[Users] Confused about Gluster usage

Hi, I have been running oVirt 3.3.3 with a single node in a NFS type data center. Now, I would like to set up a second node. Both nodes have plenty of storage, but they're only connected to each other over 1 Gbit. I'm running nodes on CentOS 6.5. What I would like to accomplish is: * use a Gluster-backed DATA domain on my existing NFS datacenter * load balancing by even spread of VMs over the two nodes * leveraging the speed of local storage, so running a VM over NFS to the other node is undesireable So I was thinking I want the storage to be replicated, so that I can take a node down for maintenance without having to migrate all the storage to another node. I was thinking: GlusterFS. But I am confused on how to set it up. I understand I cannot use the libgfapi native integration due to dependency problems on CentOS. I have set up a replicated Gluster volume manually. How can I use my two nodes with this Gluster volume? What are the necessary steps? I did try a couple of things; most notably I was able to create a 2nd data center with POSIX storage, and mount the Gluster volume there, but that doesn't work for the first node. Alternatively, it would also be fine to migrate all existing VMs to the POSIX datacenter and then move the existing node from the old NFS data center to the new POSIX data center. Is that possible without exporting/importing all the VMs? Cheers, Martijn.