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18-6
SCSI REFERENCE 1014826
CHAPTER 18—REQUEST SENSE (03h)
18.3.1 PRIORITIES OF SENSE BYTES
Multiple errors may occur during the processing of a single SCSI command.
The sense key reflects the last error that occurred. For example, if a message
error occurs after an unrecoverable hardware error, the library handles the
errors in the following manner:
The message error is reported.
A subsequent REQUEST SENSE command reports the hardware error.
The hardware error is preserved, and the next motion command issued by
any host terminates with Check Condition status.
18.3.2 SENSE BYTE PENDING STATUS
When the library reports Check Condition status in response to a command
from an initiator, the library retains the sense byte pending status, including
error information and Check Condition status for the initiator, until one of the
following occurs:
Error information is reset by a reset or power-on condition.
Error information is reset by the next command execution for the same
initiator.
18.4 COMMAND STATUS
The library returns a status byte after processing the REQUEST SENSE
command. This section describes when each type of status byte might be
returned.
Good
The library returns Good status when it is able to process the command
without errors.
Busy
The library never returns Busy status for the REQUEST SENSE command.
Reservation Conflict
The library never returns Reservation Conflict status for the REQUEST SENSE
command.
Check Condition
The library returns Check Condition status for the following reasons:
A reserved bit is set to 1 in the CDB.
A parameter in the CDB is invalid (see Table 18-2 for sense data).
Table 18-2 Invalid parameters in the READ ELEMENT STATUS CDB
Sense
Key
ASC ASCQ
SKSV
Bit
C/D
Bit
BPV
Bit
Bit
Pointer
Field
Pointer
Error
5h 24h 00h 1 1 1 — —
A reserved bit is set in the CDB. The
pointers point to the bit in error.
- EFERENCE 1014826 2
- ONTACTING 3
- ANDBERG DATA 3
- ORPORATION 3
- Contents 5
- SCSI REFERENCE 1014826 10
- ABOUT THIS MANUAL 17
- PRODUCT OVERVIEW 19
- 1.1.2 BACK PANEL COMPONENTS 20
- AGNUM 448 EMULATION MODES 24
- OVERVIEW OF THE LIBRARY 25
- SCSI DEVICE 25
- 2.1.1 ELEMENT TYPES 27
- 2.1.2 ELEMENT ADDRESSES 27
- Magnum 448 Element Addresses 29
- ELATIONSHIP TO THE SCSI BUS 31
- 2.2 SCSI COMMAND PROTOCOL 32
- OMMAND PROTOCOL 33
- 2.2.2 SCSI COMMAND FORMAT 34
- 2.2.3 COMMAND STATUS 35
- 2.2.4 COMMAND FORMAT ERRORS 36
- IMPLEMENTING SCSI 39
- OPERATIONS 39
- Disabling Sequential Mode 41
- Setting the Restart Option 41
- Setting the Loop Option 42
- Important 42
- ETTING ELEMENT ADDRESSES 43
- Element Addresses 45
- Element Occupied Status 46
- Bar Code Label Information 47
- 3.5 MOVING CARTRIDGES 48
- 3.7 PERFORMING DIAGNOSTICS 49
- Home Screen 50
- INITIALIZE ELEMENT 51
- STATUS (07h) 51
- 4.4 COMMAND STATUS 53
- STATUS WITH RANGE (37h) 55
- 5.4 COMMAND STATUS 58
- INQUIRY (12h) 59
- 6.3 WHAT THE LIBRARY RETURNS 60
- TANDARD INQUIRY DATA PAGE 61
- CODE 00h) 66
- Page Code – Byte 01 68
- Page Length – Byte 03 68
- 6.4 COMMAND STATUS 73
- LOG SELECT (4Ch) 75
- 7.3 COMMAND STATUS 76
- LOG SENSE (4Dh) 77
- 8.3 WHAT THE LIBRARY RETURNS 81
- 8.3.1 LOG PARAMETER FORMAT 82
- Parameter Length – Byte 03 83
- Parameter Value – Byte 04 90
- Command – Byte 04 91
- Fault Symptom Code – Byte 05 92
- Command Interface – Byte 06 93
- 8.4 COMMAND STATUS 94
- CHAPTER 8—LOG SENSE (4Dh) 96
- MODE SELECT (15h) 97
- 9.2.1 PARAMETER LIST HEADER 99
- Assigning Element Addresses 100
- ! Important 101
- HAT YOU SEND TO THE LIBRARY 103
- Page Length – Byte 01 104
- MaxStor – Byte 4, Bit 7 105
- Parameter Length – Byte 01 108
- Write Line 1 – Byte 02, Bit 3 108
- FixEnbl – Byte 02, Bit 0 109
- Auto – Byte 02, Bit 1 109
- 9.3 COMMAND STATUS 110
- MODE SENSE (1Ah) 113
- 10.3 WHAT THE LIBRARY RETURNS 115
- Mode Data Length – Byte 00 116
- HAT THE LIBRARY RETURNS 117
- CODE 1Eh) 119
- 10.4 COMMAND STATUS 130
- Check Condition 131
- CHAPTER 10—MODE SENSE (1Ah) 132
- MOVE MEDIUM (A5h) 133
- 11.4 COMMAND STATUS 137
- POSITION TO ELEMENT 139
- 12.3 COMMAND STATUS 140
- OMMAND STATUS 141
- PREVENT/ALLOW MEDIUM 143
- REMOVAL (1Eh) 143
- 13.3 COMMAND STATUS 144
- READ BUFFER (3Ch) 145
- 14.5 COMMAND STATUS 148
- CHAPTER 14—READ BUFFER (3Ch) 150
- READ ELEMENT STATUS 151
- 15.3 WHAT THE LIBRARY RETURNS 153
- 15.3.1 ELEMENT STATUS HEADER 154
- 15.3.2 ELEMENT STATUS PAGE 154
- Element Type Code – Byte 00 155
- PVolTag – Byte 01, Bit 7 155
- AVolTag – Byte 01, Bit 6 155
- 15.3.3 ELEMENT DESCRIPTORS 156
- Except – Byte 02, Bit 2 157
- TORAGE ELEMENT DESCRIPTOR 159
- Access – Byte 02, Bit 3 160
- Full – Byte 02, Bit 0 160
- SValid – Byte 09, Bit 7 161
- Invert – Byte 09, Bit 6 161
- 15.4 COMMAND STATUS 170
- RECEIVE DIAGNOSTIC 171
- RESULTS (1Ch) 171
- 16.3 WHAT THE LIBRARY RETURNS 172
- Bytes 02 and 03 – Page Length 173
- Page Code – Byte 00 173
- Page Length – Bytes 02 and 03 173
- Supported Log Pages – Byte 04 173
- Self Test – Byte 27 174
- 16.4 COMMAND STATUS 175
- RELEASE (17h OR 57h) 177
- 17.1 ABOUT THIS COMMAND 178
- 17.3 COMMAND STATUS 179
- REQUEST SENSE (03h) 181
- 18.3 WHAT THE LIBRARY RETURNS 183
- 18.4 COMMAND STATUS 186
- REQUEST VOLUME 187
- ELEMENT ADDRESS (B5h) 187
- 19.1 ABOUT THIS COMMAND 188
- 19.3 WHAT THE LIBRARY RETURNS 190
- 19.3.2 ELEMENT STATUS PAGE 191
- 19.3.3 ELEMENT DESCRIPTORS 192
- 19.4 COMMAND STATUS 204
- Reservation Conflict 205
- RESERVE (16h OR 56h) 207
- 20.1 ABOUT THIS COMMAND 208
- 20.3 COMMAND STATUS 209
- REZERO UNIT (01h) 211
- SEND DIAGNOSTIC (1Dh) 213
- DDITIONAL DIAGNOSTIC DATA 215
- ELF TEST PAGE (PAGE CODE F0h) 216
- 22.4 COMMAND STATUS 217
- SEND VOLUME TAG (B6h) 219
- ARAMETER LIST 221
- 23.4 COMMAND STATUS 222
- TEST UNIT READY (00h) 225
- WRITE BUFFER (3Bh) 227
- 25.4 COMMAND STATUS 230
- CHAPTER 25—WRITE BUFFER (3Bh) 232
- ERROR CODES 233
- IBRARY “FATAL” ERROR MESSAGES 243
- A.3 ERROR RECOVERY PROCEDURES 258
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