Reference Guide

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