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Page 146 DDS-4 SCSI Interface Manual, Rev. B
RESERVE UNIT (16h / 56h)
The RESERVE UNIT command reserves the drive for exclusive use of the
requesting Initiator or for the exclusive use of third party specified SCSI device.
Note: The 6-byte version of the RESERVE UNIT command uses opcode
16h; the 10-byte version uses opcode 56h. We recommend using the 10-
byte Reserve Unit Command since the older 6-byte command can only
specify a Device ID in the range of 0 to 7, whereas the drive supports a
Device ID in the range of 0 to 15.
The drive reservation once established, remains in effect until occurrence of one of
the following:
• Another RESERVE UNIT command arrives from the same Initiator that
requested the current reservation (for itself or for a third party). The new
reservation supersedes the current one and may be the same as the current
one. Redundant use of the command is not considered an error.
• A RELEASE UNIT command arrives from the same Initiator that requested the
current reservation. The drive returns to unreserved mode.
• A Bus Device Reset Message arrives from any Initiator.
• A Reset condition occurs.
• Firmware is updated.
When the drive is reserved, it returns Reservation Conflict Status in response to any
and all commands received from excluded Initiators. An exception to this is in
response to the RELEASE UNIT command and in response to a subsequent
RESERVE UNIT command from the original reservation requester. Also, see the
RELEASE UNIT command. In addition, INQUIRY, REQUEST SENSE, PREVENT
MEDIUM REMOVAL (with a prevent bit of zero), and RELEASE UNIT commands
will be accepted from any initiator.
RESERVE UNIT Command Descriptor Block
6-byte version
The following table shows the layout of the 6-byte CDB.
Byte
Bits
7 6 5 4 3 2 1 0
0 0 0 0 1 0 1 1 1
1 0 0 0 3rd Pty | 3rd Pty ID 0
2 0 0 0 0 0 0 0 0
3 0 0 0 0 0 0 0 0
4 0 0 0 0 0 0 0 0
5 vendor unique* 0 0 0 0 Flag Link
* This vendor-unique field is reserved and must be set to zero.
Note: The drive also supports the SCSI-3 10-byte Reserve Unit Command.
We recommend using the 10-byte Reserve Unit Command since the older
6-byte command can only specify a Device ID in the range of 0 to 7,
whereas the drive supports a Device ID in the range of 0 to 15.
- Contents 5
- Commands 34 6
- Introduction 13
- SCSI Interface Description 14
- Signal Descriptions 15
- Command Set Description 16
- General features 17
- SCSI Bus Protocol 18
- Waiting and Control Phases 19
- Figure 2-1 20
- Figure 2-2 20
- Select With Attention 22
- Identify Message 22
- Information Transfer Phases 23
- Figure 2-4 24
- Synchronous Data Transfer 25
- Command Phase 26
- Data Phase 27
- Status Phase 27
- Message Phase 27
- Command Descriptor Block 28
- Logical Unit Support 29
- Attention Condition 36
- Reset Condition 36
- Unit Attention Condition 36
- Buffered Mode 37
- Immediate Function 37
- Residual Length Function 37
- SCSI Memory Address Pointers 39
- Early Warning Function 39
- Error Reporting 40
- Autoloader Operation 41
- General Operation 43
- Loading and Initialization 43
- Front Panel Operation 44
- Cassette Selection 44
- Automatic Loading Mode 44
- Magazine Ejection 45
- Stray Tape Recovery 45
- Commands 46
- Conventions 47
- ERASE (19h) 49
- INQUIRY (12h) 53
- Standard INQUIRY Data Format 54
- LOAD/UNLOAD (1Bh) 57
- LOCATE (2Bh) 59
- LOCATE and the BT Bit 60
- LOG SELECT (4Ch) 62
- Use of the PC Bits 63
- LOG SELECT Parameter Data 64
- LOG SENSE (4Dh) 69
- Using Page Control Bits 71
- Log Sense Pages 72
- Page Header 73
- MODE SELECT (15h) 85
- MODE SELECT Parameters 86
- Completion Status 100
- MODE SENSE (1Ah) 101
- MODE SENSE Parameters 103
- Mode Page Format 105
- READ (08h) 117
- READ BLOCK LIMITS (05h) 122
- READ DATA BUFFER (3Ch) 124
- READ DATA BUFFER Header 125
- Element Status Data 126
- Element Status Data Header 127
- READ POSITION (34h) 131
- READ POSITION Data Format 132
- RELEASE UNIT (17h / 57h) 138
- REPORT DENSITY SUPPORT (44h) 140
- REQUEST BLOCK ADDRESS (02h) 143
- REQUEST SENSE (03h) 145
- Definition of Sense Keys 147
- RESERVE UNIT (16h / 56h) 158
- REWIND (01h) 161
- SEEK BLOCK (0Ch) 162
- SEND DIAGNOSTIC (1Dh) 164
- SPACE (11h) 166
- Space-by-Count Functions 167
- Space and the RSMK Bit 168
- TEST UNIT READY (00h) 170
- VERIFY (13h) 172
- WRITE (0Ah) 174
- WRITE DATA BUFFER (3Bh) 176
- WRITE FILEMARKS (10h) 179
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