Hi you all, it is a couple of days I'm facing this problem. Although I already destroyed the cluster a couple of times I continuously get these error I instruct ceph to place 3 daemons ceph orch apply mgr 3 --placement="cephstage01:10.20.20.81,cephstage02:10.20.20.82,cephstage03:10.20.20.83" but root@cephstage01:/# ceph -s cluster: id: 0827effc-302a-45a6-bb97-758d2a9e6835 health: HEALTH_ERR Failed to apply 6 service(s): alertmanager,grafana,mgr,mon,node-exporter,prometheus failed to probe daemons or devices 2 mgr modules have failed 1 mgr modules have recently crashed OSD count 0 < osd_pool_default_size 3 services: mon: 2 daemons, quorum cephstage01,cephstagedatanode01 (age 21m) mgr: cephstage01.ukwnlo(active, since 5h), standbys: cephstagedatanode01.vqbwbz osd: 0 root@cephstage01:/# ceph orch ls --service_name mgr --format yaml service_type: mgr service_name: mgr placement: hosts: - cephstage01:10.20.20.81 - cephstage02:10.20.20.82 - cephstage03:10.20.20.83 status: created: '2024-05-02T13:52:41.346547Z' last_refresh: '2024-05-02T14:06:31.823024Z' running: 2 size: 1 events: - 2024-05-02T13:51:49.993145Z service:mgr [INFO] "service was created" - '2024-05-02T13:53:45.566950Z service:mgr [ERROR] "Failed to apply: Cannot place <ServiceSpec for service_name=mgr> on cephstage02, cephstage03: Unknown hosts"' and when I check those hosts root@cephstage01:/# ceph cephadm check-host cephstage03 cephstage03 (None) ok docker (/usr/bin/docker) is present systemctl is present lvcreate is present Unit chrony.service is enabled and running Hostname "cephstage03" matches what is expected. Host looks OK they look fine. every time I recreate the cluster it gives me the same errors: does anybody have any idea? thanks in advance