[CentOS] CentOS 6.2 software raid 10 with LVM - Need help with degraded drive and only one MBR

Fri Mar 2 17:02:19 UTC 2012
John Doe <jdmls at yahoo.com>

From: Jonathan Vomacka <juvix88 at gmail.com>

> Essentially I guess the short question is, How do I make a non bootable 
> drive bootable if the original MBR is no longer available?

First, ask the guys at your datacenter what's the benefit of RAID if you have to reinstall from scratch after a drive failure...
Second, that's really bad luck that the one drive that failed out of the four was the one booting...
Now, I never had to do any recovery yet but, while you are waiting for some experts answers, I think it would look something like:
Boot in rescue mode.
Make a backup if you do not have one already.
chroot /mnt/sysimage/
# grub
grub> root (hd0,0)
grub> setup (hd0)
grub> quit
Good luck!  It is friday!