[root@vf20rs0626 ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1       4.9G  3.5G  1.4G  72% /
devtmpfs        992M     0  992M   0% /dev
tmpfs          1002M   76K 1002M   1% /dev/shm
tmpfs          1002M  664K 1001M   1% /run
tmpfs          1002M     0 1002M   0% /sys/fs/cgroup

[root@vf20rs0626 ~]# fsck -n /dev/vda1
fsck from util-linux 2.24.2
e2fsck 1.42.8 (20-Jun-2013)
Warning!  /dev/vda1 is mounted.
Warning: skipping journal recovery because doing a read-only filesystem check.
_/ contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Inodes that were part of a corrupted orphan linked list found.  Fix? no

Inode 48960 was part of the orphaned inode list.  IGNORED.
Inode 49001 was part of the orphaned inode list.  IGNORED.
Deleted inode 169173 has zero dtime.  Fix? no

Deleted inode 169225 has zero dtime.  Fix? no

Inode 169251 was part of the orphaned inode list.  IGNORED.
Inode 169260 was part of the orphaned inode list.  IGNORED.
Inode 169312 was part of the orphaned inode list.  IGNORED.
Inode 169315 was part of the orphaned inode list.  IGNORED.
Inode 169449 was part of the orphaned inode list.  IGNORED.
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences:  -(573457--573459) -(573464--573466) -(573470--573472) -573490 -(637977--637979) -(637982--637984) -(637986--637988) -(637995--637997) -638004
Fix? no

Free blocks count wrong (366582, counted=366583).
Fix? no

Inode bitmap differences:  -48960 -49001 -169173 -169225 -169251 -169260 -169312 -169315 -169449
Fix? no

Free inodes count wrong (191982, counted=191961).
Fix? no


_/: ********** WARNING: Filesystem still has errors **********

_/: 120978/312960 files (0.1% non-contiguous), 943883/1310465 blocks