.3 Using the REQUEST SENSE command ................................................................................................. 19

5.2.4 Using the TEST UNIT READY command................................................................................................ 19

5.3 Parameter rounding.................................................................................................................................... 19

5.4 Self-test Operations.................................................................................................................................... 20

5.4.1 Default self-test........................................................................................................................................ 20

5.4.2 The short and extended self-tests ........................................................................................................... 20

5.4.3 Self-test modes........................................................................................................................................ 20

5.4.3.1 Foreground mode ................................................................................................................................. 21

5.4.3.2 Background mode ................................................................................................................................ 21

5.4.3.3 Elements common to foreground and background self-test modes ..................................................... 22

5.5 Reservations............................................................................................................................................... 23

5.5.1 Reservations overview ............................................................................................................................ 23