SCSI Commands: 20BLOG SELECT
Page
47
Log Page
See Page
Tape Device Statistics Log Page (3Eh)
77
3.8.2.4
Log Parameter Maximum Counts
The maximum value of each counter depends on the size of the counter in bytes.
When the maximum count is reached, the DU bit in the Parameter Control byte for
the counter is set to one for the LOG SENSE data indicating that the parameter is no
longer to be updated by the drive because the maximum count has been reached
and if RLEC (Report Log Exception Condition) bit in Mode Page 0Ah (Control Mode
page) is set to one, Recovered Error/Log Counter at Maximum (01/5B/02) is
returned to host to inform of the log exception. Bytes 15-17 of the REQUEST
SENSE data specify the page, MSB and LSB of the Parameter Code respectively,
which caused the Log Exception.
When a counter reaches the maximum, the counter is no longer incremented. If a
maximum value for the parameter size is reached, the count does NOT roll over and
continue counting. When any counter of a page reaches maximum, all counters of
that page are no longer incremented. A LOG SELECT command can be issued for
pages 02h, 03h, and 32h with the PCR bit set to reset the accumulated values and
to allow counters to continue as normal. The DU bit of the affected parameter is also
reset to zero. A SCSI Bus Reset, Bus Device Reset, or cartridge loading can
achieve the same effect.
3.8.3
LOG SELECT Completion Status
Code Message
Description
00h Good
Status
•
The drive is ready to perform any appropriate command.
•
The affected log parameters are reset.
•
The tape position is not changed.
02h
Check
Condition
Use the REQUEST SENSE command to retrieve status information.
Possible Sense Keys are:
Code Message
Description
04h
Hardware Error
Parity error on the SCSI bus or drive
hardware failure.
05h
Illegal Request
The Reserved bits are set or the
Parameter List Length is not 0 in the
Command Descriptor Block.
06h
Unit Attention
The cartridge was changed, or the drive
was reset prior to this command.
Summary of Contents for LTO 4
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