ISO/IEC INTERNATIONAL STANDARD 14776-322 First edition 2007-02 Information technology - Small computer system interface (scsl) - Part 322: Block commands-2 (SBC-2) IEC ISO Referencenumber ISO/IEC 14776-322:2007(E) ISO/IEC INTERNATIONAL STANDARD 14776-322 First edition 2007-02 Information technology Small computer system interface (scsl) Part 322: Block commands-2 (SBC-2) Copyright@2007ISO/IEC,Geneva All rights reserved mechanical, including photocopying and'microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varembe, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11Telefax: +41 22 919 03 00E-mail: [email protected]: www.iec.ch EC PRICE CODE XB ISO For price, see current catalogue 3 14776-322@ISO/IEC:2007(E) CONTENTS FOREWORD. 10 INTRODUCTION. 11 1 Scope.. .13 2 Normative references ... 14 2.1 Approved references. 14 2.2 References under development .... 3 Definitions, symbols, abbreviations, keywords, and conventions 15 3.1 Definitions.. 15 3.2 Symbols and abbreviations ... 18 3.4 Conventions.. 19 4 Direct-access block device type model.. .21 4.1 Direct-access block device type model overview.... .21 4.2 Media examples .... .21 4.2.1 Media examples overview... 21 4.2.3 Memory media ... 22 22 4.3.1Removable medium overview. 4.3.2 Removable medium with an attached media changer. 22 4.4 Logical blocks .... 4.5 Ready state .... 23 4.6 Initialization.... 4.7 Write protection 24 4.8 Medium defects.... 25 4.9 Write failures.... .25 4.10 Caches.. 26 4.11 Implicit HEAD OFQUEUE command processing 4..12 Reservation...... 27 4.13 Error reporting ... 29 4.13.1 Error reporting overview.. 29 4.13.2Block commands sensedata descriptor... 30 4.14 Model forXOR commands.... .30 4.14.1ModelforXOR commandsoverview. .30 4.14.2 Storage array controller supervised XOR operations..... 4.14.2.1 Storage array controller supervised XOR operations overview. .31 4.14.2.2 Update write operation .... .31 4.14.2.3 Regenerate operation... 31 4.14.2.4 Rebuild operation.. 32 4.14.3Array subsystem considerations. .32 32 4.14.3.1 Array subsystem considerations overview... 4.14.3.2 Buffer full status handling .... 4.14.3.3 Access to an inconsistent stripe.. .32 4.14.4 XOR data retention requirements.. .33 4.15 START STOP UNIT and power conditions.. 4.15.1START STOP UNIT andpower conditions overview.. 33 4.15.2 START STOP UNIT and power conditions state machine... 4.15.2.1 START STOP UNIT and power conditions state machine overview... .34 4.15.2.2SSU_PC0:Powered_on state.. 35 4.15.2.2.1SSUPC0:Poweredonstatedescription 35 4.15.2.2.2Transition SSU_PC0:Powered_on to SSU_PC1:Active 35 14776-322@ISO/IEC:2007(E) 4 4.15.2.2.3Transition SSU_PC0:Powered_on to SSU_PC4:Stopped. 35 4.15.2.3SSU_PC1:Active state .... .35 4.15.2.3.1 SsU_PC1:Active state description . .35 4.15.2.3.2 Transition SSU_PC1:Active to SSU_PC2:ldle... 4.15.2.3.3 Transition SSU_PC1:Active to SSU_PC3:Standby .35 4.15.2.3.4Transition SSU_PC1:Active to SSU_PC4:Stopped 35 4.15.2.4 SSU_PC2:ldle state ... .35 4.15.2.4.1 SSU_PC2:ldle state description .... .35 4.15.2.4.2 Transition SSU_PC2:ldle to SSU_PC1:Active... 4.15.2.4.3 Transition SSU_PC2:ldle to SSU_PC3:Standby .36 4.15.2.4.4 Transition SSU_PC2:ldle to SSU_PC4:Stopped.... 4.15.2.5 SSU_PC3:Standby state.... .36 4.15.2.5.1 SsU_PC3:Standby state description... .36 .36 4.15.2.5.2Transition SSU_PC3:Standby to SSU_PC1:Active ... 4.15.2.5.3 Transition SSU_PC3:Standby to SSU_PC2:Idle ... .36 4.15.2.5.4Transition SSU_PC3:StandbytoSSU_PC4:Stopped. 4.15.2.6SSU_PC4:Stoppedstate... .37 4.15.2.6.1 SSU_PC4:Stopped state description.... 4.15.2.6.2Transition SSU_PC4:Stopped to SSU_PC1:Active 4.15.2.6.3Transition SSU_PC4:Stopped to SSU_PC2:ldle... 37 4.15.2.6.4 Transition SSU_PC4:Stopped to SSU_PC3:Standby. .37 4.16 Protection information model... 37 4.16.1Protection informationoverview.... 4.16.2 Protection information format.... .38 4.16.3 Logical block guard........ 38 4.16.3.1 Logical block