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Commands 149
Commands
Space Specific Status:
If the drive fails to space either from a medium error or from some sort of non-
fatal drive error,
CHECK CONDITION status is reported. The sense key will be
set to
MEDIUM ERROR. Additional sense depends on the nature of the error.
The two most common additional sense code and qualifiers in this case will
be: 1100h (unrecovered read error) and 3B00h (sequential positioning error).
The drive implements the following priority scheme when a tape position point
is encountered:
■ If “blank media” is encountered during a space (in other words, the drive
attempted to space on an unformatted tape), the drive behaves as if EOD
was at BOM. It will then respond with
GOOD status to a request to space to
EOD, and with
CHECK CONDITION to any other forward spacing request.
Additional sense is set to 1403h (
End of data not found).
Count
■
When spacing over blocks or filemarks this field indicates how many blocks or marks
should be crossed. Spacing is forward (towards EOM) unless Count is negative (twos
complement) when the spacing is towards BOM.
■ When spacing to EOD the Count field is ignored.
■ When not spacing to EOD, if Count is zero, the SPACE command is treated as a null
operation. The logical position remains unchanged, and unwritten data is not flushed to
tape.
Lowest priority Blocks
Filemarks If the drive meets a filemark while spacing to a block
CHECK CONDITION is
reported. The Mark bit in the sense data is set, and the sense key is
NO SENSE.
Additional sense is 0001h (filemark encountered). The final position will be
before or after the filemark depending on whether the space was reverse or
forward.
EOD If the drive meets EOD while spacing to a block or mark,
CHECK CONDITION is
reported. The EOM bit in the sense data is set. The sense key is
BLANK CHECK and
additional sense is 0005h (EOD encountered).
BOM If the drive meets BOM while spacing, CHECK CONDITION is reported. The EOM
bit and Valid bit in the sense data are set to 1 and the information bytes set to the
total number of blocks or filemarks that remain to be spaced over (in other words,
the requested number minus the number that have been spaced over). The sense
key is
NO SENSE and additional sense is 0004h (BOT detected).
Highest priority EOM If the drive meets EOM while spacing,
CHECK CONDITION is reported. The EOM
bit in the sense data is set. The sense key is
MEDIUM ERROR and additional sense is
0002h (EOP/M detected).
- Edition 4, February 2003 1
- Revision History 2
- The Purpose of this Manual 3
- Related Documents 3
- Documentation Map 4
- Cartridges 5
- Interface 5
- Dealing with Errors 6
- Ultrium Features 6
- 1 Interface Implementation 13 9
- 2 Messages 25 10
- 3 Commands—Introduction 31 10
- 4 Commands 41 10
- Contents 11 11
- Glossary 165 12
- Index 169 12
- Interface Implementation 13
- Supported Messages 14
- Supported Commands 14
- SCSI Features 15
- Abort Handling 16
- Multi-Initiator Support 19
- Fibre Channel Operation 20
- Addresses 21
- Implications for Libraries 22
- Field Replaceable Units 23
- Messages 25
- 26 Messages 26
- Name Code Support 26
- Extended Message Support 27
- 30 Messages 30
- Commands—Introduction 31
- Command Details 32
- Pre-Execution Checks 32
- Deferred Error Check 33
- Diagnostic Status Check 33
- Fixed Bit Check 34
- Flag Link Check 34
- Illegal Command Check 34
- Illegal Field/Request Check 34
- Media Access Check 35
- Media Information Check 36
- Media Write Check 37
- Parameter List Check 37
- Reservation Check 37
- Command Descriptor Block 38
- CHECK CONDITION 39
- 40 Commands—Introduction 40
- ERASE 19h 42
- Erase Specific Status: 43
- INQUIRY 12h 44
- INQUIRY Data Pages 45
- Inquiry Data 46
- Inquiry Data Fields 47
- Vital Product Data Pages 49
- Unit Serial Number Page 50
- Device Identification Page 51
- Defined Identifiers 51
- Port Name (FC only) 52
- Device Name (FC only) 52
- Port Identifier (FC only) 53
- LOAD/UNLOAD 1Bh 55
- Load/Unload Specific Status: 56
- Loading a Cartridge 56
- Unloading a Cartridge 57
- LOCATE 2Bh 58
- Locate Specific Status: 59
- LOG SELECT 4Ch 60
- LOG SENSE 4Dh 62
- Log Page Format 63
- Supported Log Pages Page 64
- Write Error Counters Log Page 65
- Read Error Counters Log Page 66
- TapeAlert Log Page 67
- Tape Usage Log Page 69
- Tape Capacity Log Page 69
- Data Compression Log Page 70
- Performance Data Log Page 70
- MODE SELECT 15h/55h 72
- Mode Parameter Pages 74
- Mode Parameter Header 75
- 10-byte Header 76
- Header Fields 76
- Mode Block Descriptor 77
- Disconnect-Reconnect Page 79
- FC Drives 80
- Control Mode Page 81
- Control Mode Page Fields: 82
- Device Configuration Page 83
- Changeable Parameters: 84
- Unchangeable Parameters: 84
- Medium Partitions Mode Page 85
- (Partition Units) 86
- CHECK CONDITION with a sense 89
- -1 through -64 90
- MODE SENSE 1Ah/5Ah 91
- READ 08h 95
- GOOD status is returned 96
- Read Specific Status: 97
- READ ATTRIBUTE 8Ch 99
- CDB Fields: 100
- Commands 101
- MAM Attribute Data 103
- Attribute ID Values 104
- Medium Common Attributes 106
- Host Common Attributes 107
- Commands 109 109
- READ BLOCK LIMITS 05h 110
- READ BUFFER 3Ch 111
- Memory Sizes: 112
- Returned Data: 113
- READ POSITION 34h 115
- Returned Data Fields: 117
- Pre-Execution Checks: 119
- Command Descriptor Block: 119
- Specific Status: 119
- Data Returned 120
- RELEASE UNIT 17h/57h 121
- 10-Byte Only 122
- Release Unit Specific Status: 122
- REPORT DENSITY SUPPORT 44h 123
- Descriptor Blocks 124
- MODE SENSE command 125
- REPORT LUNS A0h 126
- REQUEST SENSE 03h 128
- Request Sense Data 129
- Returned Sense Data Fields: 130
- Sense Data Management 131
- Current Sense 132
- UNIT ATTENTION Sense 132
- DEFERRED ERROR Sense 133
- Write-Behind Deferred Errors: 134
- Bus Release Deferred Errors: 134
- Sense Keys 135
- Additional Sense Codes 136
- WRITE BUFFER command 139
- Error Codes 140
- RESERVE UNIT 16h/56h 141
- RELEASE UNIT command with 143
- REWIND 01h 144
- SEND DIAGNOSTIC 1Dh 145
- Data Required 146
- Specific Status 146
- Standard Self-Test 147
- SPACE 11h 148
- Space Specific Status: 149
- TEST UNIT READY 00h 151
- VERIFY 13h 152
- WRITE 0Ah 154
- Write Specific Status: 155
- Residue Information: 155
- WRITE ATTRIBUTE 8Dh 157
- Parameter List Format: 159
- WRITE BUFFER 3Bh 160
- Memory Sizes 162
- Commands 163 163
- WRITE FILEMARKS 10h 164
- Glossary 165
- 166 glossary 166
- 168 glossary 168
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