Hi list, I had a quick question about Active-Active in cinder-volume and cinder-backup stable/stein and RBD driver, if anyone can help. Using only the Ceph RBD driver for volume backends, is it required to run A-A cinder services with clustering configuration so that they form a cluster? And, if so, is an external coordinator (redis/etcd/Consul) necessary, again only using RBD driver? Best docs I could find on this so far were; https://docs.openstack.org/cinder/latest/contributor/high_availability.html , I support more aimed at devs/contributoers than operators, but it's not 100% clear to me on these questions Thanks, Paul -- ******************* Paul Browne Research Computing Platforms University Information Services Roger Needham Building JJ Thompson Avenue University of Cambridge Cambridge United Kingdom E-Mail: pfb29@cam.ac.uk Tel: 0044-1223-746548 *******************