xfs_repair takes long time

[Christoph Hellwig]

On Thu, Feb 02, 2012 at 03:19:01AM -0500, Kiran.Chandapu at emc.com wrote:
> So I have realized that the file system might have corrupted and started running xfs_repair but it takes such a long time, not sure it is because of the amount of data we have on the volume around 12TB.
> First time it took 3 days, incomplete and unfortunately the session got terminated. Now again I have to run the repair.
> 
> Could anyone please let me know, is there any way I can speed up the process or any rough idea who much time the file system repair going to take.

Grab the latests version from
git://git.kernel.org/pub/scm/fs/xfs/xfsprogs-dev.git, and run it in
verbose mode (xfs_repair -v).

I suspect you actually have a a volume that doesn't resemble a
filesystem anymore and it's looking for a superblock but can't find it.