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Command Specifications
4.1.16 LOG SENSE (4D)
Bit
Byte
7 6 5 4 3 2 1 0
0 X'4D'
1
0 0 0 0 0
0 PPC SP
2 PC Page Code
3
0 0 0 0 0 0 0
0
4
0 0 0 0 0 0 0
0
5 Parameter Pointer (MSB)
6 Parameter Pointer (LSB)
7 Parameter List Length (MSB)
8 Parameter List Length (LSB)
9 0 0
0 0 0
0
0
0
This command provides a means for the application client to retrieve statistical or
other operational information maintained by the device about the device or its
logical units.
It is a complementary command to the LOG SELECT command.
The "Parameter Pointer Control (PPC)" bit is not supported. It should be zero.
An "Save Parameters (SP)" bit of zero indicates the device server performs the
specified this command and does not save any log parameters. If saving log
parameters is implemented, an "SP" bit of one indicates that the device server
performs the specified this command and saves all log parameters identified as
savable by the "DS" bit to the disc medium.
The "Page Control (PC)" field defined the type of parameter values to be selected
(see 4.1.15 for the definition of the page control field).
The "PC" bits are ignored by the drive. The drive assumes that current cumulative
parameters are selected.
The "Page Code" field identifies which page of data is being requested. If the page
code is reserved or not implemented, the device server terminates the command
with CHECK CONDITION status (ILLEGAL REQUEST [=5] / Invalid field in
CDB [=24-00]).
The "Page Code" assignments for the log pages are listed in Table 4.23.
192 C141-C013