Re: [linux-lvm] Re: lvextend error on XFS

[David Greaves <david dgreaves com>]

Frank J. Buchholz wrote:

> > > I then noticed that the filesystem on LogVol00 was no longer available
> > > and when I ran xfs_repair it stated the following:
> > > # xfs_repair /dev/Volume00/LogVol00 Phase 1 - find and verify 
> > > superblock...
> > > superblock read failed, offset 0, size 524288, ag 0, rval 0
> > >
> > > fatal error -- Invalid argument
> Hello Måns
> I now realize how I created this problem, I just don't know how to fix 
> it.
>
> I mistakingly added /dev/sba as the physical volume to a volume group 
> that contained /dev/sba1, the one partition on sba.  These are 
> essentially one in the same.  So when I executed the lvextend command 
> device-mapper had an error.  I'm honestly surprised it did anything, 
> especially write over the superblock on the filesystem.
>
> Any direction on how I can recover from within LVM?  I never was able 
> to execute the xfs_grow so I'm hoping the data in the filesystem still 
> exists.

try
xfs_repair -n -o /dev/Volume00/LogVol00
Then remove the -n

(man xfs_repair)

David