Sure, the first time it happens.
Then, two years later, a different drive fails. Bam.. no more boot.
Perhaps I'm misinterpreting what Bitt is trying to do. But if you've got "/boot" RAID1 on /dev/hd[ab]1, and "/" RAID5 on /dev/hd[abcdefgh]2, you are safe against any one drive failure (but no pair of drives). Once you replace the failed drive, you rebuild both RAIDs, make sure hda and hdb are both bootable, and you're back where you started where you can survive any one failure.
If it were my box I'd be tempted to put swap on /dev/hd[cdefgh]1.
Peter
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