Hi,
it all depends if you are going to configure a proper multi-site storevirtual configuration or you are simply splitting part of the machines at the two different sites. I'm saying this because SotreVirtual has its own logic in balancing LUNs, and is not sometimes they way you would expect… look at this blog post for mor informations:
http://vmfocus.com/2012/12/03/gotcha-vsphere-metro-storage-cluster-vmsc-hp-storevirtual/
I'm not aware if the new 10.5 firmware has solved this or has some new mechanism to manage this, need to check in my lab. I do not have a multi-site deploy at hand, sorry.
Luca.