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SCSI Commands

5-178 Quantum DLT 8000 Tape System

RELEASE UNIT (10) Command (57h) (continued)

Table 5–81 RELEASE UNIT (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 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.

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Quantum DLT 8000 Manual Página 322