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To: Paul Mather <paul@gromit.dlib.vt.edu>
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cc: freebsd-current@freebsd.org
Subject: Re: Fatal TIMEOUT - WRITE_DMA errors return with ATA Mk.III
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Paul Mather wrote:
> Since somewhere in the 5.x release cycle, my system has fallen prey to
> the "TIMEOUT - WRITE_DMA" errors which result in the drive becoming
> detached (which causes my geom_mirror to break and require rebuilding).=

> According to smartctl and disk diagnostics, there's nothing wrong with
> my drives.  Plus, the problem does not manifest itself under 4-STABLE.
> (I'm not the only one to have reported this problem.)
>=20
> Lately, I'd had success using a patch posted to freebsd-current by Ian
> Dowse.  The "TIMEOUT - WRITE_DMA" errors still occurred, but they
> weren't fatal.  I updated my kernel and world recently, and, alas, the
> "TIMEOUT - WRITE_DMA" problem has returned once more:

You should try a recent -current, I committed cleanups to the timeout=20
system on the 21'st. You might still have timeouts (which might due to=20
non-ATA issues) but they should not be fatal unless the HW really does=20
screw up..

--=20

-S=F8ren