The All-in-One install I detailed in Up and Running with oVirt 3.3 includes everything you need to run virtual machines and get a feel for what oVirt can do, but the downside of the local storage domain type is that it limits you to that single All in One (AIO) node.
You can shift your AIO install to a shared storage configuration to invite additional nodes to the party, and oVirt has supported the usual shared storage suspects such as NFS and iSCSI since the beginning.
New in oVirt 3.3, however, is a storage domain type for GlusterFS that takes advantage of Gluster’s new libgfapi feature to boost performance compared to FUSE or NFS-based methods of accessing Gluster storage with oVirt.
With a GlusterFS data center in oVirt, you can distribute your storage resources right alongside your compute resources. As a new feature, GlusterFS domain support is rougher around the edges than more established parts of oVirt, but once you get it up and running, it’s worth the trouble.