>
> > Sure, with RAID1 one can cheat by going degraded 1 -> degraded 5,
> > and the net result is a larger partition, but he's starting from a raw
> > partition ...
>
> What about lower end start-ups? Say, if I have one drive, and I
> just managed to get a second drive, so I'd like to start mirroring
> (RAID1). There doesn't seem to be any way to make a two disk
> mirrored bootable md0 without a third drive...is there?
>
Yes, that is what the degraded raid mode is for. In your example, you
would create a degraded raid1 (with just one disk), copy the files
from your original disk, restart the system with the new /dev/md0
replacing your original disk then hot add the original to the raid
set.
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