SCSI Description
5–166 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
RELEASE (10) Command (57h) (continued)Table 5–78 RELEASE (10) Command — Field Descriptions
Field Description
3rdPty 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.
LongID 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.
Third Party Device ID 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.
Parameter List Length The contents of this field specify the length, in bytes, of the
parameter list that will be transferred from the initiator to the target.
Extent The drive supports reservations only on entire logical units. The
value must be 0.
Reservation Identification Any value in this field is ignored by the drive.
NOTE: Assuming that the RELEASE 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.