１.create lvm

vgscan -> run the command at first

create partition ->fdisk 0x8e for lvm

pvcreate

vgcreate vgname pvname1 pvname2 default physical extent size 4m

lvcreate -L size -n lvname vgname

mke2fs -j /dev/vgname/lvname ->ext3 filesystem

mkdir /data -> create mount point

mount /dev/vgmane/lvname /data

２.extend LVM

umount /data

e2fsadm -L +100M /dev/vgname/lvname

mount /dev/vgname/lvnae /data

3.extend vgroup

fdisk ->create partition

pvcreate

vgextend vgname pvname

4.delete vg&lv

umount /data

lvremove /dev/vgname/lvname

vgchange -a n vgname

vgremove vgname