SCSI Description
5–56 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
LOG SENSE Command (4Dh) (continued)
5.13.2 LOG SENSE Log Pages
The log pages that are returned from the drive have a common format that is shown
in Figure 5−22. Each page contains a 4-byte header followed by one or more log
parameters. Refer to Table 5−23.
Bit
Byte
7 6 5 4 3 2 1 0
0 Reserved Page Code
1 Reserved
2 – 3 Page Length (n-3)
4 to
x+3
Log Parameter (first)
(length x)
1
• •
• •
• •
• •
n-y+1
to n
Log Parameter (last)
(length y)
1
NOTE:
1
Length x or y is the sum of parameter header and parameter data value bytes.
Figure 5−22 LOG SENSE Log Page Format − Data Format
Table 5−23 LOG SENSE Log Page Format − Field Descriptions
Field Description
Page Code The page code as given in Table 5−20.
Page Length The allocation length for the page minus the 4-byte header.
Log Parameter One or more log data entities that are returned as par of a Log Page. Each
Log Parameter starts with a 4-byte header followed by one or more bytes
of value data. In most cases, the parameter value is a 4-byte longword
that contains the present value of an error or performance counter. See
Figure 5−23 for the format of a generic log parameter.
