Quantum DLT 8000 Product Manual page 322

SCSI Commands
RELEASE UNIT (10) Command (57h) (continued)
Table 5–81 RELEASE UNIT (10) Command — Field Descriptions
Field
3rdPty
LongID
Third Party Device ID
Parameter List Length
Extent
Reservation Identification
NOTE: Assuming that the RELEASE UNIT (10) Command Descriptor Block is valid, the
drive always returns a GOOD status for this command. An actual release only
happens if the initiator has the unit reserved for itself or a third-party initiator.
5-178
Description
Third Party Release allows an initiator to release a logical
unit that was previously reserved. If the value in this field is
0, third party release is not requested. If 3rdPty = 1, then
the device server shall release the specified logical unit, but
only if the initiator ID, 3rdPty bit, and third party device ID
are identical when compared to the RESERVE command
that established the reservation.
If the Long ID bit is set to 1, the Parameter List Length is 8
and the eight bytes of the parameter list carry the device ID
of the third party device; the contents of the Third Party
Device ID in the CDB (byte 3) are ignored.
If the Third Party Device ID value that is connected with the
reservation release is smaller than 255, the LongID bit may
be 0 and the ID value sent in the CDB. If LongID bit = 0, the
Parameter List Length field also = 0. If the Third Party
Device ID value is greater than 255, LongID = 1.
Device servers that support device IDs greater than 255 will
accept commands with LongID = 1; device servers that do
not support IDs greater than 255 may reject commands
with LongID set = 1. Device ID formats are protocol-
specific.
The contents of this field specify the length, in bytes, of the
parameter list that will be transferred from the initiator to
the target.
The drive supports reservations only on entire logical units.
The value must be 0.
Any value in this field is ignored by the drive.
Quantum DLT 8000 Tape System