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SCSI Commands: 20BLOG SELECT
Page
45
Field
Bytes
Bits
Description
Parameter
List
Length
7-8 Always 0. Specifies the length (in bytes) of the parameter list to be
transferred during the Data Out phase. A 0 length indicates that no
parameter data is to be transferred.
Reserved
All reserved bits must be 0.
Control 9
See
SCSI Command Control Byte Format on page 25.
Note:
Pages 00h, 0Ch, 0Dh, 12h, 14h, 16h, 30h, 31h, 33h and 3Eh 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.
3.8.2
Log Pages
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.
Byte
Bits
7 6 5 4 3 2 1 0
0
Reserved Page
Code
1
Reserved
2
(MSB)
3
Page Length
(LSB)
3.8.2.1
Log Page Field Descriptions
Field Bytes
Bits
Description
Page
Code
0
0-5
Identifies the page.
Page
Length
2-3 Indicates the length of log parameters (in bytes) that follow the page
header.
Reserved
All reserved bits must be 0.
3.8.2.2
Log Parameter
The following table shows a typical log parameter format.
Byte
Bits
7 6 5 4 3 2 1 0
0
(MSB)
1
Parameter Code
(LSB)
2
DU DS
Reserved
3
Parameter
Length
(n-3)
4
(MSB)
n
Parameter Value
(LSB)
Summary of Contents for LTO 4
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