seagate SCSI Commands manual
SCSI Commands Reference Manual
Parallel SCSI
Fibre Channel (FC)
Serial Attached SCSI (SAS)
Rev. A
SCSI Commands Reference Manual
Parallel SCSI
Fibre Channel (FC)
Serial Attached SCSI (SAS)
Rev. A
©2006, Seagate Technology LLC All rights reserved
Publication number: 100293068, Rev. A
February 2006
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Revision status summary sheet
Revision Date Sheets Affected
Rev. A 02/14/06 All.
SCSI Commands Reference Manual, Rev. A iii
iv SCSI Commands Reference Manual, Rev. A
Table of Contents
Table of Contents .............................................................................................................................. v
List of Tables .................................................................................................................................... xi
1.0 Definitions, symbols, abbreviations, keywords, and conventions .............................................. 1
1.1 Definitions .................................................................................................................................... 2
1.2 Symbols and abbreviations ........................................................................................................ 12
1.3 Keywords ................................................................................................................................... 14
1.4 Conventions ............................................................................................................................... 15
2.0 General Concepts ........................................................................................................................... 17
2.1 Command Descriptor Block (CDB) ............................................................................................ 18
2.1.1 CDB usage and structure ............................................................................................... 18
2.1.2 The fixed length CDB formats ......................................................................................... 18
2.1.3 The variable length CDB formats .................................................................................... 22
2.2 Common CDB fields .................................................................................................................. 24
2.2.1 Operation Code .............................................................................................................. 24
2.2.2 Service action ................................................................................................................. 24
2.2.3 Logical block address ..................................................................................................... 24
2.2.4 Transfer length ................................................................................................................ 25
2.2.5 Parameter list length ....................................................................................................... 25
2.2.6 Allocation length ............................................................................................................. 25
2.2.7 Control ............................................................................................................................ 26
2.2.8 Grouping function ........................................................................................................... 27
2.3 Parameter rounding ................................................................................................................... 28
2.4 Sense data ................................................................................................................................. 29
2.4.1 Sense data introduction .................................................................................................. 29
2.4.1.1 Descriptor format sense data ............................................................................. 30
2.4.1.1.1 Descriptor format sense data overview ........................................................ 30
2.4.1.1.2 Information sense data descriptor ................................................................ 32
2.4.1.1.3 Command-specific information sense data descriptor ................................. 33
2.4.1.1.4 Sense key specific sense data descriptor .................................................... 34
2.4.1.1.5 Field replaceable unit sense data descriptor ............................................... 38
2.4.1.1.6 Vendor specific sense data descriptors ....................................................... 38
2.4.1.2 Fixed format sense data .................................................................................... 39
2.4.1.3 Current errors ..................................................................................................... 40
2.4.1.4 Deferred errors ................................................................................................... 40
2.4.1.5 Sense key and sense code definitions ............................................................... 42
2.4.1.6 Additional Sense and Additional Sense Qualifier codes .................................... 43
3.0 Command Reference ...................................................................................................................... 51
3.1 CHANGE DEFINITION command ............................................................................................. 54
3.2 COMPARE command ................................................................................................................ 56
3.3 COPY command ........................................................................................................................ 56
3.4 COPY AND VERIFY command ................................................................................................. 56
3.5 FORMAT UNIT command ......................................................................................................... 57
SCSI Commands Reference Manual, Rev. A v
3.5.1 FORMAT UNIT command overview ................................................................................57
3.5.2 FORMAT UNIT parameter list .........................................................................................60
3.5.2.1 FORMAT UNIT parameter list overview .............................................................60
3.5.3 Parameter list header ......................................................................................................60
3.5.4 Initialization pattern descriptor ........................................................................................64
3.5.5 Address descriptor formats .............................................................................................66
3.5.5.1 Address descriptor formats overview .................................................................66
3.5.5.2 Short block format address descriptor ................................................................67
3.5.5.3 Long block format address descriptor ................................................................67
3.5.5.4 Bytes from index format address descriptor .......................................................68
3.5.5.5 Physical sector format address descriptor ..........................................................69
3.6 INQUIRY command ...................................................................................................................70
3.6.1 INQUIRY command introduction .....................................................................................70
3.6.2 Standard INQUIRY data ..................................................................................................72
3.6.3 SCSI Parallel Interface specific INQUIRY data ...............................................................78
3.6.4 Vital product data ............................................................................................................79
3.7 LOCK-UNLOCK Cache (10) command ......................................................................................80
3.8 LOCK-UNLOCK Cache (16) command ......................................................................................80
3.9 LOG SELECT command ............................................................................................................81
3.10 LOG SENSE command ..............................................................................................................84
3.11 MODE SELECT(6) command ....................................................................................................86
3.12 MODE SELECT(10) command ..................................................................................................88
3.13 MODE SENSE(6) command ......................................................................................................89
3.13.1 MODE SENSE(6) command introduction .......................................................................89
3.13.1.1 Current values ....................................................................................................90
3.13.1.2 Changeable values .............................................................................................91
3.13.1.3 Default values .....................................................................................................91
3.13.1.4 Saved values ......................................................................................................91
3.13.1.5 Initial responses ..................................................................................................91
3.14 MODE SENSE(10) command ....................................................................................................92
3.15 PERSISTENT RESERVE IN command .....................................................................................93
3.15.1 PERSISTENT RESERVE IN command introduction ......................................................93
3.15.2 READ KEYS service action .............................................................................................93
3.15.3 READ RESERVATION service action ............................................................................94
3.15.3.1 READ RESERVATION service action introduction ............................................94
3.15.3.2 PERSISTENT RESERVE IN parameter data for READ RESERVATION ..........94
3.15.3.3 Persistent reservations scope ............................................................................96
3.15.3.4 Persistent reservations type ...............................................................................97
3.15.4 REPORT CAPABILITIES service action .........................................................................97
3.15.5 READ FULL STATUS service action ............................................................................100
3.16 PERSISTENT RESERVE OUT command ...............................................................................103
3.16.1 PERSISTENT RESERVE OUT command introduction ................................................103
3.16.2 PERSISTENT RESERVE OUT service actions ............................................................104
3.16.3 Basic PERSISTENT RESERVE OUT parameter list ....................................................105
3.16.4 PERSISTENT RESERVE OUT command with REGISTER AND MOVE service .........108
3.17 PRE-FETCH (10) command, PRE-FETCH (16) command ......................................................110
3.18 PREVENT ALLOW MEDIUM REMOVAL command ................................................................110
3.19 READ (6) command .................................................................................................................111
3.20 READ (10) command ...............................................................................................................113
3.21 READ (12) command ...............................................................................................................118
3.22 READ (16) command ...............................................................................................................119
3.23 READ (32) command ...............................................................................................................120
3.24 READ BUFFER command .......................................................................................................122
3.24.1 READ BUFFER command introduction ........................................................................122
3.24.1.1 Vendor specific mode (01h) ..............................................................................123
vi SCSI Commands Reference Manual, Rev. A
3.24.1.2 Data mode (02h) .............................................................................................. 123
3.24.1.3 Descriptor mode (03h) ..................................................................................... 123
3.24.1.4 Echo buffer mode (0Ah) ................................................................................... 124
3.24.1.5 Echo buffer descriptor mode (0Bh) .................................................................. 125
3.24.1.6 Enable expander communications protocol and Echo buffer (1Ah) ................. 125
3.25 READ CAPACITY (10) command ............................................................................................126
3.25.1 READ CAPACITY (10) overview .................................................................................. 126
3.25.2 READ CAPACITY (10) parameter data ........................................................................ 127
3.26 READ CAPACITY (16) command ............................................................................................128
3.26.1 READ CAPACITY (16) command overview ................................................................. 128
3.26.2 READ CAPACITY (16) parameter data ........................................................................ 129
3.27 READ DEFECT DATA (10) command ..................................................................................... 130
3.27.1 READ DEFECT DATA (10) command overview .......................................................... 130
3.27.2 READ DEFECT DATA (10) parameter data ................................................................. 131
3.28 READ DEFECT DATA (12) command ..................................................................................... 133
3.29 READ LONG (10) command ................................................................................................... 135
3.30 READ LONG (16) command ................................................................................................... 136
3.31 REASSIGN BLOCKS command .............................................................................................. 137
3.31.1 REASSIGN BLOCKS command overview .................................................................... 137
3.31.2 REASSIGN BLOCKS parameter list ............................................................................. 138
3.32 RECEIVE DIAGNOSTIC RESULTS command ....................................................................... 140
3.33 RELEASE(6) command ........................................................................................................... 143
3.34 RELEASE (10) command ........................................................................................................ 144
3.34.1 RELEASE(10) command introduction .......................................................................... 144
3.34.2 Logical unit release ....................................................................................................... 144
3.34.3 Third-party release ........................................................................................................ 144
3.35 REPORT DEVICE IDENTIFIER command .............................................................................. 146
3.36 REPORT LUNS command ...................................................................................................... 148
3.37 REQUEST SENSE command .................................................................................................151
3.37.1 Sense Key Specific field ............................................................................................... 155
3.38 RESERVE(6) command .......................................................................................................... 158
3.39 RESERVE (10) command ....................................................................................................... 159
3.39.1 RESERVE (10) command introduction ......................................................................... 159
3.39.2 Logical unit reservation ................................................................................................ 159
3.39.3 Third-party reservation .................................................................................................. 160
3.39.4 Superseding reservations ............................................................................................. 160
3.40 REZERO UNIT command ........................................................................................................ 162
3.41 SEEK command ...................................................................................................................... 163
3.42 SEEK EXTENDED command .................................................................................................. 164
3.43 SEND DIAGNOSTIC command ...............................................................................................165
3.44 SET DEVICE IDENTIFIER command ...................................................................................... 168
3.45 START STOP UNIT command ................................................................................................ 170
3.46 SYNCHRONIZE CACHE (10) command ................................................................................. 172
3.47 SYNCHRONIZE CACHE (16) command ................................................................................. 173
3.48 TEST UNIT READY command ................................................................................................ 174
3.49 VERIFY (10) command ............................................................................................................ 175
3.50 VERIFY (12) command ............................................................................................................ 185
3.51 VERIFY (16) command ............................................................................................................ 186
3.52 VERIFY (32) command ............................................................................................................ 187
3.53 WRITE (6) command ............................................................................................................... 189
3.54 WRITE (10) command ............................................................................................................. 190
3.55 WRITE (12) command ............................................................................................................. 194
3.56 WRITE (16) command ............................................................................................................. 195
3.57 WRITE (32) command ............................................................................................................. 196
3.58 WRITE AND VERIFY (10) command ...................................................................................... 198
SCSI Commands Reference Manual, Rev. A vii
3.59 WRITE AND VERIFY (12) command .......................................................................................199
3.60 WRITE AND VERIFY (16) command .......................................................................................200
3.61 WRITE AND VERIFY (32) command .......................................................................................201
3.62 WRITE BUFFER command .....................................................................................................203
3.62.1 WRITE BUFFER command introduction .......................................................................203
3.62.2 Combined header and data mode (00h) .......................................................................204
3.62.3 Vendor specific mode (01h) ..........................................................................................204
3.62.4 Data mode (02h) ...........................................................................................................204
3.62.5 Download microcode mode (04h) .................................................................................205
3.62.6 Download microcode and save mode (05h) ..................................................................205
3.62.7 Download microcode with offsets mode (06h) ..............................................................205
3.62.8 Download microcode with offsets and save mode (07h) ...............................................206
3.62.9 Write data to echo buffer mode (0Ah) ...........................................................................207
3.62.10 Enable expander communications protocol and Echo buffer mode (1Ah) ....................207
3.62.11 Disable expander communications protocol mode (1Bh) ..............................................207
3.62.12 Download application log mode (1Ch) ..........................................................................207
3.63 WRITE LONG (10) command ..................................................................................................211
3.64 WRITE LONG (16) command ..................................................................................................212
3.65 WRITE SAME (10) command ..................................................................................................213
3.66 WRITE SAME (16) command ..................................................................................................215
3.67 WRITE SAME (32) command ..................................................................................................216
4.0 Parameters for all device types ....................................................................................................219
4.1 Diagnostic parameters .............................................................................................................220
4.1.1 Diagnostic page format and page codes for all device types ........................................220
4.1.2 Supported diagnostic pages (00h) ................................................................................221
4.1.3 Translate Address page (40h) .......................................................................................222
4.1.4 SCSI Enclosure Services pages (01h - 2Fh) ................................................................224
4.2 Log parameters ........................................................................................................................225
4.2.1 Log page structure and page codes for all device types ...............................................225
4.2.2 Application Client log page (0Fh) ..................................................................................230
4.2.3 Background Scan Results log page (15h) .....................................................................232
4.2.3.1 Medium Scan Parameter ..................................................................................235
4.2.4 Cache Statistics page (37h) ..........................................................................................237
4.2.5 Error counter log pages (WRITE, READ, and VERIFY, 02h, 03h, and 05h) .................237
4.2.6 Factory Log page (3Eh) ................................................................................................239
4.2.7 Informational Exceptions log page (2Fh) ......................................................................239
4.2.8 Non-Medium Error log page (06h) ................................................................................241
4.2.9 Self-Test Results log page (10h) ...................................................................................242
4.2.10 Start-Stop Cycle Counter log page (0Eh) ......................................................................245
4.2.11 Supported Log Pages log page (00h) ...........................................................................248
4.2.12 Temperature log page (0Dh) .........................................................................................249
4.3 Mode parameters .....................................................................................................................251
4.3.1 Mode parameters overview ...........................................................................................251
4.3.2 Mode parameter list format ...........................................................................................251
4.3.3 Mode parameter header formats ...................................................................................251
4.3.4 Mode parameter block descriptor formats .....................................................................253
4.3.4.1 General block descriptor format .......................................................................253
4.3.5 Mode page and subpage formats and page codes .......................................................254
4.3.6 Mode parameter block descriptors ................................................................................256
4.3.6.1 Mode parameter block descriptors overview ....................................................256
4.3.6.2 Short LBA mode parameter block descriptor ....................................................257
4.3.6.3 Long LBA mode parameter block descriptor ....................................................258
4.3.7 Background Control mode page (1Ch) .........................................................................260
4.3.8 Caching Parameters page (08h) ...................................................................................261
viii SCSI Commands Reference Manual, Rev. A
4.3.9 Control mode page (0Ah) ............................................................................................. 264
4.3.10 Control Extension mode page (0Ah) .............................................................................269
4.3.11 Disconnect-Reconnect mode page (02h) ..................................................................... 270
4.3.11.1 Disconnect-Reconnect mode page for Parallel SCSI ...................................... 270
4.3.11.2 Disconnect-Reconnect mode page for FCP (02h) ........................................... 273
4.3.11.2.1 Overview and format of Disconnect-Reconnect mode page for FCP ........ 273
4.3.11.3 Disconnect-Reconnect mode page for SAS (02h) ........................................... 275
4.3.11.3.1 Disconnect-Reconnect mode page overview ............................................. 275
4.3.12 Format Parameters page (03h) .................................................................................... 278
4.3.13 Informational Exceptions Control mode page (1Ch) ..................................................... 280
4.3.14 Notch page (0Ch) ......................................................................................................... 283
4.3.15 Power Condition mode page (1Ah) ...............................................................................285
4.3.16 Read-Write Error Recovery mode page (01h) .............................................................. 287
4.3.17 Protocol Specific Logical Unit mode page (18h) ........................................................... 293
4.3.17.1 Protocol specific parameters ............................................................................ 293
4.3.17.1.1 Protocol specific parameters introduction .................................................. 293
4.3.17.2 Fibre Channel Logical Unit Control mode page (18h) ...................................... 295
4.3.17.3 SAS Protocol-Specific Logical Unit mode page ............................................... 296
4.3.17.3.1 Protocol-Specific Logical Unit mode page - short format (18h) ................. 296
4.3.18 Protocol Specific Port mode page (19h) ....................................................................... 297
4.3.18.1 Port Control Mode page (19h) for Parallel SCSI .............................................. 298
4.3.18.1.1 Margin control subpage .............................................................................300
4.3.18.1.2 Saved training configuration values subpage ............................................ 302
4.3.18.1.3 Negotiated settings subpage ..................................................................... 304
4.3.18.1.4 Report transfer capabilities subpage ........................................................ 305
4.3.18.2 Port Control Mode page (19h) for Fibre Channel (FC) ..................................... 305
4.3.18.3 Protocol Specific Port Mode page (19h) for Serial Attached SCSI (SAS) ........ 307
4.3.18.3.1 Protocol-specific Port mode page overview ............................................... 307
4.3.18.3.2 Protocol-Specific Port mode page - short format ....................................... 308
4.3.18.3.3 Protocol-Specific Port mode page - Phy Control And Discover subpage (19h) 310
4.3.19 Rigid Drive Geometry Parameters page (04h) ............................................................. 312
4.3.20 Unit Attention parameters page (00h) ........................................................................... 314
4.3.21 Verify Error Recovery mode page (07h) ....................................................................... 316
4.4 Vital product data parameters .................................................................................................. 318
4.4.1 Vital product data parameters overview and page codes ............................................. 318
4.4.2 ASCII Information VPD page (01h - 7Fh) ..................................................................... 319
4.4.3 Date Code page (C1h) .................................................................................................. 320
4.4.4 Device Behavior page (C3h) ......................................................................................... 321
4.4.5 Extended INQUIRY Data VPD page (86h) ................................................................... 322
4.4.6 Firmware Numbers page (C0h) ....................................................................................324
4.4.7 Device Identification VPD page (83h) ...........................................................................327
4.4.8 Jumper Settings page (C2h) ......................................................................................... 330
4.4.9 Supported Vital Product Data pages (00h) ................................................................... 333
4.4.10 Unit Serial Number page (80h) ..................................................................................... 334
Index ....................................................................................................... 335
SCSI Commands Reference Manual, Rev. A ix
x SCSI Commands Reference Manual, Rev. A
List of Tables
Table 1. ISO v American Numbering Conventions .................................................................................. 15
Table 2. Typical CDB for 6-byte commands ............................................................................................ 18
Table 3. Typical CDB for 10-byte commands .......................................................................................... 19
Table 4. Typical CDB for 12-byte commands .......................................................................................... 19
Table 5. Typical CDB for 16-byte commands .......................................................................................... 20
Table 6. Typical CDB for long LBA 16-byte commands .......................................................................... 21
Table 7. Typical variable length CDB ...................................................................................................... 22
Table 8. Typical variable length CDB for long LBA 32-byte commands .................................................. 23
Table 9. OPERATION CODE byte .......................................................................................................... 24
Table 10. Group Code values .................................................................................................................... 24
Table 11. Control Byte ............................................................................................................................... 26
Table 12. Sense data response codes ...................................................................................................... 29
Table 13. Descriptor format sense data ..................................................................................................... 30
Table 14. Sense data descriptor format ..................................................................................................... 31
Table 15. Sense data descriptor types ...................................................................................................... 31
Table 16. Information sense data descriptor format .................................................................................. 32
Table 17. Command-specific information sense data descriptor format .................................................... 33
Table 18. Sense key specific sense data descriptor format ...................................................................... 34
Table 19. Sense key specific field definitions ............................................................................................ 35
Table 20. Field pointer sense key specific data ......................................................................................... 35
Table 21. Actual retry count sense key specific data ................................................................................. 36
Table 22. Progress indication sense key specific data .............................................................................. 37
Table 23. Segment pointer sense key specific data .................................................................................. 37
Table 24. Field replaceable unit sense data descriptor format .................................................................. 38
Table 25. Vendor specific sense data descriptor format ............................................................................ 38
Table 26. Fixed format sense data ............................................................................................................ 39
Table 27. Sense key descriptions .............................................................................................................. 42
Table 28. Additional Sense and Additional Sense Qualifier codes ............................................................ 43
Table 29. CHANGE DEFINITION command .............................................................................................54
Table 30. Definition parameter field ........................................................................................................... 54
Table 31. FORMAT UNIT command ......................................................................................................... 57
Table 32. FORMAT UNIT command address descriptor usage ................................................................ 59
Table 33. FORMAT UNIT parameter list ................................................................................................... 60
Table 34. Short parameter list header ....................................................................................................... 61
Table 35. Long parameter list header ........................................................................................................ 61
Table 36. FMTPINFO bit, RTO_REQ bit, and PROTECTION FIELDS USAGE field ................................ 61
Table 37. Initialization pattern descriptor ................................................................................................... 64
Table 38. Initialization pattern modifier (IP MODIFIER) field ..................................................................... 65
SCSI Commands Reference Manual, Rev. A xi
Table 39. initialization pattern type field .....................................................................................................66
Table 40. Address descriptor formats ........................................................................................................67
Table 41. Short block format address descriptor (000b) ............................................................................67
Table 42. Long block format address descriptor (011b) .............................................................................67
Table 43. Bytes from index format address descriptor (100b) ...................................................................68
Table 44. Physical sector format address descriptor (101b) ......................................................................69
Table 45. INQUIRY command ...................................................................................................................70
Table 46. Standard INQUIRY data format .................................................................................................72
Table 47. PERIPHERAL QUALIFIER ........................................................................................................73
Table 48. PERIPHERAL DEVICE TYPE ....................................................................................................74
Table 49. VERSION field codes .................................................................................................................75
Table 50. Taret Port GroupSupport codes .................................................................................................76
Table 51. BQue and CmdQue bit combinations .........................................................................................77
Table 52. SPI-specific standard INQUIRY bits ...........................................................................................78
Table 53. ADDR and WBUS bit rela tio nship s ............................ ...... ............................................. .............79
Table 54. CLOCKING codes ......................................................................................................................79
Table 55. LOG SELECT command ............................................................................................................81
Table 56. Page Control field values ...........................................................................................................82
Table 57. LOG SENSE command ..............................................................................................................84
Table 58. MODE SELECT(6) command ....................................................................................................86
Table 59. Mode page policies ....................................................................................................................86
Table 60. MODE SELECT(10) command ..................................................................................................88
Table 61. MODE SENSE(6) command ......................................................................................................89
Table 62. Page control (PC) field ...............................................................................................................89
Table 63. Mode page code usage for all devices .......................................................................................90
Table 64. MODE SENSE(10) command ....................................................................................................92
Table 65. PERSISTENT RESERVE IN command .....................................................................................93
Table 66. PERSISTENT RESERVE IN service action codes ....................................................................93
Table 67. PERSISTENT RESERVE IN parameter data for READ KEYS ..................................................94
Table 68. PERSISTENT RESERVE IN parameter data for READ RESERVATION with reservation .......95
Table 69. PERSISTENT RESERVE IN data for READ RESERVATION with no reservation held ............95
Table 70. Persistent reservation scope codes ...........................................................................................96
Table 71. Persistent reservation type codes ..............................................................................................97
Table 72. PERSISTENT RESERVE IN parameter data for REPORT CAPABILITIES ..............................98
Table 73. Persistent Reservation Type Mask format .................................................................................99
Table 74. PERSISTENT RESERVE IN parameter data for READ FULL STATUS .................................100
Table 75. PERSISTENT RESERVE IN full status descriptor format ........................................................101
Table 76. PERSISTENT RESERVE OUT command ...............................................................................103
Table 77. PERSISTENT RESERVE OUT service action codes ..............................................................104
Table 78. PERSISTENT RESERVE OUT parameter list .........................................................................105
Table 79. PERSISTENT RESERVE OUT specify initiator ports additional parameter data ....................106
Table 80. PERSISTENT RESERVE OUT service actions and valid parameters (part 1 of 2) .................107
Table 81. PERSISTENT RESERVE OUT command with REGISTER AND MOVE service ....................108
Table 82. PERSISTENT RESERVE OUT service actions and valid parameters (part 2 of 2) .................108
Table 83. READ (6) command .................................................................................................................111
Table 84. Protection information checking for READ (6) .........................................................................112
Table 85. READ (10) command ...............................................................................................................113
xii SCSI Commands Reference Manual, Rev. A
Table 86. RDPROTECT field ................................................................................................................... 113
Table 87. Force unit access for read operations ..................................................................................... 117
Table 88. READ (12) command ............................................................................................................... 118
Table 89. READ (16) command ............................................................................................................... 119
Table 90. READ (32) command ............................................................................................................... 120
Table 91. READ BUFFER command ....................................................................................................... 122
Table 92. READ BUFFER MODE field .................................................................................................... 122
Table 93. READ BUFFER header ........................................................................................................... 123
Table 94. Buffer offset boundary ............................................................................................................. 124
Table 95. READ BUFFER descriptor ....................................................................................................... 124
Table 96. Echo buffer descriptor .............................................................................................................. 125
Table 97. READ CAPACITY (10) command ............................................................................................126
Table 98. READ CAPACITY (10) parameter data ................................................................................... 127
Table 99. READ CAPACITY (16) command ............................................................................................128
Table 100. READ CAPACITY (16) parameter data ................................................................................... 129
Table 101. P_TYPE field and PROT_EN bit ..............................................................................................................129
Table 102. READ DEFECT DATA (10) command ..................................................................................... 130
Table 103. READ DEFECT DATA (10) parameter data ............................................................................ 131
Table 104. READ DEFECT DATA (12) command ..................................................................................... 133
Table 105. READ DEFECT DATA (12) parameter data ............................................................................ 134
Table 106. READ LONG (10) command ................................................................................................... 135
Table 107. READ LONG (16) command ................................................................................................... 136
Table 108. REASSIGN BLOCKS command ..............................................................................................137
Table 109. REASSIGN BLOCKS parameter list ........................................................................................ 138
Table 110. REASSIGN BLOCKS short parameter list header ................................................................... 138
Table 111. REASSIGN BLOCKS long parameter list header .................................................................... 138
Table 112. RECEIVE DIAGNOSTIC RESULTS command ....................................................................... 140
Table 113. Diagnostic Data Bytes ............................................................................................................. 141
Table 114. RELEASE(6) Command .......................................................................................................... 143
Table 115. RELEASE (10) Command ....................................................................................................... 144
Table 116. RELEASE(10) parameter list ................................................................................................... 145
Table 117. REPORT DEVICE IDENTIFIER command .............................................................................. 146
Table 118. REPORT DEVICE IDENTIFIER parameter data ..................................................................... 146
Table 119. REPORT LUNS command ...................................................................................................... 148
Table 120. SELECT REPORT field ........................................................................................................... 148
Table 121. REPORT LUNS parameter data format ................................................................................... 149
Table 122. REQUEST SENSE command ................................................................................................. 151
Table 123. Response codes 70h and 71h sense data format ................................................................... 153
Table 124. Field pointer bytes ................................................................................................................... 155
Table 125. Actual Retry Count Bytes ......................................................................................................... 156
Table 126. Progress Indication Bytes ........................................................................................................ 156
Table 127. Segment pointer bytes ............................................................................................................. 156
Table 128. RESERVE(6) command .......................................................................................................... 158
Table 129. RELEASE (10) Command ....................................................................................................... 159
Table 130. RESERVE(10) ID only parameter list ...................................................................................... 160
Table 131. REZERO UNIT command (01h) .............................................................................................. 162
Table 132. SEEK command (0Bh) ............................................................................................................. 163
SCSI Commands Reference Manual, Rev. A xiii
Table 133. SEEK command (2Bh) .............................................................................................................164
Table 134. SEND DIAGNOSTIC command ...............................................................................................165
Table 135. SELF-TEST CODE field ...........................................................................................................166
Table 136. SET DEVICE IDENTIFIER command ......................................................................................168
Table 137. SET DEVICE IDENTIFIER parameter list ................................................................................169
Table 138. START STOP UNIT command ............................................................................... ...... ....... . ...170
Table 139. POWER CONDITION field .......................................................................................................170
Table 140. SYNCHRONIZE CACHE (10) command .................................................................................172
Table 141. SYNC_NV bit ...........................................................................................................................172
Table 142. SYNCHRONIZE CACHE (16) command .................................................................................173
Table 143. TEST UNIT READY command ................................................................................................174
Table 144. Preferred TEST UNIT READY responses ................................................................................174
Table 145. VERIFY (10) command ............................................................................................................175
Table 146. VRPROTECT field with BYTCHK set to zero - medium ...........................................................176
Table 147. VRPROTECT field with BYTCHK set to one - medium ............................................................179
Table 148. VRPROTECT field with BYTCHK set to one - data-out buffer .................................................181
Table 149. VRPROTECT field with BYTCHK set to one - byte-by-byte comparison requirements ...........183
Table 150. VERIFY (12) command ............................................................................................................185
Table 151. VERIFY (16) command ............................................................................................................186
Table 152. VERIFY (32) command ............................................................................................................187
Table 153. WRITE (6) command ...............................................................................................................189
Table 154. WRITE (10) command .............................................................................................................190
Table 155. WRPROTECT field ..................................................................................................................190
Table 156. Force unit access for write operations .....................................................................................193
Table 157. WRITE (12) command .............................................................................................................194
Table 158. WRITE (16) command .............................................................................................................195
Table 159. WRITE (32) command .............................................................................................................196
Table 160. WRITE AND VERIFY (10) command .......................................................................................198
Table 161. WRITE AND VERIFY (12) command .......................................................................................199
Table 162. WRITE AND VERIFY (16) command .......................................................................................200
Table 163. WRITE AND VERIFY (32) command .......................................................................................201
Table 164. WRITE BUFFER command .....................................................................................................203
Table 165. WRITE BUFFER MODE field ...................................................................................................203
Table 166. Application log data WRITE BUFFER format ...........................................................................208
Table 167. ERROR TYPE field ..................................................................................................................209
Table 168. CODE SET field .......................................................................................................................209
Table 169. ERROR LOCATION FORMAT field .........................................................................................209
Table 170. WRITE LONG (10) command ..................................................................................................211
Table 171. WRITE LONG (16) command ..................................................................................................212
Table 172. WRITE SAME (10) command ..................................................................................................213
Table 173. LBDATA bit and PBDATA bit ...................................................................................................214
Table 174. WRITE SAME (16) command ..................................................................................................215
Table 175. WRITE SAME (32) command ..................................................................................................216
Table 176. Diagnostic page format ............................................................................................................220
Table 177. Diagnostic page codes .............................................................................................................221
Table 178. Supported diagnostic pages .....................................................................................................221
Table 179. Translate Address page—Receive Diagnostic (40h) ...............................................................222
xiv SCSI Commands Reference Manual, Rev. A
Table 180. Address Field Logical Block Address Format .......................................................................... 223
Table 181. Address Field Physical Sector Address Format ...................................................................... 223
Table 182. SCSI Enclosure Services page ................................................................................................ 224
Table 183. Log page format ....................................................................................................................... 225
Table 184. Log parameter ......................................................................................................................... 226
Table 185. Threshold met criteria .............................................................................................................. 227
Table 186. Log page codes ....................................................................................................................... 229
Table 187. Application client log page ....................................................................................................... 230
Table 188. General usage application client parameter data .................................................................... 230
Table 189. Parameter control bits for general usage parameters (0000h through 0FFFh) ....................... 231
Table 190. Background Scan Results log page ......................................................................................... 232
Table 191. Background Scan Results Parameter codes ........................................................................... 232
Table 192. Background scanning status parameter format ....................................................................... 233
Table 193. Background Scanning Status codes ........................................................................................ 234
Table 194. Medium scan parameter format ............................................................................................... 235
Table 195. REASSIGN STATUS FIELD .................................................................................................... 236
Table 196. Cache Statistics page (37h) ..................................................................................................... 237
Table 197. Error counter log page codes .................................................................................................. 237
Table 198. Parameter codes for error counter log pages ..........................................................................238
Table 199. Factory Log page (3Eh) ........................................................................................................... 239
Table 200. Informational Exceptions log page ........................................................................................... 239
Table 201. Informational exceptions parameter codes .............................................................................. 239
Table 202. Informational exceptions general parameter data ................................................................... 240
Table 203. Parameter control bits for Informational exceptions log parameter (0000h) ............................ 240
Table 204. Non-medium error event parameter codes .............................................................................. 241
Table 205. Non-Medium Error page (06h) ................................................................................................. 241
Table 206. Self-Test Results log page ....................................................................................................... 242
Table 207. Self-test results log parameter format ...................................................................................... 243
Table 208. Parameter control bits for self-test results log parameters ...................................................... 243
Table 209. SELF-TEST RESULTS field .................................................................................................... 244
Table 210. Start-Stop Cycle Counter log page .......................................................................................... 245
Table 211. Parameter control bits for date of manufacture parameter (0001h) ......................................... 246
Table 212. Parameter control bits for accounting date parameter (0002h) ............................................... 247
Table 213. Parameter control bits for start-stop cycle counter parameters (0003h and 0004h) ................ 247
Table 214. Supported log pages ................................................................................................................ 248
Table 215. Temperature log page ............................................................................................................. 249
Table 216. Parameter control bits for temperature parameters (0000h and 0001h) ................................. 250
Table 217. Mode parameter list ................................................................................................................. 251
Table 218. Mode parameter header(6) ...................................................................................................... 251
Table 219. Mode parameter header(10) .................................................................................................... 252
Table 220. General mode parameter block descriptor ..............................................................................253
Table 221. Page_0 mode page format ...................................................................................................... 254
Table 222. SUB_PAGE mode page format ............................................................................................... 254
Table 223. Mode page codes and subpage codes ....................................................................................256
Table 224. Short LBA mode parameter block descriptor ........................................................................... 257
Table 225. Long LBA mode parameter block descriptor ........................................................................... 258
Table 226. Background Control mode page .............................................................................................. 260
SCSI Commands Reference Manual, Rev. A xv
Table 227. Caching Parameters page (08h) ..............................................................................................261
Table 228. Control mode page ...................................................................................................................264
Table 229. Task set type (TST) field ..........................................................................................................264
Table 230. QUEUE ALGORITHM MODIFIER field ....................................................................................265
Table 231. Queue error management (QERR) field ..................................................................................266
Table 232. Unit attention interlocks control (UA_INTLCK_CTRL) field ......................................................267
Table 233. AUTOLOAD MODE field ..........................................................................................................268
Table 234. Control Extension mode page ..................................................................................................269
Table 235. Disconnect-Reconnect mode page ..........................................................................................270
Table 236. Data transfer disconnect control ..............................................................................................272
Table 237. Disconnect-Reconnect mode page (02h) .................................................................................273
Table 238. Disconnect-Reconnect mode page for SAS .............................................................................276
Table 239. Format Parameters page (03h) ................................................................................................278
Table 240. Informational Exceptions Control mode page ..........................................................................280
Table 241. Method of reporting informational exceptions (MRIE) field ......................................................281
Table 242. Notch page (0Ch) .....................................................................................................................283
Table 243. Power Condition mode page ....................................................................................................285
Table 244. Read-Write Error Recovery mode page ...................................................................................287
Table 245. Combined error recovery bit descriptions ................................................................................289
Table 246. protocol identifier values ..........................................................................................................293
Table 247. Protocol Specific Logical Unit mode page ................................................................................293
Table 248. Fibre Channel Logical Unit Control mode page (18h) ..............................................................295
Table 249. SAS Protocol-Specific Logical Unit mode page subpages .......................................................296
Table 250. Protocol-Specific Logical Unit mode page for SAS SSP - short format ...................................296
Table 251. Page_0 format Protocol Specific Port mode page ...................................................................297
Table 252. Sub_page format Protocol Specific Port mode page ...............................................................297
Table 253. Port Control Mode page short format (19h) .............................................................................298
Table 254. Port Control Mode page long format (19h) ...............................................................................299
Table 255. Margin control subpage ............................................................................................................301
Table 256. Saved training configuration values subpage ..........................................................................302
Table 257. Negotiated settings subpage ....................................................................................................304
Table 258. Report transfer capabilities subpage ........................................................................................305
Table 259. Fibre Channel Interface Control page (19h) .............................................................................306
Table 260. Protocol-Specific Port mode page subpages ...........................................................................308
Table 261. Protocol-Specific Port mode page for SAS SSP - short format ................................................308
Table 262. Protocol-Specific Port mode page SAS SSP - Phy Control And Discover subpage ................310
Table 263. SAS phy mode descriptor .......................................................................................................311
Table 264. Rigid Drive Geometry Parameters page (04h) .........................................................................312
Table 265. Unit Attention parameters page (00h) ......................................................................................314
Table 266. Verify Error Recovery mode page ............................................................................................316
Table 267. Vital product data page codes ..................................................................................................318
Table 268. ASCII Information VPD page ...................................................................................................319
Table 269. ETF Log Date Code page (C1h) ..............................................................................................320
Table 270. Device Behavior page (C3h) ....................................................................................................321
Table 271. Extended INQUIRY Data VPD page ........................................................................................322
Table 272. SPT field ...................................................................................................................................322
Table 273. Firmware Number s page (C0h) ........................................................................ ....... ...... .... .......324
xvi SCSI Commands Reference Manual, Rev. A
Table 274. Firmware Numbers page (C0h) (Applies to model families not covered by Table 273) .......... 325
Table 275. Device Identification VPD page ............................................................................................... 327
Table 276. Identification Descriptor ........................................................................................................... 328
Table 277. Code Set .................................................................................................................................. 328
Table 278. PROTOCOL IDENTIFIER values ............................................................................................ 328
Table 279. ASSOCIATION field ................................................................................................................. 329
Table 280. IDENTIFIER Type field ............................................................................................................ 329
Table 281. Device Identification page example ......................................................................................... 330
Table 282. Jumper Settings page (C2h) .................................................................................................... 330
Table 283. Drive ID bit ............................................................................................................................... 331
Table 284. Supported Vital Product Data pages ....................................................................................... 333
Table 285. Unit Serial Number page (80h) ................................................................................................ 334
SCSI Commands Reference Manual, Rev. A xvii
xviii SCSI Commands Reference Manual, Rev. A
1.0 Definitions, symbols, abbreviations, keywords, and conventions
This clause contain s the def initions, s ymbols, abbreviat ions, ke ywords and, con ventions us ed throu ghout this
manual. These items are fr om the Americ an National Standards Institute T10 co mmittee as referenc ed in the
SCSI Primary Commands SPC-4 rev 2 draft and the SCSI Block Commands SBC -2 rev 16 draft.
Applicable Documents:
T10/1416-D SCSI Primary Commands - 3 (SPC-3) Revision 23
T10/1731-D SCSI Primary Commands - 4 (SPC-4) Revision 2
T10/xxxx-D SCSI Block Commands - 3 (SBC-3) Revision 2
T10/1560-D Fibre Channel Protocol for SCSI, Third Editon (FCP-3) Revision 4
T10/1760-D Serial Attached SCSI - 2 (SAS-2) Revision 00
T10/1683-D SCSI Architecure Model - 4 (SAM-4) Revision 3
SCSI Commands Reference Manual, Rev. A 1
1.1 Definitions
Access control list (ACL)
The data used by a SCSI target device to configure access rights for initiator ports according to the access
controls state of the SCSI target device.
Access control list entry (ACE)
One entry in the access control list.
Access controls
An optional SCSI target dev ice feat ure that res tricts ini tiator port acces s to sp ecifi c logical units and mod i-
fies the information a bout logical units in the parame ter data of the INQUIRY and REPORT LUNS com-
mands.
Access controls coordinator
The entity within a SCSI targ et device that c oordinates the manageme nt and enfor cement of ac cess con-
trols for all logi cal u nits withi n the S CS I target de vice . The acce ss c ontro ls coor dinat or is always addr ess-
able through the ACCESS CONTROLS well known logical unit and LUN 0.
active power condition
When a device server is capable of res ponding to a ll of its suppor ted comma nds, incl uding medi a access
requests, without delay.
additional sense code
A combination of the ADDITIONAL SENSE CODE and ADDITI ONAL SENSE CODE QUALIFIER fie lds in
the sense data.
Alias list
A list of alias v alues and their assoc iated desi gnations maintained by the device server an d managed by
the CHANGE ALIASES command and REPORT ALIASES command.
Alias value
A numeric value associated to a designation in the alias list and used in command or parameter data to ref-
erence a SCSI target device or SCSI target port.
Application client
An object that is th e s ourc e o f S C SI c omm and s. F urther d efi nit ion of an application client may be found in
SAM-3.
Attached medium changer
A medium changer that is attached to and accessed through some other type of SCSI device.
Attribute
A single unit of MAM information.
Auto contingent allegiance (ACA)
The task set condition established following the return of a CHECK CONDITION status when the NACA bit
is set to one in the CONTROL byte. A detailed definition of ACA may be found in SAM-3.
Blocked task
A task that is in the b locked state. Tasks become blocked when an ACA condition occurs. The blocked
state ends when the ACA condition is c leare d. A detail ed def ini ti on of the bl oc ke d task state may be foun d
in SAM-3.
Byte
A sequence of eight contiguous bits considered as a unit.
Cache
See cache memory.
2 SCSI Commands Reference Manual, Rev. A
Cache memory
A temporary and often v olatile data storage area outside th e area accessible by applicat ion clients that
may contain a subset of the data stored in the non-volatile data storage area.
Check data
Information contained within a re dundancy group that may allow lo st or destroyed XOR-protected data to
be recreated.
Command
A request describing a unit of work to be performed by a device server. A detailed definition of a command
may be found in SAM-3.
Command descriptor block (CDB)
The structure used to communicat e commands fr om an appli cation clie nt to a device s erver. A CDB may
have a fixed length of up to 16 bytes or a variable length of between 12 and 260 bytes.
Command standard
A SCSI standard that defin es the model, comma nds, and parameter data for a de vice type (e.g., SB C-2,
SSC-2, SMC-2, MMC-4, or SES-2).
Company_id
Synonym for OUI.
Control mode page
A mode page that provides controls over SCSI features (e.g., task set management and error logging) that
are applicable to all device types.
Control Extension mode page
A mode page that provides controls over SCSI features that are applicable to all device types.
Copy manager
The device server that receives an EXTENDED COPY command and performs the operation requested.
Copy target device
The name given by the EX TENDED COPY command to a source or destinati on logical unit (i.e., a c opy
target device is a logical unit, not a SCSI target device).
Cyclic redundancy check (CRC)
An error checking mechanism that checks data integrity by computing a polynomial algorithm based
checksum.
Data defect list (DLIST)
A list of defects sent by the application client to the device server during a FORMAT UNIT command.
Data-in buffer
The buffer specified by the a pplicati on clie nt to receiv e data from the device ser ver duri ng the proce ssing
of a command.
Data-out buffer
The buffer specified by the applicati on client to supply data that is sent from the appl ication client to the
device server during the processing of a command.
Default protection information
Values placed into protec tion information fi elds if an applicati on client does not s pecify specifi c protection
information values.
Deferred error
A CHECK CONDITION status and sense data that is returned as the resul t of an er r or or exception condition that occurred during p roce ssing o f a previo us co mmand f or which GOOD, CO NDITION MET, INTERMEDIATE, and INTERMEDIATE-CONDITION MET status has already been returned.
SCSI Commands Reference Manual, Rev. A 3
Designation
When used in reference to access controls, a name and optional identifier information that specifies a
SCSI target device or SCSI target port for as so ci ation wi th an al ia s v alu e in the ali as lis t. Othe rw is e, a dis-
tinguishing name, identifier, or title.
Device Identification VPD page
A VPD page that provides the means to re trieve identification info rmation about the SCSI device, lo gical
unit, and SCSI port.
Device server
An object within a logi cal unit that processes S CSI tasks according to the rul es of task management. A
detailed definition of a device server may be found in SAM-3.
Device service request
A request, submi tted by an appl ication client, conveying a S CSI command to a device serv er. A detailed
definition of a device service request may be found in SAM-3.
Device service response
The response returne d to an application cli ent by a device se rver on completion o f a SCSI command. A
detailed definition of a device service response may be found in SAM-3.
Device type
The type of peripheral device (i.e., device model) implemented by the device ser ver and indic ated by the
contents of the PERIPHERAL DEVICE TYPE field in the standard INQUIRY data.
Direct-access block device
A device that is capable of containing data stored in blocks that each have a unique logical block address.
Disconnect-Reconnect mode page
A mode page that provides the application client the means to tune the performance of the service delivery
subsystem.
Domain
An I/O system con sisting of a set of SCSI devices that i nteract with one anoth er by means of a s ervice
delivery subsystem.
Element
An addressable physical component of a medium changer SCSI device that may serve as the location of a
removable unit of data storage medium. A detailed definition of an element may be found in SMC-2.
Enabled task state
The only task state in whi ch a task may make progress towards completion. A d etailed definition of the
enabled task state may be found in SAM-3.
Error correcting code (ECC)
An error checki ng mechanism that che cks data integrity and enables some errors i n the data to be cor-
rected.
Exclusive-or (XOR)
A Boolean arithmetic function on two binary input values that results in an output value of 1 if one and only
one of the input values is 1.
Extended Unique Identifier, a 48-bit globally unique identifier (EUI-48)
The IEEE maintains a tutorial describing EUI-48 at http://standards.ieee.org/regauth/oui/tutorials/
EUI48.html.
Extended Unique Identifier, a 64-bit globally unique identifier (EUI-64)
The IEEE maintains a tutorial describing EUI-64 at http://standards.ieee.org/regauth/oui/tutorials/
EUI64.html.
4 SCSI Commands Reference Manual, Rev. A
Extent
A fixed set of logical blocks occupying contiguous logical block addresses on a single logical unit.
Faulted I_T nexus
The I_T nexus on which a CHECK CONDITIO N status was returned tha t resulted in the establishmen t of
an ACA. The faulted I_T nexus condition is cleared when the ACA condition is cleared.
Field
A group of one or more contiguous bits, a part of a larger structure such as a CDB or sense data.
Format corrupt
a vendor-specific condition in which the application client may not be able to perform read operations, write
operations, or verify operations.
Grown defect list (GLIST)
All defects sent by the application client to the device server.
Hard reset
A condition resul ting fr om th e even ts defined by SAM -3 i n which th e SC SI de vice perfo rms the hard reset
operations described in SAM-3, the standard, and the applicable command standards.
Host
A SCSI device with the characteristics of a primary computing device, typically a personal computer, workstation, server, minicomputer, mainframe com puter, or auxiliary computing device. A ho st includ es one or
more SCSI initiator devices.
IEEE company_id
Synonym for OUI.
I_T nexus
A nexus between a SCSI initiator port and a SCSI target port.
I_T nexus loss
A condition resultin g from the events def ined by SA M-3 in which th e SCSI de vice perfor ms the I_T nex us
loss operations described in SAM-3, the standard, and the applicable command standards.
I_T_L nexus
A nexus between a SCSI initiator port, a SCSI target port, and a logical unit.
I_T_L_Q nexus transaction
The information transferred between SCSI ports in a single data structure with defined boundaries (e.g., an
information unit).
Idle power condition
When a device server is capable of res ponding to a ll of its supported comma nds, includi ng media ac cess
requests, but commands may take longer to complete than when in the active power condition.
Implicit head of queue
An optional processing model for specified commands wherein the specified commands may be treated as
if they had been received with a HEAD OF QUEUE
task attribute.
Initiator device name
A SCSI device name of a SCSI initiator device or of a SC SI target/initiator device when operatin g as a
SCSI initiator device.
Initiator port
Synonymous with SCSI initiator port.
SCSI Commands Reference Manual, Rev. A 5
Initiator port identifier
A value by which a SCSI initiator port is referenced within a SCSI domain.
Initiator port name
A SCSI port name of a SCSI initiator port or of a SCSI target/i nit iat or port when ope ra tin g as a SCSI in itia -
tor port.
Internet protocol domain name
The name of a compute r or hierarchy o f computers withi n the domain name s ystem defined b y the IETF
(see RFC 1035 and RFC 1591). The Internet Assigned Numbers Authority maintains a list of domain name
assignments at http://www.iana.org/assignments/domain-names.
Internet protocol number
A coded value assigned to identify protocols that layer on the Internet protocol (see RFC 791). The Internet
protocol number assign ed to the transmission control p rotocol (TCP, see RFC 79 3) is six. The Internet
Assigned Numbers Authority maintains a list of Internet protocol number assignments at http://
www.iana.org/assignments/protocol-numbers.
Linked command
One in a series of SCSI commands processe d by a single task that col lectively make up a disc rete I/O
operation. A detailed definition of a linked command may be found in SAM-3.
Least significant bit (LSB)
In a binary code, the bit or bit po sition with the sma llest numerical weighting in a group of bits that, when
taken as a whole, represent a numerical value (e.g., in the number 0001b, the bit that is set to one).
Left-aligned
A type of field containing ASCII data in whi ch unused byte s are placed at the end of the field ( highest off-
set) and are filled with ASCII space (20h) characters.
Logical block
A set of data bytes accessed and referenced as a unit.
Logical block address (LBA)
The value used to reference a logical block.
Logical unit
An externally addressa ble entity within a SCSI target device that im plements a SCSI device model and
contains a device server. A detailed definition of a logical unit may be found in SAM-3.
Logical unit access control descriptor (LUACD)
The structure within an ACE that ide ntifies a logical unit to which acc ess is allowed an d specifie s the LUN
by which the logical unit is to be accessed.
Logical unit certification list (CLIST)
Defects detected by the dev ice serve r during an optional certific ation proc ess perf ormed duri ng the FOR-
MAT UNIT command.
Logical unit inventory
The list of the logical unit numbers reported by a REPORT LUNS command.
Logical unit number (LUN)
An encoded 64-bit identifier for a logical unit. A detailed definition of a logical unit number may be found in
SAM-3.
Logical unit reset
A condition resu lting from the events de fined by SAM-3 in which the logica l unit performs the logical unit
reset operations described in SAM-3, the standard, and the applicable command standards.
6 SCSI Commands Reference Manual, Rev. A
Media
Plural of Medium
Medium
A physical entity that stores data in a nonv olatile manner (i.e., r etained through a power c ycle) in accordance with commands processed by the device server.
Medium auxiliary memory (MAM)
An auxiliary mem ory res iding on a medium that is accessi ble to the device server (e.g., a tape cartr idge).
Medium auxiliary memory may be nonvolatile and independent of the main function of the device server.
Medium changer
A device that mechaniz es the movement o f media to and from th e SCSI device that records on or re ads
from the media. A detailed definition of a medium changer may be found in SMC-2.
Most significant bit (MSB)
In a binary code, the bit or bit position wi th the largest numerical weightin g in a group of bits that, when
taken as a whole, represent a numerical value (e.g., in the number 1000b, the bit that is set to one).
Name
A label of an object that is unique within a specified context and should never change (e.g., the term name
and worldwide identifier (WWID) may be interchangeable).
Network address authority (NAA)
A field within a name that specifies the format and length of that name. See FC-FS.
Nexus
A relationship betwe en two SCSI devic es, and the SCSI ini tiator port and SCS I target port objects withi n
those SCSI devices.
Non-volatile cache
Cache that retains data through power cycles.
Non-volatile cache memory
Cache memory that retains data through power cycles.
Non-volatile medium
A physical storage medium that retains data written to it for subsequent read operations through power
cycles (e.g., a disk withi n a device that stores data as ma gnetic field changes tha t do not require device
power to exist).
Null-padded
A type of field in which unused bytes are placed at the end of the fie ld (i.e., highest offset) and are filled
with ASCII null (00h) characters.
Null-terminated
A type of field in which the last used byte (i.e., hi ghest offset) is required to contain an ASCII null (00h)
character.
One
The logical true condition of a variable.
Operation Code
The first byte of a SCSI CDB shall contain an operation code identifying the operation being requested by the CDB.
Organizationally unique identifier (OUI)
A numeric identi fier that is assigned by t he IEEE such that no a ssigned identifiers are ident ical. OUI is
equivalent to company_id or IEEE company_id. The IEEE prefers OUI for EUI-48 identifiers and
company_id for EUI-64 i dentif iers. However, the numeric identi fier is call ed an O UI when it is ass igne d by
the IEEE. The IEEE maintains a tutorial describing the OUI at http://standards.ieee.org/regauth/oui/.
SCSI Commands Reference Manual, Rev. A 7
Page
A regular parameter struct ure (or format) used by several com mands. These pages are identified wi th a
value known as a page code.
Persist through power loss
An optional capability associated with some features that allows an application client to request that a
device server maintain information regarding that feature across power failures.
Persistent reservation holder
The I_T nexus(es) that are allowed to release or change a persistent reservation without preempting it.
Power cycle
Power being removed from and later applied to a SCSI device.
Power on
A condition result ing from the events defined b y SAM-3 in wh ich the SCSI device perform s the power o n
operations described in SAM-3, the standard, and the applicable command standards.
Primary defect list (PLIST)
The list of defects that are considered permanent defects.
Protection information
Fields appended to each logica l block that contain a cyclic redundanc y check (CRC), an application tag,
and a reference tag.
Protocol identifier
A coded value used in various fields to identify the protocol to which other fields apply.
Protocol specific
A requirement that is defin ed by a SC SI transp ort protoc ol standard . A detailed definition of protoc ol spe-
cific may be found in SAM-3.
Protocol standard
A SCSI standard that defines SCSI transport protocol (e.g., SAS, SPI-5, SBP-3, or FCP-2).
Proxy token
An identifier for a logical unit that may be used to gain temporary access to that logical unit in the presence
of access controls.
Redundancy group
A grouping of XOR- protected data and associate d check data into a single type of data redundanc y (see
SCC-2). the standard only supports the XOR type of redundancy.
Request for comment (RFC)
The name given to standards developed by the Internet Engineering Task Force.
Registered
The condition that exists for an I_T nexus following the successful completion of a PERSISTENT
RESERVE OUT command with a REGISTER service action, REGISTER A ND IGNORE EXISTING KEY
service action, or REGISTER AND MOVE service action and lasting until the registration is removed.
Registrant
An I_T nexus that is registered.
Right-aligned
A type of field c ontaining ASCII da ta in whi ch unus ed by tes a re placed a t the start of the field ( i.e., lowest
offset) and are filled with ASCII space (20h) characters.
8 SCSI Commands Reference Manual, Rev. A
Relative port identifier
An identifier for a SCSI port that is unique within a SCSI device. Application clients may use the SCSI Ports
VPD page to determine relative port identifier values.
Relative initiator port identifier
A relative port identifier for a SCSI initiator port.
Relative target port identifier
A relative port identifier for a SCSI target port.
SCSI device
A device that contains on e or more SCSI ports that are conne cted to a service delivery subsystem and
supports a SCSI application protocol.
SCSI device name
A name of a SCSI device that is world wide unique within the protocol of a SCSI domain in which the SCSI
device has SCSI por ts. The SCSI device name may b e made available to other SCSI devices or SCSI
ports in protocol specific ways.
SCSI domain
The interconnection of two or more SCSI devices and a service delivery subsystem. A detailed definition of
a SCSI Domain may be found in SAM-3.
SCSI initiator device
A SCSI device contain ing app li cat ion cl ie nts and S C S I ini ti ator po rts that originate device serv i ce a nd task
management requests to be processed by a SCSI target device and receives device service and task management responses from SCSI target devices.
SCSI initiator port
A SCSI initiator device obje ct acts as the co nnection betw een appli cation clients an d the servic e delivery
subsystem through which requests and responses are routed.
SCSI port
A port of a SCSI d evice that c onnects the applica tion client, device server o r task manager t o the ser vice
delivery subsystem.
SCSI port identifier
A value by whi ch a SCSI p ort is refe renced within a domain. T he SCSI po rt identifi er is either an initia tor
port identifier or a target port identifier.
SCSI port name
A name of a SCSI port that is world wide unique wi thin the pr otocol of the S CSI domai n of that SCS I port.
The name may be made av ailable to other SCSI devices or SCSI ports in that S CSI domain in protocol
specific ways.
SCSI Ports VPD page
A VPD page that allows retriev al of information a bout all the SCSI ports in a S CSI target device or SCS I
target/initiator device.
SCSI target device
A SCSI device containing logical units and SCSI target ports that rec eives device service and task management requests for processing and sends device service and task management responses to SCSI initiator devices.
SCSI target port
A SCSI target device object that acts as the connection bet ween device server s and task managers an d
the service delivery subsystem through which requests and responses are routed.
SCSI transport protocol standard
A SCSI standard that defines a SCSI transport protocol (e.g., FCP-2, SAS, SRP, or SBP-3).
SCSI Commands Reference Manual, Rev. A 9
Sense data
Data describing an error or exceptional condition that a device server delivers to an application client in the
same I_T_L_Q nexus transaction as a CHECK CONDITION status or in response to a REQUEST SENSE
command. The format of sense data is defined in SPC-4.
Sense key
The contents of the
SENSE KEY field in the sense data.
Service action
A request describing a unit of work to be performed by a devi c e se rv er. A service action is an exte ns ion of
a command.
Service delivery subsystem
That part of a SCSI I/O syst em that t ransmits ser vice re quests to a logica l unit o r SCSI target device an d
returns logical unit or SCSI target device responses to a SCSI initiator device.
Standby power condition
When a device server is capable of accepting commands , but not capable of processing medi a access
commands.
Status
One byte of response inform ation sent from a device server to an applic ation client upon completion of
each command.
Storage array controller
Any combination of an initiator and ap plication clients (see SAM-3) that orig inates SCSI co mmands, con-
verts input LUNs to output LUNs, and converts input LBAs to output LBAs. A storage array controller orga-
nizes a group of direct -access block devices into various obj ects (e.g., redundancy groups and volume
sets). See SCC-2.
System
One or more SCSI domains operating as a single configuration.
Target device name
A SCSI device name of a SCSI target device or of a SCSI target/initiator device when operating as a SCSI
target device.
Target port
Synonymous with SCSI target port.
Target port asymmetric access state
The characteristic tha t defines the behavi or of a target port and the al lowable command set fo r a logical
unit when commands and task m anagement func tions are routed through the target port maintaining that
state.
Target port group
A set of target ports that are in the same target port asymmetric access state at all times.
Target port group asymmetric access state
The target port asymmetric access state common to the set of target ports in a target port group.
Target port identifier
A value by which a SCSI target port is referenced within a SCSI domain.
Target port name
A SCSI port name of a SCSI targe t port or of a SCSI targe t/initiato r port when oper ating as a SCSI targe t
port.
10 SCSI Commands Reference Manual, Rev. A
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