Fujitsu MAN3735 Manuale Utente
C141-E124-01EN
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3.1.11
RESERVE (16)
Bit
Byte
Byte
7
6
5
4
3
2
1
0
0
X‘16’
1
LUN
3rd Pty
3rd Pty Dev ID
0
2
u
u
u
u
u
u
u
u
3
u
u
u
u
u
u
u
u
4
u
u
u
u
u
u
u
u
5
0
0
0
0
0
0
Flag
Link
Together with the RELEASE command, this command controls exclusive access to the logical unit
(IDD) under a multi-initiator environment.
(IDD) under a multi-initiator environment.
The IDD is reserved by this command for the INIT which issued this command or for some other
SCSI device specified in the CDB.
SCSI device specified in the CDB.
The INIT which issues this command must notify the IDD of its own SCSI ID when the
SELECTION phase is executed.. When the INIT's ID cannot be specified, this command is
terminated with a CHECK CONDITION status (ILLEGAL REQUEST [=5] / Initiator's SCSI ID
not identified [=90-00]) without being executed. Also, 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.
SELECTION phase is executed.. When the INIT's ID cannot be specified, this command is
terminated with a CHECK CONDITION status (ILLEGAL REQUEST [=5] / Initiator's SCSI ID
not identified [=90-00]) without being executed. Also, 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.
(1)
Logical unit reserve function
This command reserves the entire IDD (logical unit) for use as a special SCSI device. The reserve state
established by this command is maintained until any one of the following conditions occurs.
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) A TARGET RESET message from any INIT.
4) A RESET condition.
5) Switching the IDD's power off or on.
2) Reserve is released by a RELEASE command from the INIT that issued this command.
3) A TARGET RESET message from any INIT.
4) A RESET condition.
5) Switching the IDD's power off or on.
When an IDD is reserved for any SCSI 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."
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 SCSI 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. The INQUIRY
and REQUEST SENSE commands are executed normally even when the IDD is reserved for use by
another SCSI device. Also, a RELEASE command is terminated with a GOOD status, but the release
operation specified in a RELEASE command issued to the IDD by a SCSI device which does not have
the Reserve Right is disregarded.
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. The INQUIRY
and REQUEST SENSE commands are executed normally even when the IDD is reserved for use by
another SCSI device. Also, a RELEASE command is terminated with a GOOD status, but the release
operation specified in a RELEASE command issued to the IDD by a SCSI device which does not have
the Reserve Right is disregarded.