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2
SCSI Communication
This chapter provides an overview of how the Small Computer
System Interface (SCSI) is implemented for the EXB-8505 and
EXB-8205. It discusses the following topics:
SCSI commands supported by the CTS
Required format of SCSI commands
Command statuses supported by the CTS
SCSI bus messages supported by the CTS
Note: The ANSI Small Computer System Interface-2 (SCSI-2)
Specification provides detailed information about SCSI
physical characteristics. As described in that specification,
SCSI devices can be daisy-chained together using a common
cable. Both ends of the cable must be terminated. All signals
are common between all bus devices.
May 1994 EXB-8205 and EXB-8505
(Standard and XL)
2-1
- 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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