I have a raid-1 running under rhel6 (/dev/md0) that is mapped to /. It contains two unpartitioned disks (/dev/sda and /dev/sdb). I'd like to be able to boot from either disk. But grub won't let me do this, since it can't see a partition on either disk. I'm afraid I've rendered this system unbootable (and I don't want to reboot to find out). Any ideas on how to get out of this? I'm happy to break the raid to make that happen, if necessary.
To be more specific, running grub-install /dev/sd[a,b] leads to: Unknown partition table signature (this repeats 10 times) The file /boot/grub/stage1 not read correctly.
And running grub directly and then saying "root (hd0,0)" or "root (hd1,0)" leads to: Error 5: Partition table invalid or corrupt