Dell PowerVault TL2000 - Manual (Page 80)

RELEASE 10 (57h)
The RELEASE 10 command is used to release a previously reserved logical unit. This library supports
Third-Party reservation. Third-Party release allows an application client to release a logical unit that was
previously reserved using third party reservation.
Bit 7 6 5 4 3 2 1 0
Byte
0 Operation Code (57h)
1 LUN 3rdPty Reserved LongID Reserved
2 Obsolete
3 Third Party Device ID
4 Reserved
5 Reserved
6 Reserved
7 (MSB) Parameter List Length
8 (LSB)
9 Control
Field descriptions:
LongID:
Device IDs greater than 255 are not supported, therefore setting of LongID will result in a Check
Condition status. The Sense Key will be set to ILLEGAL REQUEST and the sense data to
INVALID FIELD IN CDB.
3rdPty:
If the third party (3rdPty) bit is zero, then a third-party release is not requested. If the 3rdPty bit is
zero then the LongID and Parameter List Length field shall be ignored. If the 3rdPty bit is one then
the library shall release the reservation, but only if the initiator ID and Third-Party Device ID are
identical when compared to the RESERVE command that established the reservation.
Third-Party Device ID:
This field provides the Device ID for the third party when 3rdPty bit is set.
3-66 TL2000 and TL4000 SCSI Reference