Date: Wed, 25 Mar 2009 21:35:58 +0100 From: "Alexey Shuvaev" <shuvaev@physik.uni-wuerzburg.de> To: ticso@cicely.de Cc: FreeBSD Current <freebsd-current@freebsd.org>, Mark Powell <M.S.Powell@salford.ac.uk> Subject: Re: Apparently spurious ZFS CRC errors (was Re: ZFS data error without reasons) Message-ID: <20090325203558.GA4533@wep4035.physik.uni-wuerzburg.de> In-Reply-To: <20090325183831.GD16409@cicely7.cicely.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>
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On Wed, Mar 25, 2009 at 07:38:32PM +0100, Bernd Walter wrote: > On Wed, Mar 25, 2009 at 06:04:08PM +0000, Mark Powell wrote: > > On Wed, 25 Mar 2009, Bernd Walter wrote: > > > > >On Wed, Mar 25, 2009 at 03:21:28PM +0100, Alexander Leidinger wrote: > > >I wouldn't be surprised if the problem is in the drive firmware. > > >Preread and wc both have the potential to put a lot load to the drives > > >and can trigger bugs that otherwise wouldn't matter. > > > > I've emailed WD support for more info. Not expecting much though. > > From reading other threads on these Green Power drives them seem rather > > crap. This is my model and firmware: > > > > http://www.datacent.com/datarecovery/hdd/western_digital/WD10EADS-00L5B1 > > > > There's some head park problem too, but with 5s ZFS sync I don't think it > > applies in this case: > > > > http://www.silentpcreview.com/forums/viewtopic.php?t=51401&postdays=0&postorder=asc&start=120&sid=a1caf68d80ef8fecc5d9e86defde4c19 > > http://kerneltrap.org/mailarchive/linux-kernel/2008/4/9/1386304 > > > > >I also have a system running WD drives and ECC RAM which show CRC errors > > >from time to time, while all other systems have no CRC problem at all. > > > > Interesting. Are those CRC problems with WC on or off? > > WC is on, prefetch is off, but only because it had bad performance with > MySQL. > Drives are <WDC WD3200AAKS-00SBA0/12.01B01> Serial ATA II > I don't know if it is with the drives, but other reasons are less > likely in my opinion. > The system is located in a data center and since I only get a few errors > I decided to live with it and not to debug it further. > Hello! Me too... 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) FWIW, Alexey.
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