From mboxrd@z Thu Jan 1 00:00:00 1970 From: Goswin von Brederlow Subject: Re: Why does one get mismatches? Date: Sat, 30 Jan 2010 00:52:28 +0100 Message-ID: <87fx5owjsz.fsf@frosties.localdomain> References: <166572.83607.qm@web51301.mail.re2.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <166572.83607.qm@web51301.mail.re2.yahoo.com> (Jon Hardcastle's message of "Fri, 29 Jan 2010 07:37:05 -0800 (PST)") Sender: linux-raid-owner@vger.kernel.org To: Jon@eHardcastle.com Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Jon Hardcastle writes: > --- 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? mem= test86 gives PAGES of red errors when run but the POST gives nothing an= d the machine boots.... it has 512MB > > i have some more on order as a speculative..=20 If memtest gives errors you certainly have errors. The reverse isn't allways true. MfG Goswin -- 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