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Byte 2 of the Log Parameter Block is referred to as the Parameter Control Byte; it is
made up of six control bits plus one bit that is reserved.
DU Disable Update. This field with a value 0 indicates that the target will update
all log parameter values. This field set to 1 indicates that the target will not
update the log parameter values except in response to LOG SELECT. This
bit is set by the drive when accumulated values reach maximum. This is also
returned set to 1 if the host set the bit in the last LOG SELECT command.
Default is 0.
Note that for parameter types other than threshold and cumulative values,
this bit is always 0.
DS Disable Save. Not supported; always set to 1.
TSD Target Save Disable. Not supported; always set to 1.
ETC Enable Threshold Comparison. When set to 1, indicates that comparison to
threshold is performed. ETC of 0 indicates that the comparison is not
performed. This bit is set to 1 by the Control Mode Page of MODE SELECT.
Default is 0.
TMC Threshold Met Criteria. This field is valid only if host sets ETC to 1. It
determines the basis for comparison and is specified by host using LOG
SELECT. If the result of comparison is true (cumulative = threshold), and
MODE SELECT / SENSE Control Mode Page RLEC bit is set to 1, then a
UNIT ATTENTION is granted for all initiators. The sense key is set to UNIT
ATTENTION, the additional sense code to LOG EXCEPTION, and ASCQ is
set to THRESHOLD CONDITION MET. If the RLEC bit in Control Mode Page
is 0, then UNIT ATTENTION is not generated.
Note that comparison is performed in real time. A Log Sense command need
not be issued to get the check condition. Once ETC is selected, RLEC bit in
Control Mode Page, the check condition is issued based on the criteria
defined in the TMC bits if the criteria is met in real time. Check condition will
not identify for which parameter code the criteria is met. Log Sense must be
issued to read the counters to determine for which parameter code criteria
has been met.
The criteria for comparison are:
00b Every update of the cumulative value
01b Cumulative value equal to threshold value
10b Cumulative value not equal to threshold value
11b Cumulative value greater than threshold value
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