[ovirt-users] Trying to understand the mixed storage configuration options.

I'm fairly new to oVirt (coming from ProxMox) and trying to wrap my head around the mixed (local/NAS) data domain options that are available. I'm trying to configure a set of systems to have local storage, as their primary data storage domain, though also want to have the ability to have a NAS based data domain for guests that are 'mobile' between hosts. Currently I'm able to do one or the other, but not both (so it seems). When I put all of the systems in to a single cluster (or single data-center) I'm able to have the shared data domain, though have only found the ability to configure one system for local storage (not all of them). When I split them out in to separate data centers, they all have their local data domain working, but only a single dc is able to access the shared data domain at a time. Am I missing something along the way (probably fairly obvious) that does exactly what I'm outlining, or is this functionality not available by design? Any assistance/guidance is greatly appreciated.