Re: RAID 5 : recovery after failure

[Guillaume Betous <guillaume.betous@gmail.com>]

Here is the 2nd message I received.
For now my RAID has restarted with only sdc, sde and sdf.

I don't know if /dev/sdb is still usable, or if this was only a
desynchro failure.
How to know ?

------------------------------------------------------------------------------------------

This is an automatically generated mail message from mdadm
running on sam

A FailSpare event had been detected on md device /dev/md127.

It could be related to component device /dev/sdb1.

Faithfully yours, etc.

P.S. The /proc/mdstat file currently contains the following:

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md127 : active raid5 sde1[2] sdb1[5](F) sdc1[0](F) sdd1[6] sdf1[4]
      5860535808 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/2] [__UU]
      [============>........]  recovery = 62.0%
(1212358192/1953511936) finish=854.7min speed=14451K/sec

2013/10/9 Mikael Abrahamsson <swmike@swm.pp.se>:
> On Wed, 9 Oct 2013, Guillaume Betous wrote:
>
>> Now, should I add the other drives ? How ?
>
>
> Depends on what the problem is.
>
> Is the initial drive that failed now totally unusable?
>
> In that case, just do mdadm --manage /dev/md0 --add /dev/sd<whatever> with a
> new drive.
>
> But you said you received a second error, was this a read error on one of
> good working drive (see other threads in archive) and so you don't have any
> read errors (the information on those bad sectors will now be lost), then
> you can resync properly.
>
> I strongly recommend going to RAID6 to solve this problem in the future.
>
> I recommend having
>
> for x in /sys/block/sd[a-z] ; do echo 180 > $x/device/timeout ; done
>
> in rc.local (or equivalent) to make sure you can handle timeouts properly
> even for consumer drives.
>
>
> --
> Mikael Abrahamsson    email: swmike@swm.pp.se



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