User's Manual

RELEASE UNIT
Table 70. Byte RELEASE UNIT Command
76543210
0 Operation Code (17h)
1 Logical Unit Number (0) 3rdPty Third Party Device ID (0) Element
2 Reservation Identification
3 Reserved
4 Allocation Length (0)
5 Control
Table 71. Byte Release Unit Command
76543210
0 Operation Code (57h)
1 Logical Unit Number (0) 3rdPty (0) LongID (0) Reserved
2 Reserved
3 Third Party Device ID (0)
4 Reserved
5 Reserved
6 Reserved
7
Parameter List Length(0)
8
9 Control
The RELEASE UNIT command removes a reservation made by a RESERVE UNIT
command. If there is an existing reservation from the same initiator with the same
parameters, then that reservation is removed and Good status is returned. It is not
an error to attempt to release a reservation that is not currently valid or is held by
another initiator. In this case, the drive returns Good status without altering any
reservation.
54 Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference