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RELEASE UNIT 17h/57h
Commands
135
RELEASE UNIT 17h/57h
RELEASE 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.
Pre-execution checks:
Command descriptor block:
6-byte
10-byte
10-byte only
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)
2 Reserved (0)
3 Third-Party Device ID
4
Reserved (0)
6
7 (MSB)
Parameter List Length
8 (LSB)
9 Control
3rd Pty 0 Third-party release is not requested.
1 The initiator requests third-party release. The value in the Third-Party
Device ID field is valid.