ISO/IEC 14776-323:2017

Information technology — Small computer system interface (SCSI) — Part 323: SCSI Block commands — 3 (SBC-3)

ISO/IEC 14776-323:2017, defines the model and command set extensions to be used in conjunction with the SCSI Primary Command Set standard - 4 (SPC-4) to facilitate operation of SCSI direct-access block devices (e.g. hard disk drives).

Technologies de l'information — Interface de petit ordinateur (SCSI) — Partie 323: Titre manque

General Information

• Status: Published
• Publication Date: 30-Jan-2017
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Drafting Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Current Stage: 6060 - International Standard published
• Due Date: 10-Aug-2016
• Completion Date: 31-Jan-2017

Relations

• Revised: ISO/IEC 14776-232:2001 - Information technology — Small computer system interface (SCSI) — Part 232: Serial Bus Protocol 2 (SBP-2)
• Effective Date: 10-May-2014

Standards Content (Sample)

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)

ISO/IEC 14776-323:2017-01(en)

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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



  Warning! Make sure that you obtained this publication from an authorized distributor.

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– 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

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ISO/IEC 14776-323:2017 © ISO/IEC 2017 – 3 –
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 . 53
4.15.1 Caches overview. 53
4.15.2 Read caching. 53
4.15.3 Write caching . 53
4.15.4 Command interactions with caches . 54
4.15.5 Write operation and write medium operation interactions with caches. 54
4.15.6 Read operation and read medium operation interactions with caches . 54
4.15.7 Verify medium operation interactions with caches. 55
4.15.8 Unmap operation interactions with caches . 55
4.15.9 Power loss effects on caches . 55
4.16 Implicit head of queue command processing . 56
4.17 Reservations. 56
4.18 Error reporting . 58
4.18.1 Error reporting overview. 58
4.18.2 Processing pseudo unrecovered errors. 60
4.18.3 Block commands sense data descriptor . 61
4.18.4 User data segment referral sense data descriptor. 62
4.18.5 Direct-access block device sense data descriptor. 64
4.19 Model for XOR commands . 65
4.19.1 Model for XOR commands overview . 65
4.19.2 SCSI storage array device supervised XOR operations. 66
4.19.2.1 SCSI storage array device supervised XOR operations overview . 66
4.19.2.2 Update write operation . 66
4.19.2.3 Regenerate operation. 66
4.19.2.4 Rebuild operation . 67
4.19.3 Array subsystem considerations. 67
4.19.3.1 Array subsystem considerations overview . 67
4.19.3.2 Access to an inconsistent stripe. 67
4.20 Rebuild assist mode . 67
4.20.1 Rebuild assist mode overview . 67
4.20.2 Enabling rebuild assist mode. 68
4.20.3 Using the rebuild assist mode. 68
4.20.3.1 Using rebuild assist mode overview. 68
4.20.3.2 Unpredicted unrecovered read error . 68
4.20.3.3 Predicted unrecovered read error . 69

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– 4 – ISO/IEC 14776-323:2017 © ISO/IEC 2017
– 4 – ISO/IEC 14776-323:2016 © ISO/IEC 2016
4.20.3.4 Unpredicted unrecovered write error. 69
4.20.3.5 Predicted unrecovered write error. 69
4.20.4 Disabling the rebuild assist mode . 70
4.20.5 Testing rebuild assist mode . 70
4.21 START STOP UNIT and power conditions. 70
4.21.1 START STOP UNIT and power conditions overview. 70
4.21.2 Processing of concurrent START STOP UNIT commands. 70
4.21.3 Managing logical block access commands during a change to the active power condition . 71
4.21.4 Stopped power condition . 71
4.21.5 START STOP UNIT and power condition state machine . 71
4.21.5.1 START STOP UNIT and power condition state machine overview. 71
4.21.5.2 SSU_PC0:Powered_On state . 73
4.21.5.2.1 SSU_PC0:Powered_On state description . 73
4.21.5.2.2 Transition SSU_PC0:Powered_On to SSU_PC4:Active_Wait . 74
4.21.5.2.3 Transition SSU_PC0:Powered_On to SSU_PC8:Stopped. 74
4.21.5.3 SSU_PC1:Active state . 74
4.21.5.3.1 SSU_PC1:Active state description . 74
4.21.5.3.2 Transition SSU_PC1:Active to SSU_PC5:Wait_Idle . 74
4.21.5.3.3 Transition SSU_PC1:Active to SSU_PC6:Wait_Standby. 74
4.21.5.3.4 Transition SSU_PC1:Active to SSU_PC10:Wait_Stopped. 75
4.21.5.4 SSU_PC2:Idle state . 75
4.21.5.4.1 SSU_PC2:Idle state description . 75
4.21.5.4.2 Transition SSU_PC2:Idle to SSU_PC4:Active_Wait . 75
4.21.5.4.3 Transition SSU_PC2:Idle to SSU_PC5:Wait_Idle . 75
4.21.5.4.4 Transition SSU_PC2:Idle to SSU_PC6:Wait_Standby. 76
4.21.5.4.5 Transition SSU_PC2:Idle to SSU_PC7:Idle_Wait . 76
4.21.5.4.6 Transition SSU_PC2:Idle to SSU_PC10:Wait_Stopped. 76
4.21.5.5 SSU_PC3:Standby state. 76
4.21.5.5.1 SSU_PC3:Standby state description.76
4.21.5.5.2 Transition SSU_PC3:Standby to SSU_PC4:Active_Wait. 76
4.21.5.5.3 Transition SSU_PC3:Standby to SSU_PC6:Wait_Standby. 77
4.21.5.5.4 Transition SSU_PC3:Standby to SSU_PC7:Idle_Wait. 77
4.21.5.5.5 Transition SSU_PC3:Standby to SSU_PC9:Standby_Wait. 77
4.21.5.5.6 Transition SSU_PC3:Standby to SSU_PC10:Wait_Stopped . 78
4.21.5.6 SSU_PC4:Active_Wait state . 78
4.21.5.6.1 SSU_PC4:Active_Wait state description . 78
4.21.5.6.2 Transition SSU_PC4:Active_Wait to SSU_PC1:Active . 79
4.21.5.7 SSU_PC5:Wait_Idle state . 79
4.21.5.7.1 SSU_PC5:Wait_Idle state description .79
4.21.5.7.2 Transition SSU_PC5:Wait_Idle to SSU_PC2:Idle . 79
4.21.5.8 SSU_PC6:Wait_Standby state. 79
4.21.5.8.1 SSU_PC6:Wait_Standby state description. 79
4.21.5.8.2 Transition SSU_PC6:Wait_Standby to SSU_PC3:Standby. 79
4.21.5.9 SSU_PC7:Idle_Wait state . 79
4.21.5.9.1 SSU_PC7:Idle_Wait state description .79
4.21.5.9.2 Transition SSU_PC7:Idle_Wait to SSU_PC2:Idle . 80
4.21.5.10 SSU_PC8:Stopped state. 80
4.21.5.10.1 SSU_PC8:Stopped state description. 80
4.21.5.10.2 Transition SSU_PC8:Stopped to SSU_PC4:Active_Wait. 80
4.21.5.10.3 Transition SSU_PC8:Stopped to SSU_PC7:Idle_Wait. 81
4.21.5.10.4 Transition SSU_PC8:Stopped to SSU_PC9:Standby_Wait . 81
4.21.5.11 SSU_PC9:Standby_Wait state. 81
4.21.5.11.1 SSU_PC9:Standby_Wait state description. 81
4.21.5.11.2 Transition SSU_PC9:Standby_Wait to SSU_PC3:Standby. 81
4.21.5.12 SSU_PC10:Wait_Stopped state. 82
4.21.5.12.1 SSU_PC10:Wait_Stopped state description. 82
4.21.5.12.2 Transition SSU_PC10:Wait_Stopped to SSU_PC8:Stopped . 82
4.22 Protection information model. 82

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ISO/IEC 14776-323:2017 © ISO/IEC 2017 – 5 –
ISO/IEC 14776-323:2016 © ISO/IEC 2016 – 5 –
4.22.1 Protection information overview. 82
4.22.2 Protection types . 82
4.22.2.1 Protection types overview . 82
4.22.2.2 Type 0 protection. 83
4.22.2.3 Type 1 protection. 84
4.22.2.4 Type 2 protection. 84
4.22.2.5 Type 3 protection. 85
4.22.3 Protection information format. 85
4.22.4 Logical block guard. 89
4.22.4.1 Logical block guard overview . 89
4.22.4.2 CRC generation. 89
4.22.4.3 CRC checking . 90
4.22.4.4 CRC test cases . 90
4.22.5 Application of protection information. 90
4.22.6 Protection information and commands . 91
4.23 Grouping function . 91
4.24 Background scan operations.
...