also sprach Tom H <tomh0665@gmail.com> [2011.06.27.0851 +0200]:
> > Partitions do not have UUIDs. What you are seeing are the MD UUIDs
> > stored in the superblock of the sda1 device.
>
> I called them "mdadm UUIDs" rather than "MD UUIDs" but they definitely
> exist, are different from the "MD Array UUID", and, AFAIK, unused by
> the user tools.
I misunderstood you. Partitions do not have UUIDs, but you were
talking about individual array constituents — those do have UUIDs
that are separate from the array UUID.
# mdadm --examine /dev/sda2 | grep UUID
Array UUID : bfb705a9:69bfc685:92b80aa8:ff445936
Device UUID : ed7cb6d2:32f8dda4:bdd22f74:c4ef720b
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