[CentOS] MIrrored drives won't boot after installation

> i had a similar problem with two scsi drives and ended
> up rebooting into rescue mode and installing and
> configuring lilo.  machine comes up with no problems
> at all now.  remember to run the lilo command after
> configuring.

i've seen this as well, but reinstalling grub from rescue mode fixed it as
well.  it seems to be some kind of problem with anaconda.  grub will work,
but just doesn't get installed properly at install time.