Extend current system with LVM

I always forget it because I don't do lvm resize everyday. Here is note for myself and anyone may need to do same thing.

1. Add a new disk/lun
2. Create a partition with fdisk (eg. create /dev/xvdb1 on /dev/xvdb)
3. pvcrate /dev/xvdb1 #create the physical volume
4. pvs #check physical volume is visible
5. vgextend VolGroup00 /dev/xvdb1 #add physical volume to volume group VolGroup00
6. vgs #check vgs has grow size and notice the free space (eg. VFree: 7.97G)
   
7. lvs #check which logical volume you want to grow
8. lvextend -L +7.96G /dev/VolGroup00/LogVol00 #grow LogVol00
9. resize2fs /dev/VolGroup00/LogVol00 #online resize (DO IT RIGHT TIME!)
10. Done. :-)