On Tue, 2020-05-26 at 05:42 +0800, Ed Greshko wrote:
> On 2020-05-26 00:24, Patrick O'Callaghan wrote:
> > I still ended up with /dev/md127p1 as before, and /dev/md0 wa's not
> > created.
> 
> I didn't think you would.  As I mentioned in another post, you didn't start 
> out with a "fresh" drive.  It already
> had info on it that mdadm had created and then just reused.  If you wanted to 
> do a really new set-up
> you would have had to done something like "dd if=/dev/zero of=" to both of 
> the physical drives.

Yes, I understand that. I still think the behaviour of mdadm in this
case is counter-intuitive. When I explicitly ask for the creation of an
array called /dev/md0 and the command first of all warns me that this
will (not "may") destroy the existing partition table and do I want to
proceed, then when I say yes apparently succeeds, I think I'm entitled
to think that /dev/md0 has been created, but it hasn't.

poc
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