SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001Table B.3 — SBC write-once commands that are allowed in the presence of various reservationsCommandAddressedLU isreservedby anotherinitiator[A]Addressed LU has this type of persistent reservationheld by another initiator[B]From any initiatorWriteExclExclAccessFromregisteredinitiator(RO alltypes)From initiator notregisteredWrite Excl– ROExcl Access– ROLOCK/UNLOCK CACHE Conflict Conflict Conflict Allowed Conflict ConflictMEDIUM SCAN Conflict Allowed Conflict Allowed Allowed ConflictPRE-FETCH Conflict Allowed Conflict Allowed Allowed ConflictREAD(6)/READ(10)/READ(12) Conflict Allowed Conflict Allowed Allowed ConflictREAD CAPACITY Allowed Allowed Allowed Allowed Allowed AllowedREAD LONG Conflict Conflict Conflict Allowed Conflict ConflictREASSIGN BLOCKS Conflict Conflict Conflict Allowed Conflict ConflictSEEK(10) Conflict Conflict Conflict Allowed Conflict ConflictSET LIMITS(10)/SET LIMITS(12) Allowed Allowed Allowed Allowed Allowed AllowedSTART/STOP UNITSTART=1 and POWER CONDITION=0Allowed Allowed Allowed Allowed Allowed AllowedSTART/STOP UNITSTART=0 or POWER CONDITION0Conflict Conflict Conflict Allowed Conflict ConflictSYNCHRONIZE CACHE Conflict Conflict Conflict Allowed Conflict ConflictVERIFY(10)/VERIFY(12) Conflict Allowed Conflict Allowed Allowed ConflictWRITE(6)/WRITE(10)/WRITE(12) Conflict Conflict Conflict Allowed Conflict ConflictWRITE AND VERIFY(10)/WRITE AND VERIFY(12)Conflict Conflict Conflict Allowed Conflict ConflictWRITE LONG Conflict Conflict Conflict Allowed Conflict ConflictKey: LU=Logical Unit, Excl=Exclusive, RO=Registrants Only, Not Equal232 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 20B.2 SMC commandsThis subclause should be placed into the model clause of the next version of the SMC standard when, and if, a newversion of that standard is published. It should replace all the individual command descriptions of how reservationswork.Reservation restrictions are placed on commands as a result of access qualifiers associated with the type of reservation.The details of which commands are allowed under what types of reservations are described in table B.4.For the reservation restrictions placed on commands for the reserve/release management method see table B.4column [A]. For the reservation restrictions placed on commands for the persistent reservations managementmethod, see the columns under [B] in table B.4.In table B.4 the following key words are used:allowed: Commands issued by initiators not holding the reservation or by initiators not registered when a registrantsonly persistent reservation is present should complete normally.conflict: Commands issued by initiators not holding the reservation or by initiators not registered when a registrantsonly persistent reservation is present shall not be performed and the device server shall terminate thecommand with a RESERVATION CONFLICT status.Commands from initiators holding a reservation should complete normally. The behavior of commands from registeredinitiators when a registrants only persistent reservation is present is specified in table B.4.A command that does not explicitly write the medium shall be checked for reservation conflicts before thecommand enters the current task state for the first time. Once the command has entered the current task state, itshall not be terminated with a RESERVATION CONFLICT due to a subsequent reservation.A command that explicitly writes the medium shall be checked for reservation conflicts before the device servermodifies the medium or cache as a result of the command. Once the command has modified the medium, it shallnot be terminated with a RESERVATION CONFLICT due to a subsequent reservation.For each command, this standard, SPC-2, or a related command standard defines the conditions that result inRESERVATION CONFLICT. Depending on the particular command standard the conditions are defined in thatstandard’s device model clause or in the subclauses that define the specific commands. An annex in SPC-2contains the RESERVATION CONFLICT information for some of the command sets.dpANS SCSI Primary Commands - 2 (SPC-2) 233
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