User's Manual

DLT2000 SCSI Interface
DLT2000/DLT2700 Cartridge Tape Subsystem 8-39
Parameter Code
The following parameter codes are supported for the read/write error counter pages.
Parameter
Code Description
00h
01h
02h
03h
04h
05h
06h
8000h
Errors corrected with substantial delays
Errors corrected with possible delays
Total rewrites or rereads
Total errors corrected
Total times correction algorithm processed
Total bytes processed
Total uncorrected errors
Vendor Unique
Figure 8-22 Parameter Codes Supported
Parameter codes 00h, 01h, and 04h will always return a value of zero.
DU, DS, TSD, ETC, TMC, and LP are collectively referred to as parameter control
byte.
•= DU–Disable Update: A zero value indicates that target shall update all log
parameter values. A value of 1 indicates that target will not update the log
parameter values except in response to LOG SELECT. This bit is set by the drive
when accumulated values reach maximum. This is also returned set if the host set
the bit in the last LOG SELECT command. The default is zero.
_________________________ Note _____________________________
For parameter types other than threshold and cumulative values, this bit is
always zero.
___________________________________________________________
• DS–Disable Save: Saving parameters is not supported; this bit will always be set to
1.
• TSD–Target Save Disable: Saving parameters is not supported; this bit will always
be set to 1.
• ETC–Enable Threshold Comparison: ETC of 1 indicates that comparison to
threshold is performed. ETC of zero indicates that this comparison is not
performed. This bit is set to 1 by MODE SELECT. Default is zero.
• TMC–Threshold Met Criteria: This field is valid only if host sets ETC to 1. It
determines the basis for comparison and is specified by host by LOG SELECT. If
the result of comparison is true (cumulative = threshold) and MODE
SELECT/SENSE control mode page RLEC bit is set 1, then a unit attention is