Don't use VSA. It's hard to configure, easy to break, and all but requires you call support when it does. I would recommend VSAN. It's an object-based, object-RAID, storage "hypervisor." It can support WAY more nodes (hosts) than VSA, and it's extremely stable. It's still in beta, so you'll have to wait a little bit, but at the same time, I've yet to be able to crash it and not have it be more than a few minutes of reconfiguring.
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