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From: Don Bowman <don@sandvine.com>
To: Don Bowman <don@sandvine.com>,
	"'freebsd-scsi@freebsd.org'" <freebsd-scsi@freebsd.org>
Date: Fri, 8 Aug 2003 11:14:57 -0400 
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Subject: RE: Unrecovered read error on scsi drive
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> From: Don Bowman [mailto:don@sandvine.com]
> 
> I have a system which popped out this error after many [500?] hours
> of disk stress [swapping, dd]:
> 
> (da0:ahd0:0:0:0): READ(10). CDB: 28 0 0 c7 92 a0 0 0 28 0
> (da0:ahd0:0:0:0): MEDIUM ERROR info:c792bb asc:11,0
> (da0:ahd0:0:0:0): Unrecovered read error field replaceable unit: e4
> sks:80,86
> 
> However, it claims to have 0 defects:
> 
> # camcontrol defects 0:0:0 -f phys -G
> Got 0 defects.
> 
> How can this be? Are there other causes for this unrecovered 
> read error?

Sorry, i forgot to add, I have AWRE and ARRE enabled:

# camcontrol modepage 0:0:0 -m 1
AWRE (Auto Write Reallocation Enbld):  1
ARRE (Auto Read Reallocation Enbld):  1
TB (Transfer Block):  0
RC (Read Continuous):  0
EER (Enable Early Recovery):  0
PER (Post Error):  0
DTE (Disable Transfer on Error):  0
DCR (Disable Correction):  0
Read Retry Count:  11
Correction Span:  240
Head Offset Count:  0
Data Strobe Offset Count:  0
Write Retry Count:  5
Recovery Time Limit:  65535