SERVER:/home/ruben# fsck -y /dev/md0
fsck 1.37 (21-Mar-2005)
e2fsck 1.37 (21-Mar-2005)
/dev/md0 is mounted.

WARNING!!!  Running e2fsck on a mounted filesystem may cause
SEVERE filesystem damage.

Do you really want to continue (y/n)? yes

Couldn't find ext2 superblock, trying backup blocks...
Superblock has a bad ext3 journal (inode 8).
Clear? yes

*** ext3 journal has been deleted - filesystem is now ext2 only ***

Superblock doesn't have has_journal flag, but has ext3 journal inode.
Clear? yes

/dev/md0 was not cleanly unmounted, check forced.
Pass 1: Checking inodes, blocks, and sizes
Root inode is not a directory.  Clear? yes

/dev/md0: e2fsck canceled.

/dev/md0: ***** FILE SYSTEM WAS MODIFIED *****