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I just had a disk failure of one of the members of my RAID-1 boot disk. Fortunately for me it turned out to be the non-boot disk (ie I had hda and hdc mirrored, and hdc was the one that died -- fortunately my recovery process worked), however it does raise a question:
If the disk that failed turned out to be the boot disk, how would I boot off of the survivor? ie if hda had died, how do I boot of hdc once I'd replaced the dead one?
I suspect the answer is "get a rescue CD", but if there are better answers I'd like to hear them.
Actually, what he wrote is very much what you need to do. You'll need to install grub to /dev/hdb in your case, or you could swap the location of the drive, from the secondary to the primary position. You should also rebuilt as detailed in this article, once you get the system back up with one good and one empty disk -