title: What is the difference between ceph rbd and iscsi in the context of Cinder volume (of type ceph)?
body: <p>I am trying to get a <a href="https://github.com/akailash/cinder-docker-driver" rel="nofollow noreferrer">volume driver</a> to work on a docker swarm which uses nova instances and cinder volume and makes persistent storage available for the swarm services. 
  I can only create cinder volumes of type ceph. I am modifying the driver and trying to get it to work for me, but I cannot get the TargetPortal, TargetIQN etc to do the <a href="https://github.com/akailash/cinder-docker-driver/blob/master/driver.go#L360" rel="nofollow noreferrer">iscsi attach</a>. Should I be using RBD instead of iscsi since the volume type is ceph?</p>