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If you've ever had another controller online with the cinder-volume service running, you would end up with an entry for it in the list. This would be the case if you're running pacemaker to manage them, changed the host name of your controller, reinstalled the controller but kept the existing databases, etc.

You can see they are both for the same storage backend "rbd:volumes@rbd" but one of them is down. At this point it's probably just a cosmetic thing and not causing any harm.