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Message-ID: <73e903671003191126l6c0bed69q69c32bf37922690d@mail.gmail.com> Date: Fri, 19 Mar 2010 18:26:18 +0000 From: Kristleifur Daðason <kristleifur@...il.com> To: linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: BUG:write data to degrade raid5 On Fri, Mar 19, 2010 at 6:20 PM, Joachim Otahal <Jou@....net> wrote: > jin zhencheng schrieb: >> >> hi; >> >> i use kernel is 2.6.26.2 >> >> what i do as follow: >> >> 1, I create a raid5: >> mdadm -C /dev/md5 -l 5 -n 4 /dev/sda /dev/sdb /dev/sdc /dev/sdd >> --metadata=1.0 --assume-clean >> >> 2, dd if=/dev/zero of=/dev/md5 bs=1M& >> >> write data to this raid5 >> >> 3, mdadm --manage /dev/md5 -f /dev/sda >> >> 4 mdadm --manage /dev/md5 -f /dev/sdb >> >> if i faild 2 disks ,then the OS kernel display OOP error and kernel down >> >> do somebody know why ? >> >> Is MD/RAID5 bug ? >> > > RAID5 can only tolerate ONE drive to fail of ALL members. If you want to be > able to fail two drives you will have to use RAID6 or RAID5 with one > hot-spare (and give it time to rebuild before failing the second drive). > PLEASE read the documentation on raid levels, like on wikipedia. > That is true, but should we get a kernel oops and crash if two RAID5 drives are failed? (THAT part looks like a bug!) Jin, can you try a newer kernel, and a newer mdadm? -- Kristleifur -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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