Fujitsu MAA3182FC Series Manual page 219

The IDD is reserved by this command for the INIT which issued this command.
The values specified in bytes 2 to 4 of the CDB have no meaning and are disregarded, but it is
preferable that the INIT specify X'00' in these bytes.
Also, the value specified in CDB byte 3 to 4 reports CHECK CONDITION status "05-24-00"
except for X"00" is specified.
(1) Logical unit reserve function
This command reserves the entire IDD (logical unit) for use as a special FC device. The
reserve state established by this command is maintained until any one of the following
conditions occurs.
1) The reserve condition is changed by the INIT that issued this command (Superseding Reserve).
2) Reserve is released by a RELEASE command from the INIT that issued this command.
3) Receiving TARGET RESET message from any INIT.
4) Receiving LIP (y, x).
5) Switching the IDD's power off or on.
When an IDD is reserved for any FC device, if this command is issued by an INIT that doesn't
have the "Reserve Right" for that IDD, this command is terminated with a RESERVATION
CONFLICT status. See item (3) concerning the "Reserve Right."
After the Reserved status is established, a command issued by an INIT other than the FC device that
reserved the IDD is rejected, except an INQUIRY, REQUEST SENSE or RELEASE command, and
a RESERVATION CONFLICT status is reported to the INIT that issued that command. A
RELEASE command is the release operation specified in a RELEASE command issued to the IDD
by a FC device which does not have the Reserve Right is disregarded.
(2) Reserve right and third party reserve function
The third party reserve function is not supported in the FC, so if a value other than "0" is set in
the "3rd Pty Dev ID" field, a CHECK CONDITION status "05-24-00" is reported without this
command being executed.
In order to release the reserve status, it is necessary for the INIT which issued this command to
issue the RELEASE command (shown in item 4.1.12) or the RELEASE EXTENDED
command (shown in item 4.1.13).
(3) Changing the reserve conditions (Superseding Reserve)
This is only permitting the execution of multiple RESERVE commands and the initially
execute reserve state is held only.
•
Reserve right
Refer to Subsection 4.1.10.
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