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C141-E124-01EN4 - 36
false device failure is reported with an additional sense code of FAILURE PREDICTION
THRESHOLD EXCEEDED [=50-FF]. If both the Test and the DExcpt bits are one, the device
server terminate the MODE SELECT command with CHECK CONDITION status. The sense key
is set to ILLEGAL REQUEST [=5] with the additional sense code set to INVALID FIELD IN
PARAMETER LIST [=26-05]. A Test bit of zero instructs the device server not to generate any
false device faulure notifications.
A disable exception control (DExcpt) bit of zero indicates information exception operations is
enabled. The reporting of information exception conditions when the "DExcpt" bit is set to zero is
determined from the method of reporting informational exceptions field. A "DExcpt" bit of one
indicates the target disables all information exception operations. The method of reporting
informational exceptions field is ignored when "DExcpt" is set to one.
An enable warning (EWASC) bit of zero indicates the target disables reporting of the warning.
The "MRIE" field is ignored when "DExcpt" is set to one and "EWASC" is set to zero. An
"EWASC" bit of one indicates warning reporting is enabled. The method for reporting the
warning when the "EWASC" bit is set to one is determined from the "MRIE" field.
If background functions are supported, an Enable Background Function (EBF) bit of one indicates
the target enables background functions. An "EBF" bit of zero indicates the target disables the
functions.
A Performance
(Perf)
bit of zero indicates that informational exception operations that are the
cause of delays are acceptable. A Perf bit of one indicates the target is not cause delays while
doing informational exception operations. A Perf bit set to one may cause the target to disable
some or all of the informational exceptions operations, thereby limiting the reporting of
informational exception conditions.
The Method of Reporting Informational Exceptions
(MRIE)
field indicates the methods that is
used by the target to report informational exception conditions. The priority of reporting multiple
informational exceptions is vendor specific.