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.
Table 5.21 Log parameter format
Bit
Byte 7 6 5 4 3 2 1 0
0 Parameter code (MSB)
1 Parameter code (LSB)
2 DU DS TSD ETC TMC LBIN LP
3 Parameter length
4
Parameter value
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
SELECT command specifies a new parameter value for the log parameter.
"0": The HDD will update the values of log parameters to ensure that the log
parameters reflect all events.
c. DS (Disable Save)
"1": When the "SP" bit is "1," the log parameter value will not be saved by the
LOG SELECT or LOG SENSE command.
"0": When the "SP" bit is "1," the current parameter value will be saved by the
LOG SELECT or LOG SENSE command.
d. TSD (Target Save Disable)
C141-C013 327