Release unit 17h/57h, Release unit 17h/57h 121, Pre-execution checks: command descriptor block – HP C737990900 User Manual
Page 121
Commands 121
Co
m
m
an
ds
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)