[root@sns-oss4 ~]# e2fsck -n /dev/mpath/sns-ddn1-l3
e2fsck 1.42.3.wc1 (28-May-2012)
snsfs-OST0003 contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences:  -(639602688--639604480) -(639606784--639608831) -(639610880--639612927) -(639614976--639617023) -(639619072--639621119) -(639623168--639623971)
Fix? no

Free blocks count wrong for group #19519 (14336, counted=3547).
Fix? no

Free blocks count wrong (2687836218, counted=2687825429).
Fix? no


snsfs-OST0003: ********** WARNING: Filesystem still has errors **********

snsfs-OST0003: 148972/29868032 files (6.2% non-contiguous), 1135271878/3823108096 blocks
[root@sns-oss4 ~]# e2fsck /dev/mpath/sns-ddn1-l3
e2fsck 1.42.3.wc1 (28-May-2012)
snsfs-OST0003 contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences:  -(639602688--639604480) -(639606784--639608831) -(639610880--639612927) -(639614976--639617023) -(639619072--639621119) -(639623168--639623971)
Fix<y>? yes

snsfs-OST0003: ***** FILE SYSTEM WAS MODIFIED *****
snsfs-OST0003: 148972/29868032 files (6.2% non-contiguous), 1135271878/3823108096 blocks