Matthew Dillon wrote:
If you are getting DMA timeouts, go to this URL:
Yes, I am.
http://wiki.freebsd.org/JeremyChadwick/ATA_issues_and_troubleshooting
I fall under the category of "ATA/SATA DMA timeout issues".
Then I would suggest going into /usr/src/sys/dev/ata (I think, on
FreeBSD), locate all instances where request->timeout is set to 5,
and change them all to 10.
cd /usr/src/sys/dev/ata
fgrep 'request->timeout' *.c
... change all assignments of 5 to 10 ...
Try that first. If it helps then it is a known issue. Basically
a combination of the on-disk write cache and possible ECC corrections,
remappings, or excessive remapped sectors can cause the drive to take
much longer then normal to complete a request. The default 5-second
timeout is insufficient.
If it does help, post confirmation to prod the FBsd developers to
change the timeouts.
I've just reproduced the problem, and will try hacking the code now to
see if the problem goes away.
Since the box won't take input, I can't tell the disk usage at the time
it dies. However, it seems to appear while running an Amanda backup, and
my network throughput hits about ~90 Mbps @ ~5 kpps.
I'll post back with results of the increase of the timeout.
Steve
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