quicky : create / extend a fs on a redhat 5 with lvm

list volume groups :
#vgs
or
#vgdisplay

create a lv :
#lvcreate -L 10G -n lvname vgname

format the lv to ext3:
#mkfs.ext3 /dev/vgname/lvname

to create the fs, need to add the correct entry in /etc/fstab

list the lvm /fs :

#lvdisplay

extend lv :
#lvextend -L +54 /dev/vg01/lvol10 /dev/sdk3

extend fs :
#resize2fs /dev/vg01/lvol10