OEM MANUAL:K6602771
6 COMMAND DESCRIPTIONS
Revision: 2 / Date: 2002.12.19
Page: 135 / 313
-- LOG SENSE usage -- :
A zero value of DU bit of a cumulative log parameter means the updating of that
parameter is enabled. The drive will increment the cumulative log parameter
value whenever an event should be noted by that parameter. A one value of DU
bit for a cumulative log parameter means the updating of that parameter is
disabled.
The value of DU bit is a “don’t care” for the threshold values and list
parameters.
Bit 6 : DS (Disable Save) bit
The DS bit in conjunction with the SP bit in the CDB is utilized to define if the
drive should save the specified log parameter cumulative or threshold value to
the disk after it performs a LOG SELECT or LOG SENSE command. Table
6-17 shows all the conditions.
The value of DS bit is a "don't care" for the list parameter because the save
function of list parameter is not supported.
Bit 5 : TSD (Target Save Disable) bit
A TSD bit indicates the capability of the drive-defined log parameters saving.
If TSD bit is enabled, the drive will automatically save the cumulative
parameter values every hour to insure they retain statistical significance (i.e.,
across power cycles).
The TSD bit of a list parameter is “don’t care”. The controller will
automatically save all the list parameters onto the drive every hour if any of the
TSD bits of data counters of any other pages (01
H
-06
H
) is set to zero.
-- LOG SELECT usage -- :
A zero value of TSD bit indicates the initiator requests the drive to turn on the
drive-defined saving operation. A one value of TSD bit is used by the initiator
to disable the saving operation.
If the initiator sets both the DS and the TSD bits to one, the drive will terminate
the LOG SELECT command with CHECK CONDITION status. The sense key
will be set to ILLEGAL REQUEST with the additional sense code set to
INVALID FIELD IN PARAMETER LIST.
-- LOG SENSE usage -- :
A zero value of TSD bit means the drive-defined saving operation is supported
and enabled. On the other hand, one means it is disabled.
LOG SELECT:(4Ch)