Filesystem /dd_backup failed to mount after server crashs and reboots.
Get the following error while running fsck:
exec module “/sbin/helpers/jfs2/logredo64” failed
root [myaixLPAR] /tmp: fsck /dd_backup The current volume is: /dev/ddbkup1lv Primary superblock is valid. J2_LOGREDO:log redo processing for /dev/ddbkup1lv Fatal: I/O error exec module "/sbin/helpers/jfs2/logredo64" failed. logredo failed (rc=5). fsck continuing. Primary superblock is valid. *** Phase 1 - Initial inode scan *** Phase 2 - Process remaining directories *** Phase 3 - Process remaining files *** Phase 4 - Check and repair inode allocation map *** Phase 5 - Check and repair block allocation map File system is clean.
root [myaixLPAR] /tmp: mount /dd_backup Replaying log for /dev/ddbkup1lv. Fatal: I/O error mount: /dev/ddbkup1lv on /dd_backup: Unformatted or incompatible media
It is due to jfs2log is corrupted. Run a logform on the jfs2log.
logform /dev/loglv01 Answer "y" to confirm.
Now the filesytem can be mounted.