You will need to inject RAID drivers at an appropriate time if you want to use RAID; Vail isn't going to have drivers for every possible hardware configuration "in box". You will also probably need to do this if you ever have to reinstall, or if you need
to restore a complete server backup to bare metal.
Better, in my opinion, is to break the array and let Windows Home Server have them individually.
I'm not on the WHS team, I just post a lot. :)