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SCSI Commands
Log Pages
Field Descriptions
Log Parameter
Field Descriptions
Field
Bytes
Bits
Control
9
Note:
Pages 00h, 0Ch, 30h, and 31h cannot be reset by Log Select.
The drive does not maintain a separate set of log parameters for each initiator.
Therefore, a Log Select command affects all initiators.
Note:
The subsequent section discusses the Log Sense command. The log page
codes and the log parameter codes are described in that section.
A log page is made up of a four-byte page header and one or more log parameters.
A log parameter is made up of a four-byte parameter header and one or more
associated parameter data bytes.
The following table shows the log page header format.
Bits
Byte
7
6
0
Reserved
1
2
3
Field
Bytes
Bits
Page
0
0-5
Code
Page
2-3
Length
Reserved
The following table shows a typical log parameter format.
Bits
Byte
7
6
0
1
2
DU
DS
3
4
n
Field
Bytes
Bits
Parameter
0-1
Code
Description
See Control Byte Format on page 18.
5
4
3
Page Code
Reserved
Page Length, MSB
Page Length, LSB
Description
Identifies the page.
Indicates the length of log parameters (in bytes) which follow the
page header.
All reserved bits must be 0.
5
4
3
Parameter Code, MSB
Parameter Code, LSB
Reserved
Parameter Length (n-3)
Parameter Value
Parameter Value
Description
Identifies the log parameter. Log Parameters are always in ascend-
ing order.
Page 39
2
1
0
2
1
0
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