Re: RAID1, changed disk, 2nd has errors ...

["Mathias Burén" <mathias.buren@gmail.com>]

On 26 August 2011 12:46, Stefan G. Weichinger <lists@xunil.at> wrote:
>
> Please help:
>
> Today I removed a defective hdd out of a RAID1-array and swapped in a
> new hdd instead.
>
> 3 arrays, to be true, md[012]
>
> 0 and 1 synced fine, in the process of syncing md2 the old sda threw
> errors (in sda4):
>
> md/raid1:md2: sda: unrecoverable I/O read error for block 643686144
> md: md2: recovery done.
>
> [...]
>
> md/raid1:md2: sda: unrecoverable I/O read error for block 643686272
>
> ----
>
> Did the system stop syncing or is "recovery done" the indication that
> md2 was fully recovered BEFORE the system threw sda4 out of the array??
>
> I hope for the second!
>
> See:
>
> # mdadm -D /dev/md2
> /dev/md2:
>        Version : 0.90
>  Creation Time : Thu Feb 11 19:40:11 2010
>     Raid Level : raid1
>     Array Size : 962454080 (917.87 GiB 985.55 GB)
>  Used Dev Size : 962454080 (917.87 GiB 985.55 GB)
>   Raid Devices : 2
>  Total Devices : 2
> Preferred Minor : 2
>    Persistence : Superblock is persistent
>
>    Update Time : Fri Aug 26 13:40:55 2011
>          State : clean, degraded
>  Active Devices : 1
> Working Devices : 2
>  Failed Devices : 0
>  Spare Devices : 1
>
>           UUID : 0ee7bbc7:fc6b0172:d195d856:5f94e963
>         Events : 0.1833443
>
>    Number   Major   Minor   RaidDevice State
>       0       8        4        0      active sync   /dev/sda4
>       1       0        0        1      removed
>
>       2       8       20        -      spare   /dev/sdb4
>
> # cat /proc/mdstat
> Personalities : [raid1]
> md1 : active raid1 sdb3[1] sda3[0]
>      13679232 blocks [2/2] [UU]
>
> md2 : active raid1 sdb4[2](S) sda4[0]
>      962454080 blocks [2/1] [U_]
>
> md0 : active raid1 sdb1[1] sda1[0]
>      128384 blocks [2/2] [UU]
>
> unused devices: <none>
>
> ----
>
> The system seems to work OK, md2 which is a PV in a LVM-volumegroup is
> there, etc
>
> I just wonder if should somehow re-add sda4 or not touch a thing until I
> have a new hdd at hand??
>
> Can/should I somehow test the integrity of md2?
>
> Pls help me to relax in this case ...
>
> btw:
>
> Linux version 2.6.36-gentoo-r5
> mdadm-3.1.4
>
> Thanks in advance, Stefan!
>
>
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Hm,

Could you perhaps post the output of "smartctl -a /dev/sda" (and sdb
for completeness sake) here? You can find smartctl in the
smartmontools package.

/Mathias
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