HP Q153090901 17h/57h, RELEASE UNIT

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:

Illegal Field			Deferred Error		Unit Attention
Command descriptor block:
6-byte
		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.

10-byte

	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

10-byte only

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.

Commands

RELEASE UNIT 17h/57h 135