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SCSI Commands
5-164 Quantum DLT 8000 Tape System
READ BLOCK LIMITS Command (05h) (continued)
The READ BLOCK LIMITS data shown below is sent during the DATA IN phase of the
command. The command does not reflect the currently selected block size, only the
available limits. MODE SENSE is the command that returns the current block size.
Bit
Byte
7 6 5 4 3 2 1 0
0 Reserved *
1 - 3
(MSB)
Maximum Block Length
(LSB)
4 - 5
(MSB)
Minimum Block Length (0001h)
(LSB)
* In SCSI-3 configurations, Byte 0 appears as shown below:
0 Reserved Granularity
The Granularity field is described in the table below.
Figure 5–73 READ BLOCK LIMITS Data — Data Format
Table 5–73 READ BLOCK LIMITS Data — Field Descriptions
Field Name Description
Granularity (SCSI-3 Only) This field indicates the supported block size granularity. The DLT
8000 tape drive supports all block sizes n such that n minus the
minimum block length limit is a multiple of 2
x
(where
x
is the value in
the Granularity bits), and n is greater than or equal to the Minimum
Block Length Limit and less than or equal to the Maximum Block Size
Limit. For the DLT 8000 system, the content of the Granularity field is
1 (since block sizes must be a multiple of 2; 2
1
= 2).
For backward compatibility, the DLT 8000 will process requests that
do not meet Granularity criteria, except for Odd-byte Multiple Block
Fixed Block WRITE commands when connected to a Wide (16-bit)
SCSI bus.
Maximum Block Length The value in this field indicates the maximum block size. The tape
drive supports a maximum block length of 16,777,214 (16 MB-2) for
10, 15,20, 35, or 40 GB format.
Minimum Block Length The value in this field indicates the minimum block size. The tape
drive supports a minimum block length of 2 bytes.
- 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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