Jon Hardcastle <jd_hardcastle@xxxxxxxxx> writes: > --- On Thu, 28/1/10, Goswin von Brederlow <goswin-v-b@xxxxxx> wrote: > >> From: Goswin von Brederlow <goswin-v-b@xxxxxx> >> Subject: Re: Why does one get mismatches? >> To: linux-raid@xxxxxxxxxxxxxxx >> Date: Thursday, 28 January, 2010, 20:24 >> "Tirumala Reddy Marri" <tmarri@xxxxxxxx> >> writes: >> >> > 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. >> > 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 how the buffers >> are handled ? may they >> > are cached ? >> > >> > >> > -Marri >> >> 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. >> >> MfG >> Goswin >> -- >> To unsubscribe from this list: send the line "unsubscribe >> linux-raid" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > i think my RAM is fecked - does that sound like a possible cause? memtest86 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.. 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" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
