Decided it would be worth updating our Gluster storage to the newest version, it adds a few new features and bug fixes. This upgrade with simple and easy to do with no data loss
You can find the instructions here
Upgrading to Gluster 3.1 from 3.1.x
The upgrade consisted of having a newer CentOS kernel (if you're running CentOS). Geo-replication requires python-ctypes and newer version of rsync.
Upgrade steps are simple, download the rpm's, upgrade the installed packages and then you're on your way. If you built from source, then there are some additional steps, refer to the upgrade page.