[Users] Gluster storage

Hello everybody, i'm successful using ovirt with 16 physical node, in a FC cluster with a very BIG dell compellent (and so expensive) enterprise storage ;) I'm researching a new architecture for a new cluster, and i want to understand more better the glusterFS integration in ovirt. As i understand you have to install a normal physical node, with also the glusterFS package… right ? after that you have to create a new cluster in ovirt , new datacenter and put in this new node. in that datacenter you can create a new data domain ( glusterFS ) that reside on that host. right ? and… after that ? ok i have 1 node that are also my " storage ", and if i want to all more compute node ? … every new compute node are a new " brick " for glusterFS so i can expand/redundant the first one ? i don't have the architecture very clear in my mind, and the documentation don't clarify the final architecture for this type of usage. Thanks for help guys Luke