On Mon, 9 Jul 2012 13:02:04 +0200 Dietrich Heise <dh@xxxxxxx> wrote: > Hello, > > thanks for the hint. > > I do a backup with dd before that, I hope I can get back the data of the raid. > > The following is in the syslog: > > Jul 8 19:21:15 p3 kernel: Buffer I/O error on device dm-1, logical > block 365625856 > Jul 8 19:21:15 p3 kernel: Buffer I/O error on device dm-1, logical > block 365625856 > Jul 8 19:21:15 p3 kernel: lost page write due to I/O error on dm-1 > Jul 8 19:21:15 p3 kernel: lost page write due to I/O error on dm-1 > Jul 8 19:21:15 p3 kernel: JBD: I/O error detected when updating > journal superblock for dm-1. > Jul 8 19:21:15 p3 kernel: JBD: I/O error detected when updating > journal superblock for dm-1. > Jul 8 19:21:15 p3 kernel: RAID conf printout: > Jul 8 19:21:15 p3 kernel: RAID conf printout: > Jul 8 19:21:15 p3 kernel: --- level:5 rd:4 wd:2 > Jul 8 19:21:15 p3 kernel: --- level:5 rd:4 wd:2 > Jul 8 19:21:15 p3 kernel: disk 0, o:1, dev:sdf1 > Jul 8 19:21:15 p3 kernel: disk 0, o:1, dev:sdf1 > Jul 8 19:21:15 p3 kernel: disk 1, o:1, dev:sde1 > Jul 8 19:21:15 p3 kernel: disk 1, o:1, dev:sde1 > Jul 8 19:21:15 p3 kernel: disk 2, o:1, dev:sdc1 > Jul 8 19:21:15 p3 kernel: disk 2, o:1, dev:sdc1 > Jul 8 19:21:15 p3 kernel: disk 3, o:0, dev:sdd1 > Jul 8 19:21:15 p3 kernel: disk 3, o:0, dev:sdd1 > Jul 8 19:21:15 p3 kernel: RAID conf printout: > Jul 8 19:21:15 p3 kernel: RAID conf printout: > Jul 8 19:21:15 p3 kernel: --- level:5 rd:4 wd:2 > Jul 8 19:21:15 p3 kernel: --- level:5 rd:4 wd:2 > Jul 8 19:21:15 p3 kernel: disk 0, o:1, dev:sdf1 > Jul 8 19:21:15 p3 kernel: disk 0, o:1, dev:sdf1 > Jul 8 19:21:15 p3 kernel: disk 1, o:1, dev:sde1 > Jul 8 19:21:15 p3 kernel: disk 1, o:1, dev:sde1 > Jul 8 19:21:15 p3 kernel: disk 2, o:1, dev:sdc1 > Jul 8 19:21:15 p3 kernel: disk 2, o:1, dev:sdc1 > Jul 8 19:21:15 p3 kernel: md: recovery of RAID array md0 > Jul 8 19:21:15 p3 kernel: md: recovery of RAID array md0 > Jul 8 19:21:15 p3 kernel: md: minimum _guaranteed_ speed: 1000 KB/sec/disk. > Jul 8 19:21:15 p3 kernel: md: minimum _guaranteed_ speed: 1000 KB/sec/disk. > Jul 8 19:21:15 p3 kernel: md: using maximum available idle IO > bandwidth (but not more than 200000 KB/sec) for recovery. > Jul 8 19:21:15 p3 kernel: md: using maximum available idle IO > bandwidth (but not more than 200000 KB/sec) for recovery. > Jul 8 19:21:15 p3 kernel: md: using 128k window, over a total of 1465126400k. > Jul 8 19:21:15 p3 kernel: md: using 128k window, over a total of 1465126400k. > Jul 8 19:21:15 p3 kernel: md: resuming recovery of md0 from checkpoint. > Jul 8 19:21:15 p3 kernel: md: resuming recovery of md0 from checkpoint. > > I think the right order is sdf1 sde1 sdc1 sdd1, I am right? Yes, that looks right. > > So I have to do: > > mdadm -C /dev/md1 -l5 -n4 -e 1.2 -c 512 /dev/sdf1 /dev/sde1 missing /dev/sdd1 > > The question is: sould I also add --assume-clean --assume-clean makes no difference to a degraded raid5 so it doesn't really matter. However I always suggest using --assume-clean when re-creating an array so on principle I would say "yes - you should add --assume-clean". NeilBrown > > Thanks! > Dietrich >
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