SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001A.5 Exception conditions during loggingThe logging operations may be setup to keep track of many different vendor specific items. This subclausedescribes how a device server informs an application client when a log reaches a critical point, thereby creating anexception condition.Table A.7 and table A.8 list the definitions of the parameter control byte of the log parameter. Table A.7 listsparameter control byte values that affect parameter saving. Table A.8 lists parameter control byte values that affectparameter updating and reporting.Table A.7 — Log Parameter Control Byte saving definitionsParameterControl ByteValuesControlMode Page(0Ah)DSbitTSDbitGLTSDbitDescription0 - - Indicates that the device server supports saving of the log parameter.1 - - Indicates that the device server does not support saving of the log parameterin response to a LOG SELECT or LOG SENSE command.- 0 0 Indicates that the device server provides a target-defined method of saving logparameters.- 1 0 Indicates that either the device server does not provide a target-definedmethod for saving log parameters or the target-defined method has beendisabled by an application client.- x 1 Indicates that either the device server does not provide a target-definedmethod for saving log parameters or the target-defined method has beendisabled by an application client.226 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 20Parameter Control Byte ValuesDUbitETCbitTMCfieldTable A.8 — Log Parameter Control Byte updating definitionsLPbitLBINbitDescription0 - -- - - Indicates that the device server updates the log parameter value toreflect all events that should be noted by that log parameter.1 - -- - - Indicates that the device server does not update the log parametervalue except in response to a LOG SELECT command thatspecifies a new value the log parameter.- 0 -- - - Indicates that a comparison between the threshold value and thecumulative value is not performed.- 1 -- - - Indicates that a comparison to the threshold value is performedwhenever the cumulative value is updated.- - 00 - - Indicates that device server informs the application client on everyupdate to the cumulative value.- - 01 - - Indicates that device server informs the application client on everytime the cumulative value is equal to the threshold value.- - 10 - - Indicates that device server informs the application client on everytime the cumulative value is not equal to the threshold value.- - 11 - - Indicates that device server informs the application client on everytime the cumulative value is greater than the threshold value.- - -- 0 x Indicates that the log parameter is a data counter.- - -- 1 0 Indicates that the log parameter is a list parameter and the listparameter is formatted as ASCII graphic codes.- - -- 1 1 Indicates that the log parameter is a list parameter and the listparameter is formatted in binary.Table A.9 describes the device server actions associated with logging exception conditions.Table A.9 — Logging exception conditionsLog Page ParameterControl Byte ValuesControlMode Page(0Ah)Device Server ActionDUbitETCbitTMCfieldLPbitRECLbitException condition actionsx x xx x 0 Logging activities do not cause an ACA condition or a UnitAttention condition.x 0 GT 0 1 x This is an illegal conditionx 1 xx 1 x This is an illegal condition0 1 xx 0 1 Follow pseudocode 1 (see A.5.1)0 0 NV 0 1 Follow pseudocode 2 (see A.5.2)0 0 00 1 1 Follow pseudocode 3 (see A.5.3)dpANS SCSI Primary Commands - 2 (SPC-2) 227
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