We are using glusterfs-fuse as our storage backend. It outperforms single NFS servers and scales better, we have looked into qemu-glusterfs native integration however its not quite ready for prime time deployments. The key is to have well balanced storage hardware and fast networks. For our storage we like to use few high performance cores attached to a DAS with some SSD caching. Then we scale out as needed and let glusterfs / network hardware balance out the performance. Opennebula actually makes it really easy to scale out as well with multiple system data stores. We don't necessarily have to add more bricks to gluster volumes, we just add more volumes and then create more system data stores for i/o load balancing.
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