On Wed, 2007-02-28 at 20:05 -0600, Les Mikesell wrote:
In any case it is a good idea to be prepared to boot the install CD in rescue mode and reinstall grub if it doesn't work quite the way you expect when one of the drives fails.
Or consider making a GRUB boot CD with the current kernel[s] that can both boot the system to a normal state if the boot record is corrupted, and allow you to fix the problem running the normal environment - rather than having to boot the rescue CD, chroot, fix the problem, reboot, test, and possibly lather, rinse, repeat.
See at the end this link for directions - ignoring the stuff about errors unless you have those issues also:
http://lists.centos.org/pipermail/centos/2007-January/073835.html
Phil