Hi, I managed to install our 15th server with a fully qualified hostname. I rectified this after adding the disks to the cluster (17.2.6) by changing the hostname. 1) ceph orch host ls - returns the correct (shrot) hostnames 2) ceph orch ps - returns the correct (short) hostname for all demons 3) ceph health detail returns the following ( despite failing the mgr ) [root@cephp15 ~]# ceph health detail HEALTH_WARN 1 stray host(s) with 12 daemon(s) not managed by cephadm [WRN] CEPHADM_STRAY_HOST: 1 stray host(s) with 12 daemon(s) not managed by cephadm stray host cephp15.xxx.xxx.xxx has 12 stray daemons: ['osd.168', 'osd.169', 'osd.170', 'osd.171', 'osd.172', 'osd.173', 'osd.174', 'osd.175', 'osd.176', 'osd.177', 'osd.178', 'osd.179'] [root@cephp15 ~]# 4) ceph device ls - returns the incorrect fully qualified hostname ( despite rebooting the host ) 5) I've tried a "ceph host rescan", this does not appear to make any difference. Does anyone have any suggestions on how to resolve this in a non-destructive way? Thanks, Chris