Logical Volume:

--> To Create LVM partitions are using [8e]
--> Physical Volume Creation
--> pvcreate devicename1 devicename2..
Example:
# pvcreate /dev/hda10 /dev/hda11
# pvcreate /dev/sda10 /dev/sda11 [sata hard drive]

--> Volume group creation
--> vgcreate volumegroupname devicename1 devicename2
--> logical volume creation
# lvcreate -L size -n lv1 vg

To Create a file system:

mke2fs -j /dev/vg/lv1

mount /dev/vg/lv1 /data

/etc/fstab
--- /dev/vg/lv1 /data auto default 1 2


To extend a Logical Volume:

lvextend -L +200m /dev/vg/lv1
mount -0 remount /dev/vg/lv1

To reduce Logical Volume:

lvreduce -L -100m /dev/vg/lv1
mount -o remount /dev/vg/lv1


To Check:

ext2online /dev/vg/lv1 [in el4]

or
resize -t /dev/vg/lv1 [in el5]