3.1.19.1 Persistent Reserve Out Service Actions - Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications

The RESERVE, PREEMPT, and PREEMPT AND ABORT service actions of this command determine
whether any conflict of Scope or Type specifications occurs between two reservation requirements: the
new one provided by this command, and the other one already being held on the drive. If the reservation
requirements conflict, the command is rejected and returned with the RESERVATION CONFLICT
status. In this case, RESERVE, PREEMPT, and CLEAR processing is not executed. However, if the
reservation requirement held by an initiator is preempted (specified by the service action reservation key)
in the RESERVE, PREEMPT, or PREEMPT AND ABORT service action, the reservation requirement is
excluded from the conflict determination.
The RELEASE and CLEAR service actions do not conflict with any reservation requirements.
(However, if a reservation key is not registered, or if a reservation key does not match the reserved one,
it returns the RESERVATION CONFLICT status.)
If an initiator that does not register a reservation key issues this command specified with a service action
other than REGISTER or REGISTER AND IGNORE EXISTING KEY, the command is rejected and
returned with the RESERVATION CONFLICT status.
The PERSISTENT RESERVE OUT command includes fields for specifying the type of PERSISTENT
RESERVATION service action, the applied Scope of a persistent reservation, and the restrictions defined
by a persistent reservation. For definitions of "Type" and "Scope" fields, see Sections 3.1.18.3.1 and
3.1.18.3.2. If the specified Scope value cannot be executed on the device, the drive returns the "CHECK
CONDITION" status. The sense key is set to ILLEGAL REQUEST [=5], and sense data is set to
INVALID FIELD IN CDB [=24-00].
In fields on the PERSISTENT RESERVE OUT parameter list, information about the reservation key and
elements that are required for executing the PERSISTENT RESERVATION service action is specified.
The parameter list is 24 bytes in length so the "Parameter List Length" field must contain "24 (18h)." If
the parameter list length is not "24 (18h)," the drive returns the CHECK CONDITION status. Moreover,
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 nonvolatile memory to maintain persistent reservations and the registered keys (even
after unit power is turned off). (The AL-7 series product uses the SA space.) If the nonvolatile memory
is in the access-disabled state when the Active Persist Through Power Loss facility is enabled (to
maintain reservation requirements after unit power is turned off) by issuing the PERSISTENT
RESERVE OUT command, the drive returns the CHECK CONDITION status. The sense key is set to
NOT READY [=2], and sense data is set as defined in the TEST UNIT READY command.

3.1.19.1 PERSISTENT RESERVE OUT service actions

To execute a service action of the PERSISTENT RESERVE OUT, the drive updates the "Generation"
value as described in the Section 3.1.18.
Table 3.3 describes the service actions of the PERSISTENT RESERVE OUT command.
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3.1 Control/Sense Commands
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