AIX 5.3 JFS2 Superblock 깨졌을때.

JFS2 has two superblocks, one in logical block 1 and another in 31. If fsck cannot recover the problem, filesystem can be rescured by copying one superblock to the corrupted location by dd command:

# dd count=1 bs=4k skip=31 seek=1 if=/dev/thelv of=/dev/thelv

To my knowledge, there is no way other than restoring from last backup to revive a filesystem when the two superblocks are corrupted.