Confused about SATA Raid

[Brent Wiese]

I installed FreeBSD 5.3 Beta 6 today on an Intel s875wp1-e server board. I
enabled RAID on the ICH5 SATA ports. Using its BIOS, I built a 2 drive
mirror.

FreeBSD saw both the native disks (ad4 and ad6). I installed to ad4.

I ran "atacontrol create RAID1 ad4 ad6". It said ar0 was created.

Now I'm stuck. How do I make the system use ar0 instead of adX? Can I simply
change the /etc/fstab file and reboot?

Thanks!
Brent