How to reduce FileSystem LVM in Redhat 6

Here are steps to reduce filesystem in Linux Redhat 6 (please do full backup before your execute reducing filesystem) :

1. Umount Filesystem
[root@RedHat6]# umount /oravl99

2. Fsck that filesystem.
[root@RedHat6]# e2fsck -f /dev/vg_arch/oravl99
e2fsck 1.41.12 (17-May-2010)
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
/dev/vg_arch/oravl99: 11/131072 files (0.0% non-contiguous), 16821/510976 blocks

3. Resize filesystem. example wanto to reduce 1G for existing filesystem
[root@RedHat6]# resize2fs -p /dev/vg_arch/oravl99 1G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/vg_arch/oravl99 to 262144 (4k) blocks.
Begin pass 3 (max = 16)
Scanning inode table          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/vg_arch/oravl99 is now 262144 blocks long.

4. reduce 1Gb on the filesystem
[root@RedHat6]# lvreduce -L 1Gb /dev/vg_arch/oravl99
  WARNING: Reducing active logical volume to 1.00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce oravl99? [y/n]: y
  Reducing logical volume oravl99 to 1.00 GiB
  Logical volume oravl99 successfully resized

5. Mount Filesystem
[root@RedHat6]# mount /oravl99

6. Check sizing current filesystem
[root@RedHat6]# df -h /oravl99
/dev/mapper/vg_arch-oravl99
                     1008M   34M  924M   4% /oravl99
[root@RedHat6]#

7. done