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Date:      Thu, 26 Mar 2009 09:02:15 +0000 (GMT)
From:      "Mark Powell" <M.S.Powell@salford.ac.uk>
To:        Alexey Shuvaev <shuvaev@physik.uni-wuerzburg.de>
Cc:        FreeBSD Current <freebsd-current@freebsd.org>, ticso@cicely.de, Mark Powell <M.S.Powell@salford.ac.uk>
Subject:   Re: Apparently spurious ZFS CRC errors (was Re: ZFS data error without reasons)
Message-ID:  <20090326090147.D87213@rust.salford.ac.uk>
In-Reply-To: <20090325203558.GA4533@wep4035.physik.uni-wuerzburg.de>
References:  <20090320102824.W75873@rust.salford.ac.uk> <20090320152737.D641@rust.salford.ac.uk> <20090325105613.55624rkkgf2xkr6s@webmail.leidinger.net> <20090325103721.G67233@rust.salford.ac.uk> <20090325135528.21416hzpozpjst8g@webmail.leidinger.net> <20090325125930.U73916@rust.salford.ac.uk> <20090325152128.2389990h7v6a02co@webmail.leidinger.net> <20090325152940.GB16409@cicely7.cicely.de> <20090325180054.L87213@rust.salford.ac.uk> <20090325183831.GD16409@cicely7.cicely.de> <20090325203558.GA4533@wep4035.physik.uni-wuerzburg.de>

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On Wed, 25 Mar 2009, Alexey Shuvaev wrote:

> I don't use zfs, just ufs2 + soft updates, but I see sometimes rather
> heavy data corruption (most often on / filesystem).
> No kernel messages, I can shut down the system successfully just
> to find the remnants of filesystems on the next boot.
> It doesn't happen often, I think compiling ports in a jail + some
> activity in the host increase the probability of a failure.
>
> The drive is:
> ATA channel 3:
>    Master:  ad6 <WDC WD5000AAKS-00C8A0/12.01C02> SATA revision 2.x
>
> hw.ata.wc=1 (default)

Have you tried turning WC off to see if it improves matters?
   Cheers.

-- 
Mark Powell - UNIX System Administrator - The University of Salford
Information & Learning Services, Clifford Whitworth Building,
Salford University, Manchester, M5 4WT, UK.
Tel: +44 161 295 6843  Fax: +44 161 295 5888  www.pgp.com for PGP key



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