Linux : How to chagne the block size of the logical volume

1) Check the block size of current device.
$tune2fs -l /dev/vg_oraarch/lv_oraarch |grep -i "Block size"

2) Unmount filesystem to change block size.
$ umount /u02/oraarch
3) Create filesystem to change new block size.
$ mkfs -t ext3 -b 4096 /dev/vg_oraarch/lv_oraarch 
4) Mount to check the changed block size.
$mount  /u02/oraarch
$tune2fs -l /dev/vg_oraarch/lv_oraarch |grep -i "Block size"