Chapter 4 SCSI Commands
LOG SENSE Command (4Dh)
DLT-S4 Interface Reference Guide
71
Table 42 Log Parameters for
Read / Write Error
LOG SENSE
Page— Field Descriptions
Field
Description
Parameter Code
The parameter codes supported for the
READ
/
WRITE
error counter pages are:
Code
Descriptions
0000h
Errors corrected without substantial delays
0001h
Errors corrected with possible delays
0002h
Total read/write errors
0003h
Total read/write errors
0004h
Total times correction algorithm processed. Always 0 for write errors
only.
0005h
Total bytes to/from tape (including ECC and Overhead)
0006h
Total uncorrected errors
8000h
WRITE
errors since last
READ
(page 02h)
or
READ
errors since last
WRITE
(page 03h)
8001h
Total raw write/read errors
8002h
Total dropout error count
8003h
Total servo tracking errors
9000h-
900Fh
Write only: Without substantial delay errors by channel
Read only: Raw sub-block read errors by channel
9080h-
908Fh
Write only: Possible delay errors assignable to specific channels
Note:
Many of these errors are write, not read, errors and are not to be
included in read error-rate calculations. If these errors are used to try to
identify bad channels, the bad channel may be on either the writing or
reading drive.
Note:
Parameter codes 00h, 01h, and 04h always return a value of 0.
DU
Disable Update. When set to 0, indicates that the drive updates all log parameter
values. When set to 1, indicates that the drive does not update the log parameter
values except in response to a
LOG SELECT
command. The drive sets this bit to 1
when accumulated values reach maximum. The drive also returns this bit set to 1
if the host set the bit in the last
LOG SELECT
command. Default is 0. Note that for
parameter types other than threshold and cumulative values, this bit is always set
to 0.
