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first of all you need 3 controller nodes in order to have ha. (in pacemaker is sort of a must! you need 3 servers to have quorum, and if you have 2 contollers if one node fail pacemaker does not make a failover!).

And about stopping the neutron agents, if netns show you some output it's probably because the ovs-cleanup script didnt ran.( i think there is a bug on that)