INTERNATIONAL ISO/IEC STANDARD 14776-452 First edition 2005-08 Information technology - Small computer system interface (Scsl) - Part 452: Primary Commands-2 (SPC-2) IEC ISo Reference number ISO/IEC 14776-452:2005(E) Canvriaht Internatinnal Ornanization fnr Stanardizatin INTERNATIONAL ISO/IEC STANDARD 14776-452 First edition 2005-08 Information technology - Small computer system interface (Scsl) - Part 452: PrimaryCommands-2 (SPC-2) @IS0/IEC2005 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 the publishe ISO/IEC Copyright Office·Case postale 56· CH-1211Geneve 20· Switzerland IEC PRICE CODE XF ISo For price, s Convriaht Intenatinal Ornanizaltion fnr Stanfardizatinn 14776-452@ISO/EC:2005(E) -3 - Contents Page Foreword. 13 Introduction.. .14 1 Scope... .17 2 Normative references.... 17 2.1 General... 17 2.2 Approved references ... 17 2.3 References under development... 17 3 Definitions, symbols, abbreviations, and conventions .. .18 3.1 Definitions... 18 3.2 Acronyms.... .23 3.3 Keywords... 24 3.4 Conventions...... 3.5 Notation for procedures and functions... .26 4 General concepts . .27 4.1 Introduction.. .27 4.2 The request-response model.... 27 4.3 The Command Descriptor Block (CDB), 27 4.3.1 CDB usage and structure . 27 4.3.2The fixed length CDB formats .28 4.3.3 The variable length CDB formats . 30 4.3.4 Common CDB fields ... 31 4.3.4.1Operation code.. 31 4.3.4.2 Service action .. 31 4.3.4.3 Logical block address . 32 4.3.4.4 Transfer length .... 32 4.3.4.5 Parameter list length.. 32 4.3.4.6 Allocation length .. 32 4.3.4.7 Control.... 5 Model common to all device types.... 5.1 Introduction to the model common to all device types.. 33 5.2 Commands implemented by all ScsI device servers..... 33 5.2.1 Summary of commands implemented by all Scsl device servers . 33 5.2 Using the INQUIRY command.... 33 5.2.3 Using the REQUEST SENSE command. 33 5.2.4 Using the TEST UNIT READY command... 33 5.3 Parameter rounding ..... 5.4 Self-test Operations ... 34 5.4.1 Default self-test..... 34 5.4.2Theshortandextendedself-tests .34 5.4.3 Self-test modes... 34 5.4.3.1 Foreground mode ... 34 5.4.3.2 Background mode . 35 5....3 Elements common to foreground and background self-test modes..... 5.5 Reservations... 36 5.5.1 Reservations overview ...... 36 5.5.2 The Reserve/Release management method. .39 5.5.3 The Persistent Reservations management method 40 5.5.3.1OverviewofthePersistentReservations management method... .40 5.5.3.2 Preserving persistent reservations .. 40 5.5.3.3 Finding persistent reservations and reservation keys ...... 41 5.5.3.3.1 Summary of commands for finding persistent reservations and reservation keys. 41 14776-452@ISO/EC:2005(E) -3 - Contents Page Foreword. 13 Introduction.. .14 1 Scope... .17 2 Normative references.... 17 2.1 General... 17 2.2 Approved references ... 17 2.3 References under development... 17 3 Definitions, symbols, abbreviations, and conventions .. .18 3.1 Definitions... 18 3.2 Acronyms.... .23 3.3 Keywords... 24 3.4 Conventions...... 3.5 Notation for procedures and functions... .26 4 General concepts . .27 4.1 Introduction.. .27 4.2 The request-response model.... 27 4.3 The Command Descriptor Block (CDB), 27 4.3.1 CDB usage and structure . 27 4.3.2The fixed length CDB formats .28 4.3.3 The variable length CDB formats . 30 4.3.4 Common CDB fields ... 31 4.3.4.1Operation code.. 31 4.3.4.2 Service action .. 31 4.3.4.3 Logical block address . 32 4.3.4.4 Transfer length .... 32 4.3.4.5 Parameter list length.. 32 4.3.4.6 Allocation length .. 32 4.3.4.7 Control.... 5 Model common to all device types.... 5.1 Introduction to the model common to all device types.. 33 5.2 Commands implemented by all ScsI device servers..... 33 5.2.1 Summary of commands implemented by all Scsl device servers . 33 5.2 Using the INQUIRY command.... 3