Re: recovering a mirrored arry.

[Keld Simonsen <keld@keldix.com>]

On Fri, Feb 05, 2010 at 04:25:02PM +0000, Kristleifur Daðason wrote:
> On Fri, Feb 5, 2010 at 1:19 AM, Keld Simonsen <keld@keldix.com> wrote:
> > On Wed, Feb 03, 2010 at 03:57:58AM +0100, Keld Simonsen wrote:
> > Hi
> >
> >
> > can anybody help me with this? I am stuck with recovering my system here.
> > is it a sensible thing ro do?
> >
> > best regards
> > keld
> >
> >> Hi
> >>
> >> I got 2 arrays in error of the raid10 type.
> >>
> >> I think this is because my motherboard died, and then the fs were
> >> corrupted.
> >>
> >> My thoughts were that actually one of the copies could be correct.
> >> So I would like to try out the consistency of each part of the raid10
> >> (it is 2-partition arrays), and then if I find one that is consistent, then
> >> resync the faulty one with the good one.
> >>
> >> How do I do this?
> >>
> >> it seems that I cannot just assemble an array with a missing part.
> >> If I assemble the full array, is there then a risk of the bad one
> >> corrupting the good one? And can I declare one of the disks faulty
> >> then test the other one, then declare nbr 2 disk for faulty and
> >> declare the first one as good?
> >>
> >> I dont see anything on the wiki on this.
> >>
> >> best regards
> >> keld
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> 
> 
> I wish I could help more, but check out this from the mdadm man page:
> 
>        To create a "degraded" array in which some devices are missing,
> simply give
>        the word "missing" in place of a device name.  This  will
> cause  mdadm  to
>        leave  the  corresponding  slot  in  the array empty.  For a
> RAID4 or RAID5
>        array at most one slot can be "missing"; for a  RAID6  array
> at  most  two
>        slots.   For a RAID1 array, only one real device needs to be
> given.  All of
>        the others can be "missing".

I tried missing, but mdadm said that it could not find missing as a device,
for assemble mode.

best regards
keld
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