Re: Recovery of RAID1 fails (added disks stays as spare)

[NeilBrown <neilb@suse.de>]

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On Mon, 19 Aug 2013 07:48:20 +0000 <Matthias.Blaesing@persona.de> wrote:

> Hey,

> > Strange.  I would definitely have expected one of those to start the
> > recovery.
> > Does anything appear in the kernel logs (e.g. output of 'dmesg')?
> 
> Please see the attaches boot.msg - from my perspective it only confirms the results
> gained from the /proc/mdstat and mdadm output.

I guess I should have been more explicit.
It looks like you have just attached a log of what happened at boot.
I mean does anything appear in the dmesg output when you try to add the spare
device to the array.

> 
> To give some more information - her the mdadm.conf:
> 
> s15434194:~ # cat /etc/mdadm.conf
> CREATE owner=root group=disk mode=0660 auto=yes
> 
> MAILADDR root
> 
> DEVICE containers partitions
> ARRAY /dev/md1 level=raid1 num-devices=2 devices=/dev/sda1,/dev/sdb1
> ARRAY /dev/md3 level=raid1 num-devices=2 devices=/dev/sda3,/dev/sdb3
> 
> 
> Could it be that the problem lies in the order in the devices row? When I compare the working md1 and the non-working md3 array I see a difference in the mapping of devices to numbers:

No, the order is irrelevant.

The experiment below wouldn't change anything.

NeilBrown

> 
> For md1:
> 
>    Number   Major   Minor   RaidDevice State
>        0       8        1        0      active sync   /dev/sda1
>        1       8       17        1      active sync   /dev/sdb1
> 
> For md3:
> 
>     Number   Major   Minor   RaidDevice State
>        0       8       19        0      active sync   /dev/sdb3
>        1       0        0        1      removed
> 
>        2       8        3        -      spare   /dev/sda3
> 
> 
> Would this be worth a try (the disks need approx. 24 hours to reach the rebuild-state, so I'm reluctant to try without some hope) to do:
> 
> 1. change the Array line in /etc/mdadm.conf for md3 to read (switching order):
> ARRAY /dev/md3 level=raid1 num-devices=2 devices=/dev/sdb3,/dev/sda3
> 2. Remove the spare sda3
> 3. Zero the superblock of sda3
> 4. Add sda3 again to the array
> 
> ?
> 
> Mit freundlichen Grüßen
> 
> Matthias Bläsing
> Abt IT
> KompetenzCenter
> 
> Tel.: 02351 950-344
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> mailto: matthias.blaesing@persona.de
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