Could be worth to say that the device which need to be added need to be "blank" of content. And particulary, that it need to not contain a "ceph osd". Because in this specific case. rook-ceph-osd-prepare job won't format it. Reported by: rhn-support-jpeyrard https://access.redhat.com/documentation/en-us/red_hat_openshift_data_foundation/4.9/html/replacing_devices/openshift_data_foundation_deployed_using_local_storage_devices#annotations:0951b67c-a093-4ac9-adce-f5a1463a0432