Comment 3 for bug 1311533

This bug is because of a recent change in heat volume provisioning calls shifted from nova to cinder in the patchset https://review.openstack.org/#/c/86638/

However, the problem is cinder APIs which are only exposed programmatically, do not work for actual attach-detach with nova server.

Cinder calls only update metadata, which is why cinder list is showing that volume was attached but nova does not confirms the same.