SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001When a reservation key has been removed, no information shall be reported for that unregistered initiator in subsequentREAD KEYS service action(s) until the initiator is registered again (see 5.5.3.4). Any persistent reservationassociated with that unregistered initiator shall be released. If that released persistent reservation was of the typeWrite Exclusive – Registrants Only or Exclusive Access – Registrants Only the device server shall establish a unitattention condition for all registered initiators other than the initiator that issued the PERSISTENT RESERVE OUTcommand with PREEMPT or PREEMPT AND ABORT service action. The sense key shall be set to UNITATTENTION and the additional sense data shall be set to RESERVATIONS RELEASED.A persistent reservation may also be released by a loss of power, if the persist through power loss capability is notenabled. When the most recent APTPL value received by the device server is zero (see 7.11.3), a power cycle:a) performs a hard reset;b) releases all persistent reservations; andc) removes all registered reservation keys (see 5.5.3.4).5.5.3.6.2 Releasing a persistent reservationOnly the initiator that creates the persistent reservation is allowed to release that persistent reservation.An application client releases a persistent reservation it holds by issuing a PERSISTENT RESERVE OUTcommand with a service action of RELEASE through the registered initiator that holds the persistent reservationwith the following parameters:a) RESERVATION KEY set to the value of the initiator/logical unit pair’s established reservation key; andb) TYPE and SCOPE set to match the persistent reservation being released.In response to a persistent reservation release request from an initiator that created the persistent reservation thedevice server shall perform a release by doing the following as an uninterrupted series of actions:a) Releasing the persistent reservation;b) Not removing any registration(s);c) If the released persistent reservation has a type of Write Exclusive – Registrants Only or Exclusive Access– Registrants Only the device server shall establish a unit attention condition for all registered initiatorsother than the initiator that issued the PERSISTENT RESERVE OUT command with RELEASE serviceaction. The sense key shall be set to UNIT ATTENTION and the additional sense data shall be set toRESERVATIONS RELEASED; andd) If the persistent reservation is of any other type the device server shall not establish a unit attentioncondition.The established reservation shall not be altered and the device server shall return a CHECK CONDITION statusfor a PERSISTENT RESERVE OUT command that specifies the release of a persistent reservation held by therequesting initiator if the SCOPE and TYPE fields do not match the scope and type of the established persistentreservation. The sense key shall be set to ILLEGAL REQUEST and additional sense data shall be set to INVALIDRELEASE OF PERSISTENT RESERVATION.If there is no persistent reservation or in response to a persistent reservation release request from a registeredinitiator using the value of the initiator/logical unit pair’s established reservation key that does not hold thepersistent reservation, the device server shall do the following:a) Not release the persistent reservation (if any);b) Not remove or change any registration(s); andc) Return a status of GOOD.32 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 205.5.3.6.3 Preempting an existing persistent reservation with the PREEMPT service action5.5.3.6.3.1 Overview of preempting an existing persistent reservation with the PREEMPT service actionA PERSISTENT RESERVE OUT command with a PREEMPT service action is used to preempt a persistent reservationand/or registration. The determination of whether the preempt relates to a persistent reservation or a registrationis made by the device server by examining the value in the SERVICE ACTION RESERVATION KEY field of thePREEMPT service action. If the value in the SERVICE ACTION RESERVATION KEY field is associated with the reservationbeing preempted then the reservation is preempted and any matching registration(s) removed (see5.5.3.6.3.3).If the value in the SERVICE ACTION RESERVATION KEY field is not associated with the reservation, the reservation shallnot be preempted but any matching registration(s) shall be removed (see 5.5.3.6.3.4).dpANS SCSI Primary Commands - 2 (SPC-2) 33
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