Re: [Fwd: Re: recorvery from Raid5 multiple disk failture]

Re: [Fwd: Re: recorvery from Raid5 multiple disk failture]

[Hendrik Naumann]

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Hi

Our suggestion worked out nicely so I could recover the data from the 
raid.

Thanks 

Hendrik Naumann


Am Freitag, 16. Dezember 2005 18:26 schrieben Sie:
> On Fri, 2005-12-16 at 06:45, Hendrik Naumann wrote:
> > Hi
> >
> > I have a Linux-Software-Raid5 consisting of three partitions
> > (hda2, hde2 and hdf2). After a failure of hdf I replaced the disk
> > and added hdf2 into the raid again. During the resynchronization
> > process hda broke down.
> >
> > I am not completely shure how much of the synchronization
> > was already done, but I think it was quite at the end, because
> > the gzipped dd-image of hdf2 and hde2 have very similar sizes.
> >
> > mdadm shows hde2 as a active, clean disk within the raid and hdf2
> > as a clean spare disk. In the Software-Raid-Howto it was stated
> > that rewriting the superblocks (I suspect hdf2 to clean active)
> > could be a possibility to regain some data from the Raid.
> >
> > How is this possible with mdadm? Or is there some other tool for
> > manipulation the superblocks?
> >
> > Many thanks in advance
> >
> > Hendrik Naummann
> >
> > PS. Please add a CC hn75@gmx.de because up to now I am no
> > subscriber to this list.
>
> Since the recovery did not finish, I would do the followings:
>
> mdadm --examine /dev/hde2 to display the raid5 configuration and
> note the chunksize, parity layout, disks order,..
> Recreate the array using mdadm -C with "missing" keyword
> Mount the raid5 array read-only (hope that it will mount :)


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