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5.2 Log Parameters
This section describes the log page structure and log pages that can be used for all
SAS devices.
Pages that are specific to each device format are described in the command
standard that applies to the pertinent device format. The LOG SENSE command
reports the log page that is specified in the page code field of the command
descriptor block.
Table 5.21 shows the log parameter format on each parameter page.
Bit
Byte
0
1
2
DU
3
4
~
~
~
~
n
a.
Parameter code
This field indicates the type of log parameter that is transferred to the log page.
b.
DU (Disable Update)
"1": The HDD will not update the value of a log parameter unless the LOG
"0": The HDD will update the values of log parameters to ensure that the log
c.
DS (Disable Save)
"1": When the "SP" bit is "1," the log parameter value will not be saved by the
"0": When the "SP" bit is "1," the current parameter value will be saved by the
d.
TSD (Target Save Disable)
C141-C013
Table 5.21 Log parameter format
7
6
5
Parameter code (MSB)
Parameter code (LSB)
DS
TSD
Parameter length
Parameter value
SELECT command specifies a new parameter value for the log parameter.
parameters reflect all events.
LOG SELECT or LOG SENSE command.
LOG SELECT or LOG SENSE command.
4
3
2
ETC
TMC
5.2 Log Parameters
1
0
LBIN
LP
327
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