On the live system, it is possible to create volumes that are backed by RBD images on the Demo Ceph Cluster. When a volume gets removed manually, the corresponding RBD image is deleted as well.
However, as soon as the live demo is refreshed, the new openATTIC instance is not aware of the previously created RBD images. So every time the live demo is refreshed after an RBD volume was created, it will remain in the RBD list of the Ceph cluster.
The Script that updates the live demo systems should also loop over all existing RBD images and delete them before the demo site is refreshed.