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4.1 Control/Sense Commands
[= 5], and the sense data is set to INSUFFICIENT REGISTRATION [= 55-04].
(However, this sense data is not reported for a SCSI device.)
For RESERVE, PREEMPT, and PREEMPT and ABORT Service Actions of this
command, it is determined whether a reserve condition to be newly set by this
command conflicts with the reserve conditions already held in the drive, regarding
the setting of the Scope and Type. When any conflicting reserve condition exists,
this command is rejected with the RESERVATION CONFLICT status, and no
RESERVE, PREEMPT, or CLEAR processing is performed. However, the
reserve conditions held by the INIT to be preempted by PREEMPT or PREEMPT
and ABORT Service Action (the INIT specified in the "Service Action
Reservation Key" field) are not subject to the judgment on whether a conflict
exists.
The RELEASE and CLEAR Service Actions of this command do not conflict
with any reserve conditions (however, the RESERVATION CONFLICT is
reported if a Reservation key has not been registered or it is different from the
registered one).
If an INIT that has not registered a Reservation key issues this command with the
specification of a Service Action except REGISTER, or REGISTER and IGNORE
EXISTING KEY Service Action, this command is rejected with a report
indicating a RESERVATION CONFLICT status.
The PERSISTENT RESERVE OUT command contains the fields for specifying
different restrictions imposed according to the Service Action type of
PERSISTENT RESERVATION, the Scope to which PERSISTENT
RESERVATION is applied, and PERSISTENT RESERVATION. For the
definitions of the "Type" and "Scope" fields, refer to the PERSISTENT
RESERVE IN command. If a Scope value that is not executed by the device is
specified in the "Scope" field, the drive reports the CHECK CONDITION status.
The sense key is set to ILLEGAL REQUEST [= 5], and the sense data is set to
INVALID FIELD IN CDB [= 24-00].
In each field in the PERSISTENT RESERVE OUT parameter list, the Reservation
key required to execute this PERSISTENT RESERVATION Service Action and
the information regarding the Reservation key are specified.
The parameter list is a 24-byte long list, and the Parameter Length field should
contain "24 (18h)." If the Parameter Length field contains a value other than "24
(18h)," the drive reports the CHECK CONDITION status. The sense key is set to
ILLEGAL REQUEST [= 5], and the sense data is set to PARAMETER LIST
LENGTH ERROR [= 1A-00].
A logical unit uses the SA space to maintain PERSISTENT RESERVATION and
registered keys (across a power shutdown). If the drive is not in the Ready state
when the Activate Persist Through Power Loss mechanism (this mechanism
maintains reserve conditions during a power shutdown) is enabled by the
PERSISTENT RESERVE OUT command, the drive reports the CHECK
CONDITION status. The sense key is set to NOT READY [= 2], and the sense
data is set according to the same definition that is used to report to the TEST
UNIT READY command.
C141-C009
4-127
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