On Thu, Mar 29, 2012 at 06:29:14PM -0500, Kirk Anderson wrote: > These two matched. > > root@LS-QLF55:~# dd if=/dev/sda6 bs=512 count=1 2> /dev/null | hexdump -C > > dump_sda6.txt > root@LS-QLF55:~# dd if=/dev/md2 bs=512 count=1 2> /dev/null | hexdump -C > > dump_md2.txt > root@LS-QLF55:~# diff dump_sda6.txt dump_md2.txt > root@LS-QLF55:~# > > root@LS-QLF55:~# dd if=/dev/md2 bs=512 count=4 2> /dev/null | hexdump -C > 00000000 58 46 53 42 00 00 10 00 00 00 00 00 2b 4e 92 c0 > |XFSB........+N..| > 00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > |................| > 00000020 1b 5a c5 ad cc e3 40 11 87 4d f5 8e 9b f8 37 c0 > |.Z....@..M....7.| > 00000030 00 00 00 00 20 00 00 07 00 00 00 00 00 00 01 00 |.... > ...........| > 00000040 00 00 00 00 00 00 01 01 00 00 00 00 00 00 01 02 > |................| > 00000050 00 00 00 30 01 5a 74 a0 00 00 00 20 00 00 00 00 |...0.Zt.... > ....| > 00000060 00 00 80 00 3d 84 10 00 01 00 00 10 00 00 00 00 > |....=...........| > 00000070 00 00 00 00 00 00 00 00 0c 0c 08 04 19 00 00 19 > |................| > 00000080 00 00 00 00 00 04 50 c0 00 00 00 00 00 00 02 ce > |......P.........| > 00000090 00 00 00 00 0b ba 45 ab 00 00 00 00 00 00 00 00 > |......E.........| > 000000a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > |................| > 000000b0 00 00 00 00 00 00 00 02 00 00 00 10 00 00 00 30 > |...............0| > 000000c0 00 0c 10 00 00 00 10 00 00 00 00 00 00 00 00 00 > |................| > 000000d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > |................| > * > 00000800 The AGF, AGI and AGFL have all been zeroed. Something has overwritten them. Your filesysetm is likely to be toast. > > > root@LS-QLF55:~# xfs_db -c "sb 0" -c p -c "agf 0" -c p -c "agi 0" -c p > /dev/md2 > cache_node_purge: refcount was 1, not zero (node=0xb1698) > xfs_db: cannot read root inode (22) And that means the zeroing has extended well into the filesystem, and your root directory has been lost. There's really not that much that reapir can do for you at this point execpt make a mess. There is no AGI left to find where in-use inodes might live to recover them, and the directory structure cannot be used to find them, either, so I think the only thing you can do now is start on disaster recovery. Christoph had a patch to xfs_repair that allowed it to run xfs_irecover like functionality - I don't think he ever posted it, so you might just have to find the original xfs_irecover utility and make use of that to extract whatever you can from the busted filesystem. Other than that, I think that there's little we can do to help you recover the filesystem intact at this point.... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
