Yes, it is doable and easy. I’m the process of moving some old, legacy 2012 systems over to new 2012 R2 systems and one of the items was my SAS based Storage Space.

Basically the “only” thing I did was install the new Servers, turned the old server off, moved the SAS cables and opened the Server Manager, ad there it is (in read only mode of course). After setting in read-write mode, you can then easily “upgrade” (Note:You cannot downgrade…)

/mike