From owner-freebsd-current@FreeBSD.ORG Wed Mar 25 20:46:30 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 9F3DC106566C for ; Wed, 25 Mar 2009 20:46:30 +0000 (UTC) (envelope-from army.of.root@googlemail.com) Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.157]) by mx1.freebsd.org (Postfix) with ESMTP id 1F63B8FC12 for ; Wed, 25 Mar 2009 20:46:29 +0000 (UTC) (envelope-from army.of.root@googlemail.com) Received: by fg-out-1718.google.com with SMTP id 19so685999fgg.12 for ; Wed, 25 Mar 2009 13:46:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from :user-agent:mime-version:to:subject:references:in-reply-to :content-type:content-transfer-encoding; bh=GqfrM04LpWyk0HEV2Mb8o2jrgbwQBFCZ+RnJSYHQO5Y=; b=hwckpRXOyAOfBAiZV5VN0HP83SMFV7AKLcmtHVZc9/iBrsetbNmfsitepiCdTzwNNE 0TApm+c0rwmz2btOLeDWtEsMfMfNNEl427orwHOwUa/3Xd2QE/82L3Wf4QdTa47qlUqH /nYy5l0NgsIxuqRLSkOQvrtGKHdPFejwdMwNM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; b=pPnAbp7Tictw3uap85kkiItp7z8u7+571kCGWSCpVyFze25oQJ/hSQWaH0V8l/5BsE Y4bnIV4C2dO7CobrFfKEDq6aqUZXrh2xMJs7SXnZV3mR1p7HWiNVqevD5qKNafzP7/rK 43w9l5n+v1mPW2RwsWhco4GeIHKqCn0f2LQzY= Received: by 10.86.76.16 with SMTP id y16mr381926fga.18.1238013989223; Wed, 25 Mar 2009 13:46:29 -0700 (PDT) Received: from ?192.168.2.24? (p5486C8AF.dip.t-dialin.net [84.134.200.175]) by mx.google.com with ESMTPS id d6sm3237394fga.7.2009.03.25.13.46.28 (version=TLSv1/SSLv3 cipher=RC4-MD5); Wed, 25 Mar 2009 13:46:28 -0700 (PDT) Message-ID: <49CA9823.9050605@googlemail.com> Date: Wed, 25 Mar 2009 21:46:27 +0100 From: "army.of.root" User-Agent: Thunderbird 2.0.0.17 (X11/20081028) MIME-Version: 1.0 To: FreeBSD Current 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> In-Reply-To: <20090325203558.GA4533@wep4035.physik.uni-wuerzburg.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: Apparently spurious ZFS CRC errors (was Re: ZFS data error without reasons) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Mar 2009 20:46:31 -0000 Alexey Shuvaev wrote: > 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 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 SATA revision 2.x > > hw.ata.wc=1 (default) > > FWIW, > Alexey. Hi :) Damn f**k ! - I just bought WD harddrives for my Workstation... is there any way to detect silent data corruption without ZFS ? best regards PS: Thanks for all your work, I'm looking soo forward to 8.0 I cant even tell you how much :)