Ext3 users - Mar 2003 - X-Post from Linux-RAID [Re: I just trashed my RAID5 array - recovery possible?]

Hi,

originally I posted this to linux-raid@vger.kernel.org, but I guess
there are chances that someone in here might comment on it as well.
TIA.

* Neil Brown <neilb@cse.unsw.edu.au> [2003-03-20
10:58]:
> On Thursday March 20, lists@schlich.org wrote:
> > 
> > And when I try to mount the array:
> > --8<--
> > EXT3-fs error (device md(9,1)): ext3_check_descriptors: Block bitmap
for group 509 not in group (block 4294967295)!
> > EXT3-fs: group descriptors corrupted !
> > --8<--
> > 
> > What should I do now? Raidhotadd the 4th device? Run e2fsck prior to
> > that or afterwards?
> 
> I would 
>    fsck -n /dev/md1
> to non-distructively see how much damage there is.
> 
> If that shows an uncomfortable large amount of damage, you could
> assembling the array from a different triple of devices.
> It is currently assemble from
>    /dev/hd[gki]1
I've put up the logfile of fsck at
http://wolfram.schlich.org/tmp/fsck.log.1
I have no idea whether this is an "uncomfortable large amount of
damage", so would you mind having a look at it? :-) TIA!
> If you want to try g, k and e for example, use
>   mdadm -Af /dev/md1 /dev/hd[gke]1
> 
> and then try "fsck -n" on that.
> 
> I wouldn't hot-add the fourth drive until you have decided you will
> live with whatever you have.
Ok. Well, hde was the first drive that was kicked out, hdg came
afterwards, so hd[gik] should probably be the best combination?!
-- 
Mit freundlichen Gruessen / Yours sincerely
Wolfram Schlich; Friedhofstr. 8, D-88069 Tettnang; +49-(0)178-SCHLICH