Description of problem:
We've been testing cinder and nova volume encryption as detailed on the manual at https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux_OpenStack_Platform/6/html-single/Administration_Guide/index.html#volume_advanced_encrypt
But it was not working properly on NFS backend and no information is provided there.
After some investigation it has been found that there's ongoing discussion on this http://osdir.com/ml/openstack-dev/2015-11/msg01907.html.
Configure OSP cinder/nova encryption and validate as per http://docs.openstack.org/juno/config-reference/content/section_testing_encryption.html
If backend is NFS, the resulting data is visible, if it's dm volumes, it's encrypted
The data should be encrypted whatever the backend is
This will require some significant work in Nova and Cinder to support, see Dan Berrange's comment on bug 1305024.
Bulk update to reflect scope of Red Hat OpenStack Platform 9 and Red Hat OpenStack Platform does not include this issue (No pm_ack+).