XFS file system corrupted beyond repair?

XFS file system corrupted beyond repair?

[Fong Vang]

One of our servers cannot mount an XFS file system after reboot.  xfs_check
and xfs_repair cannot fix the problem.  Both indicate that there are no
valid superblock can be found.  Are there any tool that can help reconstruct
the file system.  Doing a hexdump of the partition, it appears there are
valid filenames still on there.  Also, the disk has no bad block or hardware
issues.

Is there anyone on the XFS development team that we can hire to examine the
file system more closely and see if it can be reconstructed?


[[HTML alternate version deleted]]

RE: XFS file system corrupted beyond repair?

[Mark Magpayo]

> -----Original Message-----
> From: xfs-bounce@oss.sgi.com [mailto:xfs-bounce@oss.sgi.com] On Behalf
Of
> Fong Vang
> Sent: Wednesday, January 23, 2008 9:16 AM
> To: xfs@oss.sgi.com
> Subject: XFS file system corrupted beyond repair?
> 
> One of our servers cannot mount an XFS file system after reboot.
> xfs_check
> and xfs_repair cannot fix the problem.  Both indicate that there are
no
> valid superblock can be found.  Are there any tool that can help
> reconstruct
> the file system.  Doing a hexdump of the partition, it appears there
are
> valid filenames still on there.  Also, the disk has no bad block or
> hardware
> issues.
> 
> Is there anyone on the XFS development team that we can hire to
examine
> the
> file system more closely and see if it can be reconstructed?
> 
> 
> [[HTML alternate version deleted]]
> 

Check the archive for a thread entitled "Repairing a possibly incomplete
xfs_growfs command?"  (It's pretty recent)  I had this issue last week
and the XFS guys were able to help me out.  Maybe there is something in
there that can help.  Most notably, check the output of this command:

# xfs_db -r -c 'sb 0' -c p <device>

If you see agcount = 160, then the solutions provided may apply to your
situation as well.

Cheers,

Mark

Re: XFS file system corrupted beyond repair?

[David Chinner]

On Wed, Jan 23, 2008 at 09:15:49AM -0800, Fong Vang wrote:
> One of our servers cannot mount an XFS file system after reboot.  xfs_check
> and xfs_repair cannot fix the problem.  Both indicate that there are no
> valid superblock can be found.

What happened before the reboot?

FWIW, is this on a md block device? If so, did it reconstruct correctly?

To find out what is in the superblock, can you post the output
of 'xfs_db -r -c "sb 0" -c p <dev>'?

Also, it could be instructive to see the exact errors check and
repair were outputting. Can you post the output of failing
xfs_repair/xfs_check?

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group