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Message Processing after the Selection Phase
Figure D-1 shows that the CTS will only accept three legal messages
immediately after the Selection phase (Abort, Reset, and Identify).
Parity Error in the Selection Phase
When parity checking is enabled and the CTS detects a parity error
during the Selection phase, it stays in the Message Out phase until the
Attention signal goes low. Then, it retries by going to the Message
Out phase again.
D-4
EXB-8205 and EXB-8505
(Standard and XL)
510503
Appendix D SCSI Bus Message Processing and Error Recovery
- 6&6,# 1
- 5HIHUHQFH 1
- Copyright 2
- Disclaimer 2
- Trademark Notices 2
- Revision History 2
- Product Warranty Caution 3
- Contents 5
- 4ERASE (19h) 4-1 6
- 5 INQUIRY (12h) 5-1 6
- 6 LOAD/UNLOAD (1Bh) 6-1 7
- 7LOCATE (2Bh) 7-1 7
- 8 LOG SELECT (4Ch) 8-1 7
- 9 LOG SENSE (4Dh) 9-1 7
- 25 WRITE (0Ah) 25-1 10
- 26 WRITE BUFFER (3Bh) 26-1 10
- 27 WRITE FILEMARKS (10h) 27-1 10
- Glossary G-1 11
- Index I-1 11
- SPACE (11h) 16
- WRITE (0Ah) 16
- WRITE FILEMARKS (10h) 16
- EEPROM Options 16
- Data Cartridge Capacities 16
- Error Information 17
- About This Manual 19
- Related Publications 21
- CTS Features 23
- 1 CTS Features 24
- Supported by the CTSs 26
- 1.2 Structure of Data on Tape 28
- Data Elements on Tape 31
- End of Data (EOD) 32
- Logical End of Tape (LEOT) 33
- Physical End of Tape (PEOT) 33
- Data Blocks 33
- Servo Areas 34
- 1.3 Controls and Indicators 35
- Unload Button 36
- SCSI Communication 41
- Table 2-2 44
- 2.3 SCSI Command Format 47
- Format of the Operation Code 48
- Descriptor Block 49
- Byte 05 - Control Byte 50
- Byte 00 - Operation Code 50
- 2.5 Command Format Errors 51
- 2.6 Command Status 52
- Good Status 53
- Check Condition 53
- Reservation Conflict 54
- 2.7 Message System 55
- Command Complete (00h) 56
- Extended Message (01h) 56
- 2 SCSI Communication 57
- Save Data Pointer (02h) 58
- Restore Pointers (03h) 58
- Disconnect (04h) 58
- Abort (06h) 59
- Message Reject (07h) 59
- No Operation (08h) 60
- Message Parity Error (09h) 60
- Bus Device Reset (0Ch) 60
- Identify (80h or C0h) 61
- Message Sequence 62
- Implementing CTS 63
- Operations 63
- 3.1 Using Data Cartridges 64
- Loading Data Cartridges 65
- Unloading Data Cartridges 65
- Normal Unload Button 66
- Fast Unload Button 66
- “Super Fast” Unload Button 67
- 6. The CTS is reset 68
- Error During Unload Procedure 69
- 3.3 Using Data Compression 71
- Filemarks 77
- Summary of Filemark Sizes 78
- Streaming Mode 79
- Start/Stop Mode 79
- Motion Threshold 82
- Reconnect Threshold 83
- What Are Partitions? 85
- Dual-Partition Tape 86
- Unpartitioned Tape 86
- How Do You Create Partitions? 87
- Changing Partitions 90
- Writing Data in Partitions 91
- Rewinding a Partitioned Tape 92
- Erasing a Partitioned Tape 92
- 3.8 Using Directory Support 93
- 3.10 Resetting the CTS 96
- Reset Processing 98
- EXB-8205 and EXB-8505 100
- (Standard and XL) 100
- ERASE (19h) 101
- 4.1 About This Command 102
- 4.2 Field Definitions 103
- 4.3 Tape Positioning 104
- INQUIRY (12h) 105
- 5.1 About This Command 106
- 5.2 Field Definitions 106
- Returning Inquiry Data 107
- 5.3 Standard Inquiry Data 108
- 5 INQUIRY (12h) 109
- 5.5 Unit Serial Number Page 113
- LOAD/UNLOAD (1Bh) 115
- 6.1 About This Command 116
- Loading a Partitioned Tape 117
- Unloading a Partitioned Tape 117
- 6.2 Field Definitions 118
- Byte 04, Bit 0 - Load 119
- 6 LOAD/UNLOAD (1Bh) 120
- LOCATE (2Bh) 121
- 7.1 About This Command 122
- 7 LOCATE (2Bh) 123
- 7.2 Field Definitions 124
- Byte 08 - Partition 125
- Byte09,Bit6-VendorUnique 126
- EOD Detected 127
- PEOT or PEOP Encountered 128
- Unrecoverable Error 129
- Illegal Requests 129
- LOG SELECT (4Ch) 131
- 8.1 About This Command 132
- 8 LOG SELECT (4Ch) 133
- 8.2 Field Definitions 134
- 8.3 Parameter List Header 136
- 8.4 Log Parameters 137
- Byte 02, Bit 1 – Reserved 140
- Byte 03 – Parameter Length 141
- Other Errors 142
- LOG SENSE (4Dh) 145
- 9.1 About This Command 146
- 9.2 Field Definitions 146
- Bytes 03 and 04 – Reserved 147
- 9 LOG SENSE (4Dh) 148
- 9.3 Parameter List Header 149
- 9.4 Supported Log Pages Page 150
- (Page Code=00h) 150
- 9.5 Log Parameter Data Blocks 151
- (Page Codes=02h and 03h) 151
- Total Rewrites 154
- Total Errors Corrected 154
- Total Times Errors Processed 154
- Total Bytes Processed 155
- Total Unrecoverable Errors 155
- Total Rereads 155
- MODE SELECT (15h) 157
- MODE SENSE (1Ah) 157
- 10.1 About These Commands 159
- Byte 04 - Allocation Length 165
- Byte 00 - Mode Data Length 170
- No tape loaded 171
- 10.6 Block Descriptor 173
- 10.7 Vendor-Unique Parameters 177
- (Non-Page Format) 177
- Byte 01, Bit 0 - 112m 179
- Byte 02 - Motion Threshold 179
- Byte 03 - Reconnect Threshold 180
- Byte 04 - Gap Threshold 180
- (Page Code=01h) 181
- Byte 03 - Read Retry Count 182
- Byte 08 - Write Retry Count 183
- (Page Code=02h) 184
- Byte 02 - Buffer Full Ratio 185
- Byte 03 - Buffer Empty Ratio 185
- Byte 01 - Page Length 187
- 10.11 Data Compression Page 189
- (Page Code=0Fh) 189
- Field Definitions 190
- Decompression) 192
- (Page Code=10h) 193
- Byte 03 - Active Partition 196
- (MODE SELECT) 204
- (Page Code=20h) 207
- Byte 02, Bit 5 - ND 208
- Byte 03, Bit 0 - 112m 211
- Byte 04 - Motion Threshold 211
- Byte 05 - Gap Threshold 211
- (Page Code=21h) 212
- (Page Code=22h) 214
- 10.18 Tape Format Examples 217
- Writing 8500c Format Tapes 218
- Reading 8500c Format Tapes 219
- Writing 8500 Format Tapes 220
- EXB-8205) 221
- Reading 8200 Format Tapes 223
- PREVENT/ALLOW 225
- MEDIUM REMOVAL 225
- 11.1 About This Command 226
- 11.2 Field Definitions 227
- READ (08h) 229
- 12.1 About This Command 230
- 12.2 Field Definitions 230
- Byte 01, Bit 0 - Fixed 231
- Filemark Detected 232
- Transfer Length Incorrect 237
- Compression Errors 239
- 12 READ (08h) 240
- READ BLOCK LIMITS 241
- 13.1 About This Command 242
- 13.2 Field Definitions 242
- 13.3 Read Block Limits Data 242
- READ BUFFER (3Ch) 243
- 14.1 About This Command 244
- 14.2 Field Definitions 244
- Hardware or SCSI Bus Error 245
- Allocation Length Incorrect 245
- 14 READ BUFFER (3Ch) 246
- READ POSITION (34h) 247
- 15.1 About This Command 248
- 15.2 Field Definitions 248
- 15.3 Read Position Data 249
- Byte 01 - Partition Number 250
- 15 READ POSITION (34h) 251
- RECEIVE DIAGNOSTIC 253
- RESULTS (1Ch) 253
- 16.1 About This Command 254
- 16.2 Field Definitions 255
- Diagnostic Page 256
- Bytes02and03-PageLength 257
- Partial Memory Dump 258
- 16.5 Receiving a Trace Dump 259
- RELEASE UNIT (17h) 261
- 17.1 About This Command 262
- 17.2 Field Definitions 262
- REQUEST SENSE (03h) 263
- 18.1 About This Command 264
- 18.2 Field Definitions 264
- 18.3 Extended Sense Bytes 265
- 18 REQUEST SENSE (03h) 266
- Table 18-1 Sense Key values 267
- Byte 09 - Log Parameter Code 269
- Byte 10 - Reserved 269
- Bytes 14 and 15 - Reserved 270
- Byte 22 - Reserved 273
- Sense Byte Pending Status 274
- RESERVE UNIT (16h) 275
- 19.1 About This Command 276
- 19.2 Field Definitions 276
- REWIND (01h) 277
- 20.1 About This Command 278
- 20.2 Field Definitions 279
- 20 REWIND (01h) 280
- SEND DIAGNOSTIC 281
- 21.1 About This Command 282
- 21.2 Field Definitions 283
- 21.3 Diagnostic Tests 284
- 21.4 Test Descriptions 285
- Setup for Test 100 286
- Setup for Test 101 287
- Setup for Test 110 287
- Setup for Test 111 288
- 22.1 About This Command 290
- 22.2 Field Definitions 291
- Bytes 02 through 04 - Count 292
- Setmark Detected (EXB-8505) 294
- EOD (Blank Tape) Detected 295
- PBOT or PBOP Encountered 297
- TEST UNIT READY 299
- 23.1 About This Command 300
- 23.2 Field Definitions 300
- VERIFY (13h) 301
- 24.1 About This Command 302
- 24.2 Field Definitions 302
- 24 VERIFY (13h) 303
- Verification Length Incorrect 308
- 25.1 About This Command 312
- 25.2 Field Definitions 312
- 25 WRITE (0Ah) 313
- 25.3 Tape Positioning 314
- 25.4 Data Buffering 315
- LEOT or LEOP Encountered 316
- Important 318
- WRITE BUFFER (3Bh) 325
- 26.1 About This Command 326
- 26 WRITE BUFFER (3Bh) 327
- 26.2 Field Definitions 328
- Sequence 329
- Microcode Not Valid 329
- Fatal Load Error 330
- Aborted Command 330
- Illegal Request 330
- WRITE FILEMARKS 331
- 27.1 About This Command 332
- 27.2 Field Definitions 332
- Byte 01, Bit 0 - Immed 333
- Byte 05, Bit 7 - Short 333
- 27.3 Tape Positioning 334
- What are EEPROM Options? 338
- Requesting EEPROM Options 338
- How to Use This Appendix 339
- Using the Tables 340
- Appendix A EEPROM Options 341
- Data integrity 342
- MEDIUM REMOVAL Default 345
- SENSE Data 364
- MODE SENSE 367
- Directory Support 370
- Overview of Directory Support 371
- Appendix B Directory Support 372
- Converting EXB-8200SX Drivers 373
- DIRECTORY PAD 374
- 1. Issue READ 375
- POSITION 375
- 2. Store First Block 375
- Location data 375
- 2. Write the 379
- 2. Search 381
- 1. Issue 381
- ...PADMASTER DIR 381
- Data Cartridge 383
- Capacities 383
- EXATAPE Capacities 384
- Autosizing of Data Cartridges 386
- SCSI Bus Message 387
- Processing and Error 387
- Recovery 387
- Initial Phase:Selection 391
- Transition to: Message Out 391
- Abort All others 391
- Identify 391
- CDBProcessing 394
- Command Phase 395
- ExtendedMessage Processing 398
- (message bytesout) 398
- (message bytesin) 400
- Command) 401
- Commands) 403
- Complete) 410
- Message In 413
- REQUEST SENSE Information 416
- Sense Key = 2h (Not Ready) 417
- Sense Key = 3h (Medium Error) 418
- Sense Key = 7h (Data Protect) 421
- Sense Key = 8h (Blank Check) 421
- Sense Key = 9h (EXABYTE) 421
- Fault Symptom Codes 423
- Table E-13 FaultSymptomCodes 424
- Error Recovery Procedures 430
- Glossary 431
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