Thanks for your advice. Got it working in ESXi 5.5. Data migrated over fine. Now I'm just having the internal debate of trusting my data without SMART. It's a little bit scarey. There are lots of non DSM posts about people losing their data using RDM. I have crashplan for backups, but a 6TB crashplan restore would not be fun. Think I'm going to go back to bare metal DSM. Really shouldn't play with ESX without VT-D.