@ij not a recommended setup (and even not a setup you should use).
Use at least 3 servers for #Ceph with low latency and high bandwidth in between.
Also #Proxmox VE (especially the #Corosync component that cares about cluster communication) needs less than 5ms.
Your 3rd Node in a 2-Node Proxmox Cluster can be a qnetd-Device, you don't need a 3rd Server (but you need for Ceph).
If you're running an HA #cluster based on #drbd, #corosync and #pacemaker, you can now monitor it with #prometheus using the HA cluster exporter: https://github.com/ClusterLabs/ha_cluster_exporter #opensource #tw
#cluster #drbd #pacemaker #corosync #prometheus #opensource #tw