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Quantum DLT 8000 Tape System 4-1
Chapter 4
MESSAGES
The SCSI message system allows communication between an initiator and the drive for
interface management and command qualification. Messages can be originated by
either the initiator or the drive. This section contains a detailed description of the
messages supported by the disk drives.
4.1 Message Format
A message can be one or more bytes in length. One or more messages can be sent during
a single MESSAGE phase, but a message cannot be split over MESSAGE phases. The
initiator is required to end the MESSAGE OUT phase (by negating ATN) when it sends
certain messages that are identified in Table 4–2.
When a connection to the drive is established (i.e., the drive is selected with ATN
asserted), the first message byte passed by the initiator must be either an IDENTIFY,
ABORT, or BUS DEVICE RESET message. If not, the drive discards the message, saves
no status information, and goes to the BUS FREE phase.
If an initiator supplies an unsupported message (for example, COMMAND COMPLETE
or a reserved or undefined message code), the drive returns a MESSAGE REJECT
message and continues where it left off (possibly returning to MESSAGE OUT if ATN is
raised).
The first byte of the message, as defined in Table 4–1, determines the format of the
message.
Table 4–1 Message Format
Message Code Message
00h One-byte message (COMMAND COMPLETE)
01h Extended message
02h – 1Fh One-byte message
20h – 2Fh Two-byte message
40h – 7Fh Reserved
80h – FFh One-byte message (IDENTIFY)
- 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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