SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001Table 162 — Method of reporting informational exceptions (MRIE) field (part 2 of 2)MRIE4h5h6h7h - BhCh - FhDescriptionUnconditionally generate recovered error: This method instructs the device server to reportinformational exception conditions, regardless of the value of the per bit of the error recoverymode page, by returning a CHECK CONDITION status. If the TEST bit equals zero, the statusmay be returned on any command after the informational exception condition occurs. If the TESTbit equals one, the status shall be returned on the next command that is normally capable ofreturning an informational exception condition when the TEST bit equals zero. The sense keyshall be set to RECOVERED ERROR and the additional sense code shall indicate the cause ofthe informational exception condition.The command that has the CHECK CONDITION shall complete without error before any informationalexception condition may be reported.Generate no sense: This method instructs the device server to report informational exceptionconditions by returning a CHECK CONDITION status. If the TEST bit equals zero, the statusmay be returned on any command after the informational exception condition occurs. If the TESTbit equals one, the status shall be returned on the next command that is normally capable ofreturning an informational exception condition when the TEST bit equals zero. The sense keyshall be set to NO SENSE and the additional sense code shall indicate the cause of the informationalexception condition.The command that has the CHECK CONDITION shall complete without error before any informationalexception condition may be reported.Only report informational exception condition on request: This method instructs the deviceserver to preserve the informational exception(s) information. To find out about informationexception conditions the application client polls the device server by issuing an unsolicitedREQUEST SENSE command. The sense key shall be set to NO SENSE and the additionalsense code shall indicate the cause of the informational exception condition.ReservedVendor specificThe INTERVAL TIMER field indicates the period in 100 millisecond increments for reporting that a informationalexception condition has occurred. The device server shall not report informational exception conditions morefrequently than the time specified by the INTERVAL TIMER field and as soon as possible after the timer interval haselapsed. After the informational exception condition has been reported the interval timer shall be restarted. Avalue of zero or FFFFFFFFh in the INTERVAL TIMER field shall indicate the timer interval is vendor specific.The REPORT COUNT field indicates the number of times to report an informational exception condition to the applicationclient. A value of zero in the REPORT COUNT field indicates there is no limit on the number of times the deviceserver reports an informational exception condition.The maintaining of the INTERVAL TIMER and the REPORT COUNT fields across power cycles and/or resets by thetarget are vendor specific.8.3.9 Power condition pageThe power condition page (see table 163) provides the application client the means to control the behavior of alogical unit in a manner that reduces the power required to operate. There shall be no notification to the initiatorthat a logical unit has entered into one of the power conditions. The application client may determine if a powercondition is in effect by issuing a REQUEST SENSE command (see 7.20). In addition to the power condition page,the power conditions may be controlled by the START STOP UNIT command (see SBC). If both methods are being204 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 20used on the same logical unit then any START STOP UNIT commands power condition request shall override thepower condition pages power control.No power condition shall affect the supply of any power required for proper operation of the service deliverysubsystem.On the receipt of a command the device server shall adjust itself to the power condition that allows the command toexecute. The timer that maps to this power condition and any lower power condition timers shall be reset on receiptof the command. On completion of the command the timer associated with this power condition shall be restarted.Logical units that contain cache memory shall implicitly perform a SYNCHRONIZE CACHE command (see SBC)for the entire medium prior to entering into any power condition that prevents access the media (e.g., the spindlebeing stopped).The logical unit shall use the power condition page to control the power conditions after a power on or a hard resetuntil a START STOP UNIT command is received that sets power conditions.Table 163 — Power condition pageBitByte7 6 5 4 3 2 1 00 PS Reserved PAGE CODE (1Ah)1 PAGE LENGTH (0Ah)2 Reserved3 Reserved IDLE STANDBY4 (MSB)IDLE CONDITION TIMER7 (LSB)8 (MSB)STANDBY CONDITION TIMER11 (LSB)An IDLE bit of one indicates that the logical unit shall use the IDLE CONDITION TIMER field to determine the length ofinactivity time to wait before entering the idle condition. An IDLE bit of zero indicates that the logical unit shall notenter the idle condition.A STANDBY bit of one indicates that the logical unit shall use the STANDBY CONDITION TIMER field to determine thelength of inactivity time to wait before entering the standby condition. A STANDBY bit of zero indicates that thelogical unit shall not enter the standby condition.The IDLE CONDITION TIMER field indicates the inactivity time in 100 millisecond increments that the logical unit shallwait before entering the idle condition.If the IDLE bit is one, a value of zero in the idle condition timer indicates the logical unit shall enter the idle conditionon completion of any command.The STANDBY CONDITION TIMER field indicates the inactivity time in 100 millisecond increments that the logical unitshall wait before entering the standby condition. This timer shall only count if the idle condition timer is equal tozero.If the STANDBY bit is one and the IDLE bit is zero, a value of zero in the standby condition timer indicates the logicalunit shall enter the standby condition on completion of any command.dpANS SCSI Primary Commands - 2 (SPC-2) 205
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