[NCLUG] Need help with ether md raid or possibly ext4 corrupted group descriptors

[Mike Jensen]

I did not think I needed a super block because it should use the ones that
existed from the current array.  I thought --create was to create a new
array, and overwrite the superblocks thus forgetting the previous raid
configuration.

I think the reason the rescue cd could not find and mount the array is
because /etc/mdadm.conf was contained on the array, so it could not
remember how to rebuild the previous configuration.  If I told it to mount
the drives it would say "no linux partitions found".

Needless to say, I just decided to format.  I need my computer, and my
backups have everything that is really that critical to me.  Just a pain
:-(

Thanks for your guys help.  If you have any more ideas as to what caused
this problem, or notes for the future in how I maybe could have solved it
I would still love to hear them.
cheers,
Mike Jensen
jent at afkfoo.com

On Sat, January 31, 2009 13:44, Kevin Fenzi wrote:
> On Fri, 30 Jan 2009 10:39:20 -0700 (MST)
> "Mike Jensen" <jent at afkfoo.com> wrote:
>
> ...snipp...
>
>> I used the command: mdadm --build /dev/md0 --level=0
>> --raid-devices=3 /dev/sda2 /dev/sdb1 /dev/sdc1
>
> That is very unlikely to be what you wanted to do. --build makes a new
> array with no superblocks. :(
>
> BUILD MODE
>        Usage:  mdadm  --build  md-device  --chunk=X  --level=Y
> --raid-devices=Z devices
>
>        This  usage  is similar to --create.  The difference is that it
>        creates an array without a superblock. With  these  arrays
>        there  is  no  difference between  initially  creating  the
>        array  and  subsequently assembling the array, except that
>        hopefully there is useful  data  there  in  the  second case.
>
> Rescue mode should have started it I would think... not sure why it
> wouldn't. Perhaps a drive dropped out? what does /proc/mdadm say?
>
> ...snipp...
>
> kevin
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