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SCSI Commands
5-204 Quantum DLT 8000 Tape System
5.25 RESERVE UNIT (10) Command (56h)
The RESERVE UNIT and the RELEASE UNIT commands are used for contention
resolution in multiple-initiator systems. The RESERVE UNIT (10) command is a 10-byte
command that is used to reserve a logical unit. The RESERVE UNIT (10) Command
Descriptor Block is shown in Figure 5-92, and the data fields are described in Table 5-91.
If RESERVE UNIT (10) is used, then RELEASE UNIT (10) is also used.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (56h)
1 Reserved 3rdPty Reserved LongID Extent
2 Reservation Identification
3 Third Party Device ID
4 - 6 Reserved
7 - 8
(MSB)
Parameter List Length
(LSB)
9 Unused Reserved Flag Link
Figure 5–92 RESERVE UNIT (10) Command Descriptor Block — Data Format
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