Date: Wed, 25 Mar 2009 16:29:40 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: kevin <kevinxlinuz@163.com>, FreeBSD Current <freebsd-current@freebsd.org>, Mark Powell <M.S.Powell@salford.ac.uk>, Daniel Eriksson <daniel@toomuchdata.com> Subject: Re: Apparently spurious ZFS CRC errors (was Re: ZFS data error without reasons) Message-ID: <20090325152940.GB16409@cicely7.cicely.de> In-Reply-To: <20090325152128.2389990h7v6a02co@webmail.leidinger.net> References: <49BD117B.2080706@163.com> <4F9C9299A10AE74E89EA580D14AA10A635E68A@royal64.emp.zapto.org> <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>
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On Wed, Mar 25, 2009 at 03:21:28PM +0100, Alexander Leidinger wrote: > Quoting Mark Powell <M.S.Powell@salford.ac.uk> (from Wed, 25 Mar 2009 > 13:49:07 +0000 (GMT)): > > >On Wed, 25 Mar 2009, Alexander Leidinger wrote: > > >>NCQ is not supported yet in FreeBSD. Alexander Motin said he is > >>interested in implementing it, but I don't know about the status of > >>this. > > > >Ok. So vfs.zfs.vdev.max_pending is irrelevant for SATA currently? > > Cheers. > > Either that or it needs to be lowered. I don't know. 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 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. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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