Date: Wed, 25 Mar 2009 19:38:32 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: Mark Powell <M.S.Powell@salford.ac.uk> Cc: Alexander Leidinger <Alexander@Leidinger.net>, FreeBSD Current <freebsd-current@freebsd.org>, Daniel Eriksson <daniel@toomuchdata.com>, ticso@cicely.de, kevin <kevinxlinuz@163.com> Subject: Re: Apparently spurious ZFS CRC errors (was Re: ZFS data error without reasons) Message-ID: <20090325183831.GD16409@cicely7.cicely.de> In-Reply-To: <20090325180054.L87213@rust.salford.ac.uk> References: <49BE4EC1.90207@163.com> <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>
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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. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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