HP C737990900 - Manual (Page 121)

Commands 121
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RELEASE UNIT 17h/57h
R ELEASE UNIT enables the host to release any reservation it may have on the
drive. Reserving a device is a way of ensuring exclusive access to that device
from a single initiator for the period of the reservation. The drive may be
reserved using a RESERVE command.
The 10-byte RELEASE UNIT command is supported by all drives. Its
functionality is the same as for the 6-byte command, but it also supports third-
party reservation.
Pre-Execution Checks:
Command Descriptor Block:
6-Byte
10-Byte
Illegal Field Deferred Error Unit Attention
7 6 5 4 3 2 1 0
0 Operation Code (17h)
1 Reserved (0) 3rd Pty Third-Party Device ID Rsvd(0)
2
Reserved (0)
4
5
Control
3rdPty This bit is always zero because third-party reservation is not supported.
Third-Party Device ID This bit is always zero because third-party reservation is not supported.
7 6 5 4 3 2 1 0
0 Operation Code (57h)
1 Reserved (0) 3rd Pty Reserved (0) LongID Rsvd(0)