Hello everyone,  Well i'd like to follow up on my own question. I ended up having to go to the Linux Kernel SCSI mailing list, where development occurs for such drivers as the MegaRAID.  Firstly, a quick note, VMWare ESXi, uses the MegaRAID drivers, exactly as does Linux in general, so the reason for one getting support before the other is beyond me. In any case I do have good news from the mailing list which I quote here:  
Hi there,  In September 2013 I bought a Dell VRTX + 3x M520 after having been sold the idea. What I hadn't at the time realized was that it did not support Linux which came as a shock because I had already purchased Red Hat Enterprise Virtualization subscriptions and these simply did not work because the Shared PERC 8 controller was not being detected meaning the shared storage was not available to the RHEV Hosts. As a temporary workarround, after having been told that Linux support would be available soon, I set-up VMWare ESXi on one host running a VM that shared the storage over to two other hosts running RHEV and under a supported method. This workarround has work thus far but at this point I am starting to wonder if Linux support will ever be added. I am now reverting to this forum to ask a simple a straightforwad question, when (if at all) will Linux support be added to the VRTX/M520 servers? Sincerely,
Dell PowerEdge VRTX / M520 - Linux support for Shared PERC 8 controller when?