correct, didn't think properly when I wrote that. Logical volumes can be put into logical groups that could contain pools of hdd's that can be sees as one, can also move space around easier and have snapshots. I had errors when trying to write the new partition layout hence why I used a live CD. Probably could of looked into it more but didn't want to spend forever on it or mess up any partition data.
I see few issues above.LVM is not a filesystem. You don't need to shutdown VM to extend its disk size. You don't need to boot from any installer CD to resize partitions, you can do it from within live system with fdisk, although if you have some unusual partition layout you're probably better off doing it offline. You can also extend filesystem on a live system, no need for shutdown.