Quantum LTO 2U Instrucciones de operaciones Pagina 35
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JULY 2007 MAGNUM 224, MAGNUM 448, STORAGELIBRARY T24, OR STORAGELOADER 2U
2-11
SCSI COMMAND PROTOCOL
The field description, “This field not supported by the library,” indicates
that the field is supported by the SCSI-3 standards, but has not been
defined in the Tandberg Data implementation of the command. These
fields are reserved for future enhancements. The library ignores these
fields and does not check for illegal values.
The vendor unique portion of the Control byte (as indicated in the SCSI
standard) is defined for each specific command, if used. The library does not
support linked commands or recognize the Flag bit.
Fields containing only one bit are usually referred to as the name bit instead
of the name field.
Numbers that are not immediately followed by lower-case b or h are decimal
values.
Numbers immediately followed by lower-case b (nnb) are binary values.
Numbers or upper case letters immediately followed by lower-case h (nnh)
are hexadecimal values.
2.2.3 COMMAND STATUS
The library sends one status byte to the initiator at the completion of a
command. The status byte is formatted as follows:
Ta b l e 2 - 2 contains a summary of the status bytes used by the library.
Note: The library may go to the Bus Free phase without reporting status in
response to a command sequence. If this happens, immediately issue a
REQUEST SENSE (03h) command to determine the cause of the
unexpected disconnect.
Bit
Byte
7 6 5 4 3 2 1 0
00 Reserved Status Byte Code
Table 2-2 SCSI command status bytes supported by the library
Status
Hex
Value
Description
Good 00h Indicates that the library successfully completed the operation specified
by the CDB.
Check Condition 02h Indicates an error, exception, or abnormal condition that has caused
sense information to be set.
Busy 08h Indicates that the library is unable to accept a command from an initiator.
Reservation Conflict 18h Indicates that the library is reserved by another initiator.
- 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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