Re: recovering a mirrored arry.

[Keld Simonsen <keld@keldix.com>]

On Fri, Feb 05, 2010 at 10:06:38PM +0000, Kristleifur Daðason wrote:
> On Fri, Feb 5, 2010 at 6:50 PM, Keld Simonsen <keld@keldix.com> wrote:
> > 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
> >
> 
> Hmmm ... I guess your version of mdadm may be too old. Which version
> do you have?

v2.5.3

best regards
keld
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