Quantum 10K II - Manual (Page 260)

SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–193
5.36 RESERVE (10) Command (56h)
The RESERVE and the RELEASE commands are used for contention resolution in
multiple-initiator systems. The RESERVE command is used to reserve a logical unit.
If RESERVE (10) is used, then RELEASE (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 Control
Figure 5–90 RESERVE (10) Command Descriptor Block — Data Format