Deploying hosted engine on a dirty LUN, where a master storage domain from another setup exists, succeeds. Verified with rhev 3.5.1 vt14
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2015-0910.html