User's Manual

DLT4000 SCSI Interface
DLT4000/DLT4500/DLT4700 Cartridge Tape Subsystem 8-51
8.4.9.3 Read/Write Error Recovery Page (01h)
The drive supports the Error Recovery Page which has the following format:
Bit
7 6 5 4 3 2 1 0
0 PS(0) 0 Page Code (01h)
1 Additional Page Length (0Ah)
2 rsvd rsvd TB rsvd EER PER DTE DCR
Byte 3 Read Retry Count
4 Reserved
5 Reserved
6 Reserved
7 Reserved
8 Write Retry Count
9 Reserved
10 Reserved
11 Reserved
Figure 8-32 Error Recovery Page Format
In this page, only the Post Error (PER) flag parameter is changeable. If PER is set,
Check Conditions will be created, with Sense Key of Recovered Error, and VU Sense
Data detailing the cause. Normally, these events should be rare, and only occur if the
recovered write or read retry rates reach excessive levels.
Option Flags
• TB - The Transfer Block (when not fully recovered) function is not supported.
• EER - The Enable Early Recovery function is always enabled.
• PER - The Post Error bit turns on reporting of Check Condition to report
recovered read/write errors. The default setting of this bit is zero.
• DTE - The Disable Transfer on Error feature is not supported so this bit must be
zero.
• DCR - The Disable ECC Correction bit feature is not supported so this bit must be
zero.
Read Retry Count
This field reports the maximum number of rereads that are done before declaring an
unrecoverable error.