From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jon Hardcastle Subject: Re: Why does one get mismatches? Date: Fri, 29 Jan 2010 07:37:05 -0800 (PST) Message-ID: <166572.83607.qm@web51301.mail.re2.yahoo.com> References: <874om6m0z5.fsf@frosties.localdomain> Reply-To: Jon@eHardcastle.com Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <874om6m0z5.fsf@frosties.localdomain> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org, Goswin von Brederlow List-Id: linux-raid.ids --- On Thu, 28/1/10, Goswin von Brederlow wrote: > From: Goswin von Brederlow > Subject: Re: Why does one get mismatches? > To: linux-raid@vger.kernel.org > Date: Thursday, 28 January, 2010, 20:24 > "Tirumala Reddy Marri" > writes: >=20 > > I just tried and miss-match count is zero. > Interesting, is XOR engine > > doing something wrong ? . Then I ran a test where I > raw-write the file > > to /dev/md0. Then did the raw-read for the same size. > In this case XOR > > matched as expected. Then I failed a drive using > "mdadm -f /dev/md0 > > /dev/sda". Then I read the same size data again from > /dev/md0. And > > checksum matches too.=20 > > What is this mean XOR engine is doing right thing. But > "chec/repair" > > test is not functioning properly with XOR-engine ? > > > > Or is this something to do with=A0 how the buffers > are handled ? may they > > are cached ? > > > > > > -Marri >=20 > No idea. But if everything works without the XOR engine and > gives > mismatches with then I would think there is a software or > hardware error > there and not in the cable or disks. >=20 > MfG > =A0 =A0 =A0 =A0 Goswin > -- > To unsubscribe from this list: send the line "unsubscribe > linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at=A0 http://vger.kernel.org/majordomo-info.html >=20 i think my RAM is fecked - does that sound like a possible cause? memte= st86 gives PAGES of red errors when run but the POST gives nothing and = the machine boots.... it has 512MB i have some more on order as a speculative..=20 =20 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html