ceph proxmox 4.1 upgrade

Hello Status before upgrade: cluster of 7 server's running 3.4-11 with ceph hammer. status now: ceph - root@pm05:~# ceph -s cluster 2c01ea87-4de7-4941-9c0a-56b6dd14410a health HEALTH_WARN 42 pgs backfill 3 pgs backfill_toofull 18 pgs backfilling 1 pgs degraded 1 pgs stuck...

Hello, I plan to upgrade my Proxmox Cluster 3.4 to 4.1 and I need advice or upgrade the way that I've chosen will work. The current configuration: Proxmox 3.4 cluster with nodes 5 Node 1,2 and 3 are part of a cluster Proxmox but serve only as CEPH server (Proxmox configuration) are not for...