Oracle VM 3.1 active active configuration

Hi
I am implementing Oracle VM 3.1 (4 physical servers) in two data centers, we would like to make it active/active, two servers running in a site and other two servers in another site, we would like a single server pool for the 4 servers so VM Guests can be started in both sites.
I can see a problem with the storage (which ideally should be active/active), I think the only options I have is using storage based mirroring to mirror the LUN used by the Guests from one site to another or use a clustered NFS arrays. All 4 servers accessing the one storage arrays located in a site.
Any other options?
Thanks a lot for the help

May I ask what you're trying to accomplish?
What connectivity do you have between the two datacenters?
I don't know what type of replication or etc you're trying to use to mirror the data across data centers/ storage devices....but I don't know if it would work with the repos or not. I imagine it would depend on what tyoe of lag in data you'll have at the peak of your usage. I assume you want to do this for HA?

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