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02h Release A PERSISTENT RESERVATION OUT command with Release service action
removes a persistent reservation held by the same initiator.
The fields associated with a Release service action match fields of the active
persistent reservation. Sending of a PERSISTENT RESERVATION OUT
command that specifies a Release service action when no persistent reservation
exists from that initiator does not result in an error. Instead, the device server
returns a GOOD message without altering any other reservation: the reservation
key is not changed by the Release service action.
The device server returns a CHECK CONDITION status for any PERSISTENT
RESERVATION OUT command that specifies the release of a persistent
reservation held by the requesting initiator that matches some but not all of the
Scope, Type, Reservation Key, and extent values. The sense key is set to
ILLEGAL REQUEST and additional sense data is set to INVALID RELEASE OF
ACTIVE PERSISTENT RESERVATION. Attempts to release persistent
reservations in which none of the Scope, Type, Reservation Key, and extent
values match an existing persistent reservation held by the initiator making the
request are not errors.
An active persistent reservation may also be released by:
• Powering off. When the most recent APTPL value received by the device
server is 0, a power-off performs a hard reset, clears all persistent
reservations, and removes all registered reservation keys;
or
• Executing a PERSISTENT RESERVATION OUT command from another
initiator with a persistent reserve service action of Pre-empt or Pre-empt and
Clear.
Note that a Release service action should not be performed if any operations
interlocked by the persistent reservation have not yet completed.
03h Clear A PERSISTENT RESERVATION OUT command with a successful Clear service
action removes all persistent reservations for all initiators. All reservation keys are
also removed. Any commands from any initiator that have been accepted by the
device server as non-conflicting continue their normal executions.
A UNIT ATTENTION condition is established for all initiators for the cleared logical
unit. The sense key is set to UNIT ATTENTION; the additional sense data is set to
RESERVATIONS PREEMPTED.
Note that applications should not use the Clear action service except during
recoveries associated with initiator or system reconfiguration, since data integrity
may be compromised.
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