Dear OpenStack community, I have encountered a problem a few days ago and that is that when creating new volumes with: "openstack volume create --size 20 testmv" the volume creation status shows an error. If I go to the error log detail it indicates: "Schedule allocate volume: Could not find any available weighted backend". Indeed then I go to the cinder log and it indicates: "volume service is down - host: rbd:volumes@ceph-rbd”. I check with: "openstack volume service list” in which state are the services and I see that indeed this happens: | cinder-volume | rbd:volumes@ceph-rbd | nova | enabled | down | 2021-04-29T09:48:42.000000 | And stopped since 2021-04-29 ! I have checked Ceph (monitors,managers, osds. etc) and there are no problems with the Ceph BackEnd, everything is apparently working. This happened after an uncontrolled outage.So my question is how do I restart only cinder-volumes (I also have cinder-backup, cinder-scheduler but they are ok). Thank you very much in advance. Regards.