How to fix bad superblock or xfs_repair: error - read only 0 of 512 bytes

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Hello,

I'm having some very serious issues with XFS after upgrading from a Linux Distro running Ubuntu 2.6.32 to 3.2.

It seems like my filesystems are damaged after attaching them to a Linux 3.2 server. I am also no longer able to mount the hdd on the old server that is still running 2.6.32!

'test disk' does find the filesystem as XFS 4 and i created a 1.5TB dump of it to another hdd.

(I created the xfs filesystem on the entire hdd, not on a partition, so /dev/sdd is not a typo)

$ sudo mount -t xfs /dev/sdd /media/
mount: /dev/sdd: can't read superblock
(dmesg)
[236659.912663] attempt to access beyond end of device
[236659.912667] sdd: rw=32, want=2930277168, limit=2930275055
[236659.912670] XFS (sdd): last sector read failed

$ sudo xfs_check /dev/sdd
xfs_check: error - read only 0 of 512 bytes

$ sudo xfs_repair /dev/sdd
Phase 1 - find and verify superblock...
xfs_repair: error - read only 0 of 512 bytes


'testdisk' does find the filesystem as XFS 4 and i created a 1.5TB dump of it to another hdd.

Is there any way I can fix this? - Except restroring from backup? Because this IS my backup!
see ubuntuforums.org/showthread.php?t=1910962 for more details…


Any help is appreciated!

Thanks in advance
Chris
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