ACL 4/52 Software Interface Guide
Document 6211225-03
Version 3.0
3-54
SCSI Interface
Release (17h)
The Release Command releases the library or elements that match the
specified release parameters.
Note
It is not an error to attempt to release the library if it is not currently
reserved by the requesting initiator. However, if the library is reserved
by another initiator, the library is not released.
Table 35: Release
Command
Logical Unit Number
The Logical Unit Number is 0. This field indicates which logical
unit the command should be sent to.
3rdPty and 3rd Party ID
The 3rd party release option for Release allows an initiator to
release a logical unit or elements that were previously reserved
using the 3rd party reservation option. If the 3rdPty bit is zero,
then the 3rd party release option is not requested and the
command will only release a unit or elements that were reserved
without 3rd party reservation. If the 3rdPty bit is one, the unit or
elements are released were originally reserved by the same
initiator using the 3rd party reservation option, and if the device is
the same SCSI device that was specified in the 3rd party device ID
(3rd Party ID) field.
Element and Reservation ID
The Element field specifies whether this command is an Element
or Unit Release. If the value is one, the command will Release all
elements reserved by the requesting initiator, that were reserved
with the same Reservation ID value as this release attempt and that
meet 3rd party release requirements, if applicable. If the value is
zero, the command will Release a reservation placed on this unit
by the requesting initiator that meets 3rd party release
requirements, if applicable.
Bit/Byte
7
6
5
4
3
2
1
0
0
Operation Code (17h)
1
Logical Unit Number
3rdPty
3rd Party ID
Element
2
Reservation ID
3
Reserved (00h)
4
Reserved (00h)
5
Unused
Reserved (00h)
Flag
Link
