SCSI Block Commands - SBC-5 Working Draft Explained

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"SCSI Block Commands – 5 (SBC-5) - R0.pdf" SCSI（小型计算机系统接口）是一种广泛应用于存储设备的数据传输协议，它允许不同类型的硬件设备，如硬盘、磁带驱动器、光驱等，与主机系统进行通信。SCSI Block Commands (SBC) 是SCSI协议的一个子集，专门处理块设备操作，如读写数据到存储介质上。SBC-5是这个标准的第五个修订版，它定义了如何在SCSI环境中执行块级命令。 SBC-5 标准草案由美国国家标准协会的 T10 技术委员会负责，该委员会致力于国际信息技术标准的制定。尽管这个文档是工作草案，未被正式批准，但它包含了最新的技术进展和修改建议。T10技术委员会有权对内容进行修改，而此版本仅用于审查和评论目的。只有INCITS（国际信息技术标准委员会）的成员、其下属的技术委员会和任务组可以在参与标准化活动时复制此文档，但必须保留版权通知，且禁止商业用途的复制。文档中的主要关注点可能包括： 1. **命令集扩展**：SBC-5可能会引入新的命令或扩展已有的命令，以适应不断发展的存储技术需求，比如支持更高级别的错误恢复机制、更高效的I/O调度策略等。 2. **性能优化**：可能涉及提高SCSI协议的数据传输速率，减少延迟，以及改进服务质量(QoS)。 3. **安全性增强**：可能涵盖加密和认证机制，以保护存储在块设备上的数据的安全。 4. **错误处理和恢复**：SBC-5可能会细化错误报告和处理机制，提供更强大的错误恢复策略，以确保数据完整性。 5. **设备管理**：可能包含新的设备状态报告和管理功能，使得管理员可以更有效地监控和控制存储设备。 6. **兼容性**：SBC-5将保持向后兼容，确保新标准能够与旧的SCSI设备和软件协同工作。 7. **协议效率**：可能涉及优化协议开销，减少不必要的交换，从而提升整体系统性能。 SBC-5的T10技术编辑是William Martin，来自Samsung Semiconductor, Inc。他负责协调和整理这个标准的编写工作，并处理相关的技术问题和反馈。 ISO/IEC14776-324:20引用号可能指的是与SCSI协议相关的ISO标准，这部分内容可能详细规定了SBC-5的某些技术细节或与其他标准的关联。总而言之，SBC-5是SCSI协议的重要更新，它旨在通过增加新功能、优化现有功能，以适应不断变化的存储技术和市场需求。对于存储设备制造商、操作系统开发者以及数据中心管理者来说，理解和掌握SBC-5的内容至关重要。

T10/BSR INCITS 571 Revision 0 8 April 2021

xvi Working Draft SCSI Block Commands – 5 (SBC-5)

H.3.3.6 SYNCHRONIZE CACHE (16) command.................................................................................. 400

H.3.3.7 WRITE SAME (16) command................................................................................................... 400

H.3.4 SBC Base 2016 feature set mode pages ....................................................................................... 401

H.3.4.1 Mode parameter block descriptor ............................................................................................. 401

H.3.4.2 Caching mode page.................................................................................................................. 401

H.3.4.3 Control mode page ................................................................................................................... 401

H.3.4.4 Informational Exceptions Control mode page........................................................................... 401

H.3.4.5 Read-Write Error Recovery mode page ................................................................................... 401

H.3.5 SBC Base 2016 feature set VPD pages......................................................................................... 401

H.3.5.1 Block Device Characteristics VPD page................................................................................... 401

H.3.5.2 Block Limits VPD page ............................................................................................................. 402

H.3.5.3 Extended INQUIRY Data VPD page......................................................................................... 402

H.4 Basic Provisioning 2016 feature set..................................................................................................... 402

H.4.1 Basic Provisioning 2016 feature set overview................................................................................ 402

H.4.2 SBC Basic Provisioning 2016 feature set model additional requirements ..................................... 403

H.4.3 Basic Provisioning 2016 feature set commands ............................................................................ 403

H.4.3.1 GET LBA STATUS (16) command ........................................................................................... 403

H.4.3.2 READ CAPACITY (16) command............................................................................................. 403

H.4.3.3 WRITE SAME (16) command................................................................................................... 403

H.4.4 SBC Basic Provisioning 2016 feature set VPD pages ................................................................... 403

H.4.4.1 Block Limits VPD page ............................................................................................................. 403

H.4.4.2 Logical Block Provisioning VPD page....................................................................................... 403

H.5 Drive Maintenance 2016 feature set .................................................................................................... 404

H.5.1 Drive Maintenance 2016 feature set overview ............................................................................... 404

H.5.2 Drive Maintenance 2016 feature set commands............................................................................ 405

H.5.2.1 READ BUFFER (10) command ................................................................................................ 405

H.5.2.2 READ DEFECT DATA (12) command...................................................................................... 405

H.5.2.3 REASSIGN BLOCKS command............................................................................................... 405

H.5.2.4 SANITIZE command................................................................................................................. 405

H.5.2.5 SEND DIAGNOSTIC command................................................................................................ 406

H.5.2.6 WRITE BUFFER command ...................................................................................................... 406

H.5.3 Drive Maintenance 2016 feature set VPD pages ........................................................................... 406

H.5.3.1 Block Device characteristics VPD page.................................................................................... 406

H.5.4 Drive Maintenance 2016 feature set log pages.............................................................................. 406

H.5.4.1 Background Scan Results log page.......................................................................................... 406

H.5.4.2 Read Error Counters log page.................................................................................................. 406

H.5.4.3 Start-Stop Cycle Counter log page ........................................................................................... 407

H.5.4.4 Temperature log page .............................................................................................................. 407

Annex I (informative) Using storage element depopulation .......................................................................... 408

Annex J (informative) Rebuild assist using the GET LBA STATUS command ............................................. 409

J.1 Overview............................................................................................................................................... 409

J.2 Discovery process ................................................................................................................................ 409

Annex K (informative) Direct access block devices with shared resources .................................................. 411

K.1 Overview .............................................................................................................................................. 411

K.2 Downloading and activating microcode................................................................................................ 411

K.3 Caching ................................................................................................................................................ 411

K.4 Power management ............................................................................................................................. 411

K.5 Mode page considerations ................................................................................................................... 412

K.6 Log page considerations ...................................................................................................................... 412

K.7 Command considerations .................................................................................................................... 413

K.8 Commands with a high probability of affecting more than one logical unit .......................................... 413

K.8.1 The FORMAT UNIT command ....................................................................................................... 413

K.8.2 The REMOVE ELEMENT AND TRUNCATE command................................................................. 413

K.8.3 The SANITIZE command ............................................................................................................... 414

T10/BSR INCITS 571 Revision 0 8 April 2021

xviii Working Draft SCSI Block Commands – 5 (SBC-5)

Tables

Page

Table 1 — Direct access block device type mode topics and references ........................................................ 2

Table 2 — Numbering convention examples ................................................................................................. 15

Table 3 — Comparison of decimal prefixes and binary prefixes .................................................................... 16

Table 4 — Direct access block device type model topics .............................................................................. 17

Table 5 — Logical block provisioning states supported by logical block provisioning type ............................ 26

Table 6 — WRITE SAME command and unmap operations ......................................................................... 29

Table 7 — Threshold resource value, threshold type value, and threshold arming value for logical block

provisioning thresholds ............................................................................................................................... 32

Table 8 — Threshold resource value, threshold type value, and threshold arming value for logical block

provisioning percentages ........................................................................................................................... 33

Table 9 — Logical block data returned by a read operation from a mapped LBA ......................................... 37

Table 10 — Logical block data returned by a read operation from an unmapped LBA ................................. 38

Table 11 — Defect lists (i.e., PLIST and GLIST) ........................................................................................... 46

Table 12 — Address descriptor formats ......................................................................................................... 47

Table 13 — SBC-4 commands that are allowed in the presence of various reservations ............................. 52

Table 14 — Example error conditions ............................................................................................................ 55

Table 15 — Sense data field usage for direct access block devices ............................................................. 56

Table 16 — Block commands sense data descriptor format .......................................................................... 57

Table 17 — User data segment referral sense data descriptor format .......................................................... 58

Table 18 — User data segment referral descriptor format ............................................................................. 59

Table 19 — Target port group descriptor ....................................................................................................... 60

Table 20 — Direct access block device sense data descriptor format ........................................................... 60

Table 21 — Summary of states in the SSU_PC state machine ..................................................................... 65

Table 22 — Logical block data format with a single protection information interval ....................................... 80

Table 23 — An example of the logical block data for a logical block with more than one protection

information interval ..................................................................................................................................... 81

Table 24 — Content of the first

LOGICAL BLOCK REFERENCE TAG field ............................................................. 83

Table 25 — Content of subsequent LOGICAL BLOCK REFERENCE TAG fields for a logical block in the Data-In

Buffer and/or Data-Out Buffer .................................................................................................................... 83

Table 26 — CRC polynomials ........................................................................................................................ 84

Table 27 — CRC test cases ........................................................................................................................... 85

Table 28 — Commands that require uninterrupted sequences ..................................................................... 92

Table 29 — Performing an ORWRITE set operation ..................................................................................... 97

Table 30 — ROD token type values ............................................................................................................. 100

Table 31 — Block device zero ROD token format ....................................................................................... 100

Table 32 — Performing atomic write operations with overlapping LBAs during current operations ............ 103

Table 33 — Transfer limits for commands ................................................................................................... 112

Table 34 — Commands for direct access block devices ............................................................................. 120

Table 35 — BACKGROUND CONTROL command .................................................................................... 124

Table 36 —

BO_CTL field .............................................................................................................................. 125

Table 37 — COMPARE AND WRITE command ......................................................................................... 126

Table 38 — FORMAT UNIT command ........................................................................................................ 127

Table 39 — FORMAT UNIT command address descriptor support requirements ....................................... 128

Table 40 —

FFMT field description ................................................................................................................ 129

Table 41 — FORMAT UNIT parameter list .................................................................................................. 129

Table 42 — Short parameter list header ...................................................................................................... 130

Table 43 — Long parameter list header ....................................................................................................... 130

Table 44 —

FMTPINFO field and PROTECTION FIELD USAGE field ..................................................................... 131

Table 45 — Initialization pattern descriptor .................................................................................................. 134

Table 46 —

INITIALIZATION PATTERN TYPE field .............................................................................................. 135

Table 47 — FORMAT WITH PRESET command ........................................................................................ 136

Table 48 — GET LBA STATUS (16) command ........................................................................................... 137

Table 49 —

REPORT TYPE field ..................................................................................................................... 138

Table 50 — GET LBA STATUS parameter data .......................................................................................... 138

8 April 2021 T10/BSR INCITS 571 Revision 0

Working Draft SCSI Block Commands – 5 (SBC-5) xix

Table 51 —

COMPLETION CONDITION field ...................................................................................................... 139

Table 52 — LBA status descriptor format .................................................................................................... 140

Table 53 —

PROVISIONING STATUS field ......................................................................................................... 140

Table 54 —

ADDITIONAL STATUS field ............................................................................................................ 141

Table 55 — GET LBA STATUS (32) command ........................................................................................... 142

Table 56 — GET PHYSICAL ELEMENT STATUS command ..................................................................... 143

Table 57 —

FILTER field ................................................................................................................................ 144

Table 58 —

REPORT TYPE field ..................................................................................................................... 144

Table 59 — GET PHYSICAL ELEMENT STATUS parameter data ............................................................. 145

Table 60 — Physical element status descriptor format ................................................................................ 146

Table 61 —

PHYSICAL ELEMENT TYPE field ..................................................................................................... 146

Table 62 —

PHYSICAL ELEMENT HEALTH field ................................................................................................. 147

Table 63 — GET STREAM STATUS command .......................................................................................... 148

Table 64 — GET STREAM STATUS parameter data .................................................................................. 149

Table 65 — Stream status descriptor format ............................................................................................... 150

Table 66 — ORWRITE (16) command ........................................................................................................ 151

Table 67 —

ORPROTECT field - checking protection information from the read operations ........................... 152

Table 68 — ORPROTECT field - checking protection information from the Data-Out Buffer ........................... 155

Table 69 — ORWRITE (32) command ........................................................................................................ 157

Table 70 —

BMOP field .................................................................................................................................. 158

Table 71 — POPULATE TOKEN command ................................................................................................ 159

Table 72 — POPULATE TOKEN parameter list .......................................................................................... 160

Table 73 — Block device range descriptor .................................................................................................. 162

Table 74 — PRE-FETCH (10) command ..................................................................................................... 163

Table 75 — PRE-FETCH (16) command ..................................................................................................... 164

Table 76 — PREVENT ALLOW MEDIUM REMOVAL command ................................................................ 165

Table 77 —

PREVENT field ............................................................................................................................ 165

Table 78 — READ (10) command ............................................................................................................... 166

Table 79 — RDPROTECT field ........................................................................................................................ 167

Table 80 — READ (12) command ............................................................................................................... 171

Table 81 — READ (16) command ............................................................................................................... 172

Table 82 — Duration limit descriptor

DLD bits .............................................................................................. 172

Table 83 — READ (32) command ............................................................................................................... 173

Table 84 — READ CAPACITY (10) command ............................................................................................ 175

Table 85 — READ CAPACITY (10) parameter data .................................................................................... 175

Table 86 — READ CAPACITY (16) command ............................................................................................ 176

Table 87 — READ CAPACITY (16) parameter data .................................................................................... 177

Table 88 —

P_TYPE field and PROT_EN bit .................................................................................................... 177

Table 89 —

LOGICAL BLOCKS PER PHYSICAL BLOCK EXPONENT field ............................................................... 178

Table 90 — READ DEFECT DATA (10) command ..................................................................................... 179

Table 91 — REQ_PLIST bit and REQ_GLIST bit ............................................................................................... 179

Table 92 — READ DEFECT DATA (10) parameter data ............................................................................. 180

Table 93 — READ DEFECT DATA (12) command ..................................................................................... 181

Table 94 — READ DEFECT DATA (12) parameter data ............................................................................. 182

Table 95 — REASSIGN BLOCKS command ............................................................................................... 184

Table 96 — REASSIGN BLOCKS parameter list ......................................................................................... 184

Table 97 — REASSIGN BLOCKS short parameter list header ................................................................... 185

Table 98 — REASSIGN BLOCKS long parameter list header ..................................................................... 185

Table 99 — Reassign LBA if the

LONGLBA bit is set to zero ......................................................................... 185

Table 100 — Reassign LBA if the LONGLBA bit is set to one ........................................................................ 186

Table 101 — RECEIVE ROD TOKEN INFORMATION reference ............................................................... 187

Table 102 — RECEIVE ROD TOKEN INFORMATION parameter data for POPULATE TOKEN ............... 188

Table 103 — RECEIVE ROD TOKEN INFORMATION parameter data for WRITE USING TOKEN .......... 190

Table 104 — REMOVE ELEMENT AND TRUNCATE command ................................................................ 191

Table 105 — REPORT PROVISIONING INITIALIZATION PATTERN command ....................................... 192

Table 106 — REPORT REFERRALS command ......................................................................................... 193

Table 107 — REPORT REFERRALS parameter data ................................................................................. 194

T10/BSR INCITS 571 Revision 0 8 April 2021

xx Working Draft SCSI Block Commands – 5 (SBC-5)

Table 108 — RESTORE ELEMENTS AND REBUILD command ................................................................ 195

Table 109 — SANITIZE command ............................................................................................................... 196

Table 110 — SANITIZE service action codes .............................................................................................. 197

Table 111 — OVERWRITE service action parameter list ............................................................................ 198

Table 112 —

TEST field ................................................................................................................................. 198

Table 113 — START STOP UNIT command ............................................................................................... 200

Table 114 — POWER CONDITION and POWER CONDITION MODIFIER field ......................................................... 201

Table 115 — STREAM CONTROL command ............................................................................................. 204

Table 116 —

STR_CTL field ........................................................................................................................... 204

Table 117 — STREAM CONTROL parameter data ..................................................................................... 205

Table 118 — SYNCHRONIZE CACHE (10) command ................................................................................ 206

Table 119 — SYNCHRONIZE CACHE (16) command ................................................................................ 207

Table 120 — UNMAP command .................................................................................................................. 208

Table 121 — UNMAP parameter list ............................................................................................................ 209

Table 122 — UNMAP block descriptor ........................................................................................................ 210

Table 123 — Data-Out Buffer contents for the VERIFY (10) command ...................................................... 211

Table 124 — VERIFY (10) command .......................................................................................................... 211

Table 125 —

VRPROTECT field with the BYTCHK field set to 00b – checking protection information from the

verify operations ....................................................................................................................................... 213

Table 126 —

VRPROTECT field with the BYTCHK field set to 01b or 11b – checking protection information

from the verify operations ......................................................................................................................... 216

Table 127 —

VRPROTECT field with the BYTCHK field set to 01b or 11b – checking protection information

from the Data-Out Buffer .......................................................................................................................... 218

Table 128 —

VRPROTECT field with the BYTCHK field set to 01b or 11b – compare operation requirements . 220

Table 129 — VERIFY (12) command .......................................................................................................... 224

Table 130 — VERIFY (16) command .......................................................................................................... 225

Table 131 — VERIFY (32) command .......................................................................................................... 226

Table 132 — WRITE (10) command ............................................................................................................ 227

Table 133 —

WRPROTECT field ..................................................................................................................... 228

Table 134 — WRITE (12) command ............................................................................................................ 231

Table 135 — WRITE (16) command ............................................................................................................ 232

Table 136 — WRITE (32) command ............................................................................................................ 233

Table 137 — WRITE AND VERIFY (10) command ..................................................................................... 234

Table 138 — WRITE AND VERIFY (12) command ..................................................................................... 235

Table 139 — WRITE AND VERIFY (16) command ..................................................................................... 236

Table 140 — WRITE AND VERIFY (32) command ..................................................................................... 237

Table 141 — WRITE ATOMIC (16) command ............................................................................................. 238

Table 142 — WRITE ATOMIC (32) command ............................................................................................. 239

Table 143 — WRITE LONG (10) command ................................................................................................. 240

Table 144 —

WR_UNCOR bit ......................................................................................................................... 240

Table 145 — WRITE LONG (16) command ................................................................................................. 241

Table 146 — WRITE SAME (10) command ................................................................................................. 243

Table 147 —

UNMAP bit, ANCHOR bit, and ANC_SUP bit relationships ............................................................ 243

Table 148 — WRITE SAME (16) command ................................................................................................. 244

Table 149 — WRITE SAME (32) command ................................................................................................. 246

Table 150 — WRITE SCATTERED (16) command ..................................................................................... 247

Table 151 — Data-Out Buffer contents for the WRITE SCATTERED (16) command ................................. 249

Table 152 — LBA range descriptor .............................................................................................................. 250

Table 153 — WRITE SCATTERED (32) command ..................................................................................... 251

Table 154 — Data-Out Buffer contents for the WRITE SCATTERED (32) command ................................. 252

Table 155 — LBA range descriptor .............................................................................................................. 253

Table 156 — WRITE STREAM (16) command ............................................................................................ 254

Table 157 — WRITE STREAM (32) command ............................................................................................ 255

Table 158 — WRITE USING TOKEN command ......................................................................................... 256

Table 159 — WRITE USING TOKEN parameter list ................................................................................... 257

Table 160 — Parameters for direct access block devices ........................................................................... 260

Table 161 — Address descriptors ................................................................................................................ 261

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