Comment 1 for bug 1322190

Correct, this is by design at the moment. H/A (active/active or active/passive) volume manager has been talked about but not yet done.

There's a hack where you can force the host field of two volume-manager services to be the same and you sort of get H/A, but this is not a supported/recommended configuration. Google 'ceph cinder H/A' to find details on the hack, if memory serves