Hp C737990900 User Manual Page 38
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38 Commands—Introduction
Unit Attention Check
This checks if a UNIT ATTENTION condition exists for the host which sent the
command. If it does, the drive reports
CHECK CONDITION status with a sense
key of
UNIT ATTENTION. The remaining sense data will be set according to the
unit attention condition which exists. See Unit Attention Sense in the
description of the
REQUEST SENSE command on page 132.
Command Descriptor Block
A SCSI command descriptor block (CDB) is a sequence of 6, 10, 12 or 16
bytes sent by a host to a SCSI target with the bus in command phase. The CDB
tells the drive what action should be performed. The final byte is known as the
Control byte.
There are a number of fields in a CDB which are common to all commands.
These are shown in the following table.
7 6 5 4 3 2 1 0
0 Group Code Operation Code
1 Reserved (0)
2 (MSB)
Multi-Byte Parameter
n
-1 (LSB)
n Vendor Unique (0)
Reserved (0)
NACA(0) Flag (0) Link (0)
Group Code
and
Operation Code
The operation code uniquely identifies the command. The top three bits of the
operation code are known as the group code and these define the length of the
command descriptor block:
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Six-byte commands
Ten-byte commands
Ten-byte commands
Six-byte commands
Sixteen-byte commands
Twelve-byte commands
not supported
not supported
- 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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