Maxtor 10K III manual 0COG

SCSI Description

		A PERSISTENT RESERVATION OUT command with Release service action re-
		moves 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 PE SISTENT RESERVATION OUT com-
		mand that specifies a Release service action when no persistent reservation ex-
		ists from that initiator does not result in an error. Instead, the device server
		returns a GOOD message without altering any other reservation: the reserva-
		tion 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 reser-
		vation 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 ILLE-
		GAL REQUEST and additional sense data is set to INVALID RELEASE OF AC-
02h	Release	TIVE PERSISTENT RESERVATION. Attempts to release persistent reservations
%QFG	0COG	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:
		1. Powering off. When the most recent APT L 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
		2. Executing a PERSISTENT RESERVATION OUT command from another initi-
		ator with a persistent reserve service&GUETKRVKQPaction 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.
		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.
03h	Clear	A UNIT ATTENTION condition is established for all initiators for the cleared log-
		ical 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 re-
		coveries associated with initiator or system reconfiguration, since data integrity
		may be compromised.

Maxtor Atlas 10K III 5-99