Quantum DLT 7000 Manuel Page 110
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- Table des matières
- DEPANNAGE
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
SCSI Commands
5-6 Quantum DLT 7000 Tape System
Bit
Byte
7 6 5 4 3 2 1 0
5 Vendor Specific Reserved Flag Link
Figure 5–2 Command Descriptor Block Control Field - Data Format
Table 5–3 Command Descriptor Block Control Field - Field Descriptions
Field Description
Vendor Specific Bits These bits must be 0.
Flag Bit The Flag bit is used in conjunction with the Link bit to notify the initiator in
an expedient manner that a command has been completed.
Link Bit A Link bit set to 1 indicates that the initiator requests continuation of a task
(an I/O process) across two or more SCSI commands.
If the Link bit is 1 and the Flag bit is 0, and the task completes successfully,
the drive continues the task and returns a status of INTERMEDIATE and a
LINKED COMMAND COMPLETE message.
If the Link bit and the Flag bit within a Control word are both set to 1, and
the drive completes a command with a status of INTERMEDIATE, the drive
returns a LINKED COMMAND COMPLETE message (with Flag).
5.1.3 Status/Error Reporting
SCSI message-level errors are communicated by messages that are defined
specifically for that purpose (for example, MESSAGE PARITY ERROR,
MESSAGE REJECT). Message-level errors are also handled by drive-managed
retries. Refer to Chapter 4 for more detailed message-handling information.
SCSI command-level errors are communicated by a status code that is returned
by the drive during the STATUS phase. This phase occurs at the end of each
command, unless the command is terminated by one of the following events:
• ABORT message
• BUS DEVICE RESET message
• Hard reset condition
• Unexpected disconnect
- DLT™7000 Tape System 1
- Product Manual 1
- TABLE OF CONTENTS 7
- REVISION HISTORY 19
- Revision History 20
- Quantum DLT 7000 Tape System 20
- ABOUT THIS MANUAL 21
- CONVENTIONS 23
- FOR MORE INFORMATION… 23
- READER COMMENTS 24
- Chapter 1 25
- 1.2 PRODUCT FEATURES 26
- 1.3 PRODUCT SPECIFICATIONS 26
- 1.3.2 Interface Type 27
- 1.3.3 Storage Capacity 27
- 1.3.4 Reliability (Projected) 27
- 1.3.5 Performance Data 28
- 1.3.7 Power Requirements 32
- 1.3.8 Current Requirements 33
- 1.3.14 Conducted Emissions 36
- 1.3.15 Radiated Emissions 37
- 1.3.16 Susceptibility 37
- Chapter 2 39
- HARDWARE IMPLEMENTATION 39
- 2.1.1 Safety Precautions 40
- 2.1.2 Handling 40
- Hardware Implementation 43
- 4-Pin Power Connector 47
- Drive Back 47
- SCSI-2 Connector 47
- SCSI ID Pushbutton 51
- Power Switch 51
- Power Connector 51
- SCSI Connector (2) 51
- 220 / 240 V 53
- Table 2–6 LED Functionality 55
- 2.4.2 Selecting Density 59
- 2.5 POWER ON SELF TEST (POST) 61
- 2.6 TROUBLESHOOTING 63
- Chapter 3 65
- SCSI DESCRIPTION 65
- 3.2 SCSI COMMANDS 66
- SCSI Description 67
- 3.3 SIGNAL STATES 68
- 3.3.2 SCSI ID Bits 69
- 3.4 SCSI SIGNALS 70
- 3.4.2 Signal Bus Timing 71
- 3.5 SCSI BUS PHASES 74
- Messages Received by Drive: 75
- 3.5.2 ARBITRATION Phase 76
- 3.5.3 SELECTION Phase 77
- The initiator: 78
- The drive: 78
- 3.5.4 RESELECTION Phase 79
- 3.6 SCSI BUS CONDITIONS 88
- 3.6.2 Reset Condition 89
- 3.6.3 Queued Unit Attentions 90
- Chapter 4 91
- MESSAGES 91
- Messages 94
- 4.2 SUPPORTED SCSI MESSAGES 95
- 4.2.12 NO OPERATION (08h) 101
- • After a power cycle 103
- Chapter 5 105
- SCSI COMMANDS 105
- SCSI Commands 106
- 5.1.1 SCSI Pointers 107
- 5.1.3 Status/Error Reporting 110
- 5.2 SCSI COMMAND DESCRIPTIONS 116
- 5.3 ERASE COMMAND (19h) 118
- 5.4 INQUIRY COMMAND (12h) 119
- 5.6 LOCATE COMMAND (2Bh) 134
- 5.7 LOG SELECT COMMAND (4Ch) 136
- 5.7.2 Operation of LOG SELECT 138
- 5.8 LOG SENSE COMMAND (4Dh) 143
- • A page is not supported 146
- • The SP bit is set to 1 146
- • PPC bit set to 1 146
- (continued) 150
- 5.8.5 TapeAlert Page (2Eh) 154
- 0000h – 000Fh) 164
- 0000h, 0001h, or 0002h) 167
- 5.9.1 Mode Parameter List 171
- 5.9.8 TapeAlert Page (1Ch) 191
- 5.10.3 MODE SENSE Mode Pages 212
- 5.12 READ COMMAND (08h) 232
- READ Command (08h) 233
- 5.14.2 Data Mode 239
- 5.14.3 Descriptor Mode 240
- • A hard reset occurs 260
- 5.20 REWIND COMMAND (01h) 261
- 5.22 SPACE COMMAND (11h) 267
- 5.24 VERIFY COMMAND (13h) 270
- 5.25 WRITE COMMAND (0Ah) 272
- 5.26.2 Write Data Mode (010b) 275
- Appendix A 279
- INFORMATION 279
- Appendix B 283
- B.2 BUGCHECK PACKETS 284
- B.2.2 Event Log Packets 285
- Appendix C 287
- UPDATING THE FIRMWARE 287
- • Examines the data 289
- • Power failure 290
- Appendix D 293
- THE TAPE CARTRIDGE 293
- Reel Lock Opening 296
- Spring-Loaded Hub 297
- WRITE-PROTECTION 300
- D.4 LOADING A TAPE CARTRIDGE 302
- *81-60000-06 A01* 312
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