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)
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Reference number
ISO/IEC 14776-312 : 200x
ANSI NCITS.351:200x
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ANSI (r)
NCITS.351:200x
American National Standards
for Information Systems -
SCSI Primary Commands - 2 (SPC-2)
Secretariat
National Committee for Information Technology Standards
Approved mm dd yy
American National Standards Institute, Inc.
Abstract
This standard defines the device model for all SCSI devices. This standard defines the SCSI commands that are
basic to every device model and the SCSI commands that may apply to any device model.
The processor device model is defined in this standard. Some target SCSI devices may implement an initiator
subset of the processor device model to support the Asynchronous Event Reporting capability defined in the
SCSI-3 Architecture Model.
Draft
Draft
Published by
American National Standards Institute
11 West 42nd Street, New York, NY 10036
Copyright 199n by American National Standards Institute
All rights reserved.
Printed in the United States of America
American
National
Standard
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As of the date of publication of this standard and following calls for the identification of patents that may be
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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
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