Chapter 4 SCSI Commands
LOG SELECT Command (4Ch)
DLT-S4 Interface Reference Guide
62
Parameter Code
(continued)
8001h
Total raw write error flags
8002h
Total dropout error count
8003h
Total servo tracking errors
9000h-
900Fh
Without substantial delay errors by channel
9080h-
908Fh
Write only: Possible delay errors assignable to specific channels
Read only: Raw sub-block read errors by channel
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 have a value of 0. Parameter value for 05h
is eight bytes; the Parameter Length field is set to 8.
DU
Disable Update. This bit is not defined for
LOG SELECT
; the drive ignores any value
in DU.
DS
Disable Save. DS and Target Save Disable (TSD) must be set to 1.
TSD
Target Save Disable. TSD and DS must be set to 1.
ETC
Enable Threshold Comparison. When set to 1, the drive performs a comparison with
threshold values once the cumulative value is updated. Comparison criteria are
defined in Threshold Met Criteria (TMC). If the comparison is met and the RLEC bit
of
MODE SELECT
/ SENSE
Control Page 0Ah is set to 1, the drive generates a
UNIT
ATTENTION
for all initiators. The drive sets the Additional Sense Code to
THRESHOLD CONDITION MET
. If the RLEC bit is 0 and the comparison is met, the
drive does not generate a
UNIT ATTENTION
.
TMC
Threshold Met Criteria. Once the criteria specified in this field are met, the ETC bit is
1, and the RLEC bit in the
MODE SENSE / SELECT
Control Page is set to 1, the drive
generates a
UNIT ATTENTION
for all initiators.
The criteria for comparison are:
Code
Basis of Comparison
00b
Every update of the cumulative value
01b
Cumulative value equal to threshold value
10b
Cumulative value not equal to threshold value
11b
Cumulative value greater than threshold value
Field
Description
