SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001Alternatively, an initiator may establish a reservation key without regard for whether one has previously been establishedby issuing a PERSISTENT RESERVE OUT command with a service action of REGISTER AND IGNOREEXISTING KEY and the following parameters:a) APTPL bit optionally set to one; andb) service action reservation key set to a non-zero value.If a PERSISTENT RESERVE OUT with a REGISTER AND IGNORE EXISTING KEY service action is sent whenan established registration exists, that registration shall be superseded with the specified service action reservationkey. If a PERSISTENT RESERVE OUT with a REGISTER AND IGNORE EXISTING KEY service action is sentwhen there is no established registration, a new registration shall be established.If a PERSISTENT RESERVE OUT with a REGISTER or a REGISTER AND IGNORE EXISTING KEY serviceaction is attempted, but there are insufficient device server resources to complete the operation, the device servershall return a CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST and the additionalsense data shall be set to INSUFFICIENT REGISTRATION RESOURCES.In response to a PERSISTENT RESERVE OUT with a REGISTER or a REGISTER AND IGNORE EXISTING KEYservice action the device server shall perform a registration by doing the following as an uninterrupted series ofactions:a) Process the registration request regardless of any persistent reservations;b) process the APTPL bit;c) ignore the contents of the SCOPE and TYPE fields;d) map the reservation key to the registering initiator using the initiator identification and, if available, theinitiator port’s world wide identification;e) register the reservation key without changing any a persistent reservation that may exist; andf) retain the reservation key and associated information.After the registration request has been processed, the device server shall then allow other PERSISTENTRESERVE OUT commands from the registered initiator to execute. For each initiator that performs aPERSISTENT RESERVE OUT with a REGISTER or a REGISTER AND IGNORE EXISTING KEY service action,the device server shall retain the reservation key until the key is changed by a new PERSISTENT RESERVE OUTcommand with the REGISTER or the REGISTER AND IGNORE EXISTING KEY service action from the sameinitiator or until the initiator registration is removed (see 5.5.3.6).Any PERSISTENT RESERVE OUT command service action received from an unregistered initiator, other than theREGISTER or the REGISTER AND IGNORE EXISTING KEY service action, shall be rejected with a RESER-VATION CONFLICT status.It is not an error for an initiator that is registered to register again with the same reservation key or a new reservationkey. A registration shall have no effect on any other registrations (e.g., when more than one initiator is registeredwith the same reservation key and one of those initiators registers again it has no effect on the other initiator’sregistrations). A registration that contains a non-zero value in the service action reservation key field shall have noeffect on any reservations (i.e., an initiator may change its reservation key without affecting any previously createdreservation).Multiple initiators may register with the same reservation key. An initiator may use the same reservation key formultiple logical units.30 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 205.5.3.5 Creating a persistent reservation when there is no persistent reservationAn application client creates a persistent reservation by issuing a PERSISTENT RESERVE OUT command with aservice action of RESERVE through a registered initiator with 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 the reservation being created.Only one persistent reservation with a scope of logical unit is allowed at a time per logical unit. Multiple persistentreservations with a scope of element may be created in a logical unit that contains multiple elements. However,there shall only be one persistent reservation per element.If the target receives a PERSISTENT RESERVE OUT command that attempts to create a persistent reservationwhen a persistent reservation already exists for the logical unit from an initiator other than the initiator that createdthe reservation, then the command shall be rejected with a RESERVATION CONFLICT status.If the initiator that created the persistent reservation attempts to modify the TYPE or SCOPE of an existing reservation,then the command shall be rejected with a RESERVATION CONFLICT status.If the device server receives a PERSISTENT RESERVE OUT command with a service action of RESERVE wherethe TYPE and SCOPE are the same as the existing TYPE and SCOPE from the initiator that created the persistentreservation, it shall not make any change to the existing reservation and shall return a GOOD status.If the target receives a RESERVE(10) or RESERVE(6) command when a persistent reservation exists for thelogical unit then the command shall be rejected with a RESERVATION CONFLICT.See 5.5.1 for information on when a persistent reservation takes effect.5.5.3.6 Removing registrations and persistent reservations5.5.3.6.1 Overview of removing registrations and persistent reservationsA registered initiator using the value of the initiator/logical unit pair’s established reservation key may release orpreempt a persistent reservation by issuing one of the following commands:a) a PERSISTENT RESERVE OUT command with a service action of RELEASE from the initiator thatperformed the reservation (see 5.5.3.6.2);b) a PERSISTENT RESERVE OUT command with a PREEMPT service action specifying the reservation keyof the initiator holding the reservation (see 5.5.3.6.3);c) a PERSISTENT RESERVE OUT command with a PREEMPT AND ABORT service action specifying thereservation key of the initiator holding the reservation (see 5.5.3.6.4); ord) a PERSISTENT RESERVE OUT command with a service action of CLEAR service action (see 5.5.3.6.5).A registered initiator using the value of the initiator/logical unit pair’s established reservation key may remove aregistration by issuing one of the following commands:a) a PERSISTENT RESERVE OUT command with a PREEMPT service action specifying that reservationkey (see 5.5.3.6.3);b) a PERSISTENT RESERVE OUT command with a PREEMPT AND ABORT service action specifying thatreservation key (see 5.5.3.6.4);c) a PERSISTENT RESERVE OUT command with a CLEAR service action (see 5.5.3.6.5); ord) a PERSISTENT RESERVE OUT command with a REGISTER or a REGISTER AND IGNORE EXISTINGKEY service action from the same initiator with the value of the service action reservation key field set tozero.dpANS SCSI Primary Commands - 2 (SPC-2) 31
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