Release (10)
96122 • Revision: F Chapter 6 SCSI Commands 205
Release (10)
The 10-byte Release command (57h) enables the initiator to release unit
reservations of the library as set using a previous Reserve command and optionally
to perform a release for a third party initiator.
Performing a unit release of a library that has no active reservations is not
considered an error. Only the initiator that performed the reservation or the third
party for which the reservation was made can release the reservation. If another
initiator attempts to release a unit reservation, the library returns good status, but
does not release the reservation.
TABLE 6-79 Release (10) Command
Byte
Bit
76543210
0Operation Code (57h)
1 Ignored 3rdpty Reserved (0h) LongID
(0)
Obsolete
2 Reserved (00h)
3Third Party Device Id
4-6 Reserved (00h)
7
to
8
(MSB)
Parameter List Length
(LSB)
9 Control Byte (00h)
Release (10) Command Definitions:
3rdpty This field indicates whether the reservation is on behalf of a third party or not.
■ 0 = The reservation is on behalf of the calling requester.
■ 1 = The reservation is on behalf of a specified Third party Device Id.
LongID The LongID field indicates whether device IDs greater than 255 are required.
The library only accepts a value of 0.
LongIDs are not supported.
Third Party Device ID The ID of the third Party device.
Parameter List Length This field indicates the length in bytes of the Parameter List that follows the
command.
Ignore this field if the Element bit is not set.
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