The first method that comes to mind is to make a raw copy of each mirrored disk
to another disk attached to the same server. dd if=/dev/sda of=/dev/sdb will do
a raw dump from one drive to another. Assuming you copy to a drive of equal or
greater capacity, your partition structure, RAID superblock (including UUID),
and data should remain intact. mdadm should be able to run a disk pair made by
raw copies of the disks. I don't see a problem with identical UUID drives
living in the same machine, so long as the array isn't started. Obviously
copying a mounted block device is a bad idea, so I'd do it from a bootable CD
environment, etc.
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