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SCSI Commands: 20BLOG SELECT
3.8.2.3
Log Parameters Field Descriptions
Field
Bytes
Bits
Parameter
0-1
Code
Disable
2
7
Update
(DU)
Disable
2
6
Save (DS)
Parameter
3
Length
Parameter
4 - n
Value
Reserved
The parameter header contains a two-byte parameter code to identify the
parameter, a Parameter Control byte, and a parameter length byte.
All of the bits in byte 2 of the Log Parameter are collectively referred to as the
Parameter Control byte. The Parameter Control byte specifies counter controls.
The Parameter Control byte specifies:
•
Whether or not a counter or a log page is enabled.
•
Whether or not a Check Condition is generated when a counter is
incremented, and if so, how the Check Condition is generated.
Each Log Parameter contains only one control byte. This control byte is shared
between the threshold and accumulated parameters. The LOG SENSE data reflects
the current setting of the control byte for the parameter.
There are several logs of different formats that allow you to retrieve different drive
parameters. The following logs are supported:
Supported Log Pages Log Page (00h)
Write Error Counters Log Page (02h)
Read Error Counters Log Page (03h)
Sequential Access Device Log Page (0Ch)
Temperature Log Page (0Dh)
TapeAlert Response Log Page (12h)
Device Statistics Log Page (14h)
Tape Diagnostic Data Log Page (16h)
Protocol Specific Port Log Page (18h) (SAS only)
TapeAlert Log Page (2Eh)
Tape Usage Log Page (30h)
Tape Capacity Log Page (31h)
Data Compression Log Page (32h)
Error Events Log Page (33h)
Description
Identifies the log parameter. Log Parameters are always in
ascending order.
0 = Enables update of accumulated value when the corresponding
event occurs.
1 = Disables update of all accumulated values within a log page
when the corresponding event occurs. The drive sets this bit to
indicate that the accumulated value of the parameter has
reached its maximum value so that the drive can no longer
increment any Parameter Values.
Always 1, indicating that the drive does not support Save Page in
LOG SENSE and LOG SELECT.
n – 3, indicating the length of the Parameter Value.
Actual data.
Always 0.
Log Page
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