5.2 Log Parameters

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

 

7

6

5

 

4

3

 

2

1

0

 

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

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Fujitsu MBC2073RC, MBC2036RC, MBA3300RC, MBA3147RC, MBA3073RC specifications Log Parameters, Log parameter format