SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001IGNORE EXISTING KEY, or CLEAR or if the scope is a LU_SCOPE reservation, the SCOPE-SPECIFIC ADDRESS fieldshall be set to zero.The Activate Persist Through Power Loss (APTPL) bit shall be valid only for the REGISTER, or the REGISTER ANDIGNORE EXISTING KEY service action. In all other cases, the APTPL bit shall be ignored. Support for an APTPL bitequal to one is optional. If a device server that does not support the APTPL bit value of one receives that value in aREGISTER or a REGISTER AND IGNORE EXISTING KEY service action, the device server shall return a CHECKCONDITION status. The sense key shall be set to ILLEGAL REQUEST and additional sense code shall be set toINVALID FIELD IN PARAMETER LIST.If the last valid APTPL bit value received by the device server is zero, the loss of power in the target shall release thepersistent reservation for all logical units and remove all reservation keys (see 5.5.3.4). If the last valid APTPL bitvalue received by the device server is one, the logical unit shall retain any persistent reservation(s) that may bepresent and all reservation keys for all initiators even if power is lost and later returned (see 5.5.3.2).Table 76 summarizes which fields are set by the application client and interpreted by the device server for eachservice action and scope value. The APTPL bit in the PERSISTENT RESERVE OUT parameter list, specified in theprevious paragraph, is not summarized in table 76.Table 76 — PERSISTENT RESERVE OUT service actions and valid parametersParametersSERVICE ACTIONService actionAllowed SCOPETYPERESERVATIONKEYRESERVATIONKEYSCOPE-SPECIFICADDRESSREGISTER ignored ignored valid valid ignoredREGISTERAND IGNOREEXISTING KEYignored ignored ignored valid ignoredRESERVERELEASELU_SCOPEELEMENT_SCOPELU_SCOPEELEMENT_SCOPEvalidvalidvalidvalidvalidvalidignoredignoredignoredignoredignoredvalid (element)ignoredvalid (element)CLEAR ignored ignored valid ignored ignoredPREEMPTPREEMPT &ABORTLU_SCOPEELEMENT_SCOPELU_SCOPEELEMENT_SCOPEvalidvalidvalidvalidvalidvalidvalidvalidvalidvalidignoredvalid (element)ignoredvalid (element)112 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 207.12 PREVENT ALLOW MEDIUM REMOVAL commandThe PREVENT ALLOW MEDIUM REMOVAL command (see table 77) requests that the target enable or disablethe removal of the medium in the logical unit. The logical unit shall not allow medium removal if any initiatorcurrently has medium removal prevented.Table 77 — PREVENT ALLOW MEDIUM REMOVAL commandBitByte7 6 5 4 3 2 1 00 OPERATION CODE (1Eh)1 Reserved2 Reserved3 Reserved4 Reserved PREVENT5 CONTROLTable 78 defines the PREVENT field values and their meanings.Table 78 — PREVENT ALLOW MEDIUM REMOVAL PREVENT fieldPREVENT00b01b10b11bDescriptionMedium removal shall be allowed from both the data transportelement and the attached medium changer (if any).Medium removal shall be prohibited from the data transportelement but allowed from the attached medium changer (if any).Medium removal shall be allowed for the data transport elementbut prohibited for the attached medium changer.Medium removal shall be prohibited for both the data transportelement and the attached medium changer.PREVENT values 10b and 11b are valid only when the RMB bit and the MCHNGR bit are both equal to one in thestandard INQUIRY data.The prevention of medium removal shall begin when any application client issues a PREVENT ALLOW MEDIUMREMOVAL command with a PREVENT field of 01b or 11b (i.e., medium removal prevented). The prevention ofmedium removal for the logical unit shall terminate:a) after all initiators with application clients that previously prevented medium removal issue PREVENTALLOW MEDIUM REMOVAL commands with a PREVENT field of 00b or 10b, and the device server hassuccessfully performed a synchronize cache operation; orb) upon a hard reset condition.For an initiator that has executed a PERSISTENT RESERVE OUT command with a service action of RESERVE,REGISTER AND IGNORE EXISTING KEY, or REGISTER service action, the PREVENT field shall be set to zero aspart of the uninterrupted sequence of events performed by a PERSISTENT RESERVE OUT command with aservice action of PREEMPT AND ABORT using that initiator's registration value in the SERVICE ACTION RESER-VATION KEY field. This allows an initiator to override the prevention of medium removal function for an initiator that isno longer operating correctly.dpANS SCSI Primary Commands - 2 (SPC-2) 113
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