[Ocfs2-devel] mounting a snapshot for backup.

[Marcos E. Matsunaga]

http://oss.oracle.com/projects/ocfs2-tools/news/article_7.html


see tunefs.ocfs2 note.


sylarrrrrrr at aim.com wrote:
> Hi
> I have an ocfs2 volume (1.4.1) on lvm2, which is made available on 2
> nodes via dual primary drbd that is on it. I wanted to backup my
> volume, so naturally I made a snapshot of it via the lvm2, and tried
> to mount it for backing up. However, I got the following error in dmesg :
> [319981.478168] (23483,0):ocfs2_fill_super:700 ERROR: Unable to create
> per-mount debugfs root.
> I then searched a bit, and found that ocfs2 can't mount an already
> mounted volume, and I was suggested to change the UUID of the snapshot
> device in order to be able to mount it.
> So I tried using tunefs.ocfs2 and got the following error:
> tunefs.ocfs2 1.4.1
> tunefs.ocfs2: Trylock failed while locking down the cluster
>
> So I searched a bit and found that there was a patch suggestion for
>  --force option to tunefs,
> http://oss.oracle.com/pipe rmail/ocfs2-devel/2008-July/002447.html
> and that it was rejected,
> http://oss.oracle.com/pipermail/ocfs2-devel/2008-July/002449.html
> and some ominous warnings,
> http://oss.oracle.com/pipermail/ocfs2-devel/2008-July/002450.html
> o well... now how am I supposed to backup my live ocfs2 volume? Make a
> virtual machine that will have just that snapshot device?
>
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