How to Extend LVM in Redhat 5.6

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http://unix.stackexchange.com – Hi I need to Extend the LVM on one Server And this is the df -h result Filesystem Size Used Avail Use% Mounted on /dev/cciss/c0d0p2 58G 26G 29G 48% / /dev/mapper/VolGroup00-LogVol00 476G 86G 366G 19% /u001/app/oracle /dev/cciss/c0d0p1 487M 17M 445M 4% /boot tmpfs 16G 730M 16G 5% /dev/shm And I need to Extend /dev/mapper/VolGroup00-LogVol00 fro 475G to700G. I have enough space to do this. Any suggestions. Please mention all steps and prerequisites (HowTos)