[CentOS] Scheduler Elevator Deadline

In past on my machines with single drive or software RAID I have always had to change elevator to deadline. Mainly due to fact I was running email server with a great deal of I/O. Switching from CFQ to Deadline made a huge difference. I am wandering if with a hardware RAID controller should I still switch too Deadline or does the RAID controller do reordering etc. for me? Likely best answer is to try it. Doubt it would hurt anything to still switch too Deadline if I have plenty of CPU to spare. I am also trying to move all my servers to OpenVZ for hardware independence. When I need more disk space, CPU, etc. I just backup and move it. Perhaps there are gotchas there?

Thanks.