Tandberg Data
Log Select
12-4
Tandberg SLR Product Line SCSI Functional Specifications
DU
When Disable Update (DU) bit is set to 1, it indicates
that the drive shall not update the associated parameter
value except in response to a LOG SELECT command.
When the DU bit is set to 0, it indicates that the drive
shall update the associated parameter to reflect all
events that should be noted by that parameter.
The DU bit can be set to 1 only when the corresponding
parameter is listed as modifiable and when PC field is
set 01b. Otherwise the command is terminated with CHECK
CONDITION status.
The default value is 0b.
DS, TDS
These bits must be set to values specified for each
parameter in the LOG SENSE section.
ETC
1
An Enable Threshold Comparison (ETC) bit of 1 indicates
that a comparison to the threshold value is to be
performed whenever the cumulative value is updated by
drive’s internal event.
A ETC bit of 0 that a comparison is not to be performed.
The value of the ETC bit is the same for cumulative and
threshold parameters.
The default value is 0b.
TMC
The TMC defines the basis for comparison of the
cumulative and threshold values. The Threshold Met
Criteria (TMC) field is valid only if ETC bit is 1. The
following values are legal:
00b
:
Every update of the cumulative value by drive’s
internal event gives a TRUE comparison.
01b
:
Only the updates by which the cumulative value
reach or pass through the threshold value gives a
TRUE comparison.
10b
:
Only the updates of the cumulative value to a
value different than the threshold gives a TRUE
comparison.
11b
:
Only the updates of the cumulative value to a
value greater than the threshold gives a TRUE
comparison.
If the result of comparison is TRUE and RLEC bit in MODE
SELECT Control Mode page (0Ah) is set to 1, a Unit
Attention condition will be generated for all
initiators. The Drive reports CHECK CONDITION status and
the Error Code will be T
HRESHOLD
C
ONDITION
M
ET
.
The value of the TMC field is the same for cumulative
and threshold parameters. The default value is 11b.
LBIN, LP
These bits must be set to values specified for each
parameter in the LOG SENSE section.
1
See the parameter description in the LOG SENSE command section to
ensure that threshold comparison is supported for the parameter in
question.
