[root@cruiser dev]# mount
/dev/mapper/vg_cruiser-lv_root on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sdc1 on /boot type ext4 (rw)
/dev/mapper/vg_cruiser-lv_home on /home type ext4 (rw)
/dev/mapper/vg_oradata1-lv_disk01 on /u01/app/oracle/oradata/disk01 type ext4 (rw)
/dev/mapper/vg_oradata2-lv_disk02 on /u01/app/oracle/oradata/disk02 type ext4 (rw)
/dev/mapper/vg_oradata3-lv_disk03 on /u01/app/oracle/oradata/disk03 type ext4 (rw)
/dev/mapper/vg_cruiser-lv_disk04 on /u02/disk04 type ext4 (rw)
shmfs on /dev/shm type tmpfs (rw,size=128g)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

mount

[root@cruiser dev]# du -h --max-depth=1
0       ./vg_oradata1
0       ./vg_oradata2
0       ./vg_oradata3
0       ./net
0       ./hugepages
0       ./vg_cruiser
0       ./disk
0       ./bsg
0       ./block
0       ./char
0       ./.mdadm
0       ./mapper
272K    ./.udev
0       ./pts
43G     ./shm
0       ./input
0       ./bus
0       ./raw
0       ./cpu

[root@cruiser /]# du --si --max-depth=1
...
46G     ./dev
...

[root@cruiser ~]# du -hs /*
2.4M    /1.log
9.3M    /bin
44M     /boot
4.0K    /cgroup
43G     /dev
37M     /etc
1.7M    /home
145M    /lib
30M     /lib64
4.0K    /media
0       /misc
4.0K    /mnt
0       /net
1.3M    /opt
du: cannot access `/proc/13327': No such file or directory
du: cannot access `/proc/13887/task/13887/fd/4': No such file or directory
du: cannot access `/proc/13887/task/13887/fdinfo/4': No such file or directory
du: cannot access `/proc/13887/fd/4': No such file or directory
du: cannot access `/proc/13887/fdinfo/4': No such file or directory
0       /proc
4.1M    /root
15M     /sbin
4.0K    /selinux
4.0K    /srv
0       /sys
104K    /tmp
397G    /u01
222G    /u02
3.4G    /usr
149M    /var

[root@cruiser ~]# tune2fs -l /dev/mapper/vg_cruiser-lv_root
tune2fs 1.41.12 (17-May-2010)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          9ca36e7e-14d8-41a6-8769-03fd82dabb0a
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              1281120
Block count:              5120000
Reserved block count:     256000
Free blocks:              344526
Free inodes:              1040756
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1022
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8160
Inode blocks per group:   510
Flex block group size:    16
Filesystem created:       Thu Aug 29 17:03:28 2013
Last mount time:          Fri Jun  6 11:35:48 2014
Last write time:          Fri Aug 30 07:42:07 2013
Mount count:              31
Maximum mount count:      -1
Last checked:             Thu Aug 29 17:03:28 2013
Check interval:           0 (<none>)
Lifetime writes:          547 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
First orphan inode:       141872
Default directory hash:   half_md4
Directory Hash Seed:      06503c76-f5f1-4dd6-8c2b-58579bfac5ae
Journal backup:           inode blocks