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SCSI Commands
5-202 Quantum DLT 8000 Tape System
RESERVE UNIT (6) Command (16h) (continued)
Table 5–90 RESERVE UNIT (6) Command Data — Field Descriptions
Field Name Description
3rdPty The third party reservation option for RESERVE UNIT (6) allows an
initiator to reserve a logical unit for another SCSI device. This option is
intended for systems that use COPY, and is implemented by the tape
drive.
If set to 1, logical unit is reserved for the SCSI device whose ID
appears in the Third Party Device ID field. The tape drive ignores any
attempt made by any other initiator to release the reservation and
returns a GOOD status.
If set to 0, no third party reservation is requested and device is
reserved for the initiator that issued the CDB.
Third Party Device ID If 3rdPty is set to 1 (indicating that an initiator has reserved the logical
unit for another SCSI device), this field contains the ID number of that
SCSI device for which the reservation was made.
A reservation via the RESERVE UNIT (6) command remains in effect until one of the
following conditions is met:
• The initiator that made the reservation sends another RESERVE UNIT (6)
command.
• The tape drive is released via a RELEASE UNIT (6) command from the same
initiator.
• A BUS DEVICE RESET message is received from any initiator.
• A hard reset occurs.
The occurrence of the last two conditions is indicated by the drive returning a CHECK
CONDITION status, sense key of UNIT ATTENTION on the next command following
the condition. It is not an error to issue a RESERVE UNIT (6) command to a drive that
is currently reserved by the requesting initiator.
If the logical unit has previously been reserved by another initiator, the target returns a
RESERVATION CONFLICT status.
If, after honoring the reservation, any other initiator attempts to perform any command
except INQUIRY, REQUEST SENSE, or RELEASE UNIT (6), the command is rejected
with a RESERVATION CONFLICT status. A RELEASE UNIT (6) command issued by
another initiator is ignored by that logical unit.
- 8000 Tape System 1
- Product Manual 1
- Table of Contents 10
- REVISION HISTORY 27
- Revision History 28
- Quantum DLT 8000 Tape System 28
- ABOUT THIS MANUAL 33
- CONVENTIONS 35
- FOR MORE INFORMATION 35
- READER COMMENTS 35
- About This Manual 36
- Chapter 1 37
- 1.3 SPECIFICATIONS 38
- 1.3.4 Reliability (Projected) 41
- 1.3.5 Physical Specifications 41
- 1.3.7 Operating Air Velocity 43
- 1.3.9 Altitude 45
- 1.3.10 Acoustic Emissions 46
- 1.3.12 Power Requirements 47
- 1.3.13 Current Requirements 48
- TAPE SYSTEM 55
- 2.2.1 Setting the SCSI ID 58
- 2.2.2 Setting TERM PWR 60
- Front Bezel 61
- 2.3.1 Selecting SCSI ID 71
- SCSI Connectors (2) 72
- 220 / 240 V 74
- AC Power Cord Connector 75
- 2.4 The Tape Cartridge 76
- 2.4.4 Loading a Cartridge 82
- 2.4.5 Unloading a Cartridge 84
- 2.5.1 Unload Button 88
- 2.5.3 Selecting Density 89
- 2.9 Troubleshooting 99
- SCSI DESCRIPTION 103
- 3.2 SCSI Commands 104
- SCSI Description 105
- 3.3 Signal States 107
- 3.4 SCSI Signals 109
- 3.4.2 Signal Bus Timing 110
- 3.5 SCSI Bus Phases 113
- Bus Free Sequence 114
- 3.5.2 ARBITRATION Phase 115
- Arbitration Sequence 115
- 3.5.3 SELECTION Phase 116
- Selection Sequence 116
- Selection Time-Out 117
- 3.5.4 RESELECTION Phase 117
- Reselection Sequence 117
- SCSI ID bit 118
- Reselection Time-Out 120
- 3.6 SCSI Bus Conditions 128
- 3.6.2 Reset Condition 129
- 3.6.3 Queued Unit Attentions 130
- Chapter 4 131
- MESSAGES 131
- Messages 132
- 4.2 Supported SCSI Messages 135
- 4.2.12 NO OPERATION (08h) 141
- SCSI COMMANDS 145
- SCSI Commands 146
- 5.1.1 SCSI Pointers 147
- 5.1.3 Status/Error Reporting 151
- (Continued) 153
- 5.3 ERASE Command (19h) 159
- 5.4 INQUIRY Command (12h) 161
- 5.6 LOCATE Command (2Bh) 179
- 5.7 LOG SELECT Command (4Ch) 181
- Page Code Page Description 183
- 02h Write Error Counter Page 183
- 03h Read Error Counter Page 183
- 32h Compression Ratio Page 183
- LOG PAGE HEADER 184
- LOG PARAMETERS 185
- (continued) 186
- 5.8 LOG SENSE Command (4Dh) 189
- Descriptions (continued) 196
- 5.8.5 TapeAlert Page (2Eh) 200
- TAPE ALERT LOG PAGE HEADER 200
- TAPE ALERT LOG PARAMETERS 201
- Descriptions 210
- 5.9.1 Mode Parameter List 217
- 5.9.8 TAPEALERT PAGE (1Ch) 237
- FORCEDENSITY parameter to 4 247
- 5.10.3 MODE SENSE Mode Pages 258
- Data Field Description 284
- 5.14 READ Command (08h) 304
- 5.16.2 Data Mode 311
- 5.16.3 Descriptor Mode 311
- 5.26 REWIND Command (01h) 353
- 5.28 SPACE Command (11h) 360
- 5.30 VERIFY Command (13h) 363
- 5.31 WRITE Command (0Ah) 364
- 5.32.2 Write Data Mode (010b) 368
- INFORMATION 373
- Appendix B 377
- B.2 Bugcheck Packets 378
- B.2.1 POST Failure Packets 379
- B.2.2 Event Log Packets 379
- UPDATING THE FIRMWARE 381
- 1. POST passed 383
- 2. The drive is unloaded 383
- THE LIBRARY PORT 387
- CARTRIDGES 389
- Cartridge 391
- SYSTEM SCSI COMMANDS 397
- DLT 7000 EMULATION FEATURE 399
- SCSI Bus Differences 403
- Front Panel Differences 405
- *81-60118-04 A01* 408
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