SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 20018.3.6 Control mode pageThe control mode page (see table 154) provides controls over several SCSI features that are applicable to alldevice types such as tagged queuing, asynchronous event reporting, and error logging.Table 154 — Control mode pageBitByte7 6 5 4 3 2 1 00 PS Reserved PAGE CODE (0Ah)1 PAGE LENGTH (0Ah)2 TST Reserved GLTSD RLEC3 QUEUE ALGORITHM MODIFIER Reserved QERR DQUE4 TAS RAC Reserved SWP RAERP UAAERP EAERP5 Reserved AUTOLOAD MODE6 (MSB)READY AER HOLDOFF PERIOD7 (LSB)8 (MSB)BUSY TIMEOUT PERIOD9 (LSB)10 (MSB)EXTENDED SELF-TEST COMPLETION TIME11 (LSB)A task set type field (TST) specifies the type of task set (see table 155). If the device maintains mode pages perinitiator, the TST field, if changeable, shall reflect in all initiator pages the state selected by the most recent MODESELECT. If the most recent MODE SELECT changes the setting of this field the device server shall establish a unitattention condition for all initiators except the one that issued the MODE SELECT command (see SAM-2). Thedevice server shall set the additional sense code to MODE PARAMETERS CHANGED.Table 155 — Task set typeValue000b001b010b - 111bDescriptionTask set per logical unit for all initiatorsTask set per initiator per logical unitReservedA global logging target save disable (GLTSD) bit of zero allows the target to provide a target-defined method forsaving log parameters. A GLTSD bit of one indicates that either the target has disabled the target-defined methodfor saving log parameters or when set by the initiator specifies that the target-defined method shall be disabled.A report log exception condition (RLEC) bit of one specifies that the device server shall report log exception conditionsas described in 8.2. A RLEC bit of zero specifies that the device server shall not report log exception conditions.196 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 20The QUEUE ALGORITHM MODIFIER field (see table 156) specifies restrictions on the algorithm used for reorderingtasks having the SIMPLE task attribute.Table 156 — Queue algorithm modifierValue0h1h2h - 7h8h - FhDescriptionRestricted reorderingUnrestricted reordering allowedReservedVendor specificA value of zero in the QUEUE ALGORITHM MODIFIER field specifies that the device server shall order the processingsequence of tasks having the SIMPLE task attribute such that data integrity is maintained for that initiator. Thismeans that, if the transmission of new service delivery requests is halted at any time, the final value of all dataobservable on the medium shall have exactly the same value as it would have if all the tasks had been given theORDERED task attribute. The restricted reordering value shall be the default value.A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the device server may reorder the processingsequence of tasks having the SIMPLE task attribute in any manner. Any data integrity exposures related to tasksequence order shall be explicitly handled by the application client through the selection of appropriate commandsand task attributes.The queue error management (QERR) field specifies how the device server shall handle blocked tasks whenanother task receives a CHECK CONDITION status (see table 157). The task set type (see the TST field definitionabove) defines which tasks are blocked. If TST field equals 000b, then all tasks from all initiators are blocked. If TSTfield equals 001b, then only tasks from the initiator that receives the CHECK CONDITION status are blocked.Table 157 — Queue error management (QERR) fieldValue00b01b10b11bDefinitionBlocked tasks in the task set shall resume after an ACA or CA condition is cleared (see SAM-2).All the blocked tasks in the task set shall be aborted when the CHECK CONDITION status issent. If the TAS bit is zero, a unit attention condition (see SAM-2) shall be generated for eachinitiator that had blocked tasks aborted except for the initiator to which the CHECK CONDITIONstatus was sent. The device server shall set the additional sense code to COMMANDSCLEARED BY ANOTHER INITIATOR. If the TAS bit is one, all tasks blocked for initiators otherthan the initiator for which the CHECK CONDITION status was sent shall be completed with aTASK ABORTED status and no unit attention shall be generated.ReservedBlocked tasks in the task set belonging to the initiator to which a CHECK CONDITION status issent shall be aborted when the status is sent.A disable queuing (DQUE) bit of zero specifies that tagged queuing shall be enabled if the device server supportstagged queuing. A DQUE bit of one specifies that tagged queuing shall be disabled. Any queued commandsreceived by the device server shall be aborted. The method used to abort queued commands is protocol specific.The report a check (RAC) bit provides control of reporting long busy conditions or CHECK CONDITION status. ARAC bit of one specifies that a CHECK CONDITION status should be reported rather than a long busy condition(e.g., longer than the BUSY TIMEOUT PERIOD). A RAC bit of zero specifies that long busy conditions (e.g., busycondition during auto contingent allegiance) may be reported.dpANS SCSI Primary Commands - 2 (SPC-2) 197
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