Stop using LVM. Use ZFS!

(ZFS might be described as the love child of lvm and btrfs, 'cept ZFS got there first)

( Very briefly: you hand ZFS a stack of disks (in mirrors or raidz groups, for redundancy) and it makes a zpool. Then you carve the pool into datasets as needed. Each dataset looks like an ordinary directory and takes only the space its files actually use, so you never guess partition sizes again. And each one can have its own compression, snapshot schedule, quota, encryption, and send/receive backups, etc etc etc. )

How often are you needing to change partition geometry after install, on a server?

LVM for a *nix sysadmin is cheat mode for managing storage.