we used raid 1 before on a 7.2 or 7.1 server, everynight it would crash to the point, it crashed so much, we had to rebuild the journel....boot partion...etc....Nick was a great help
Later on, we sold the machines, and another company that uses CPanel had told us when cpanel does its nightly check, it also checks out the raid configuration or something like that, and that was likely causing our crashes.
the machines we bought were from some company located there in Fremont, CA