node cluster ceph upgrade

Hi guys, I will need your help, I am Patryk, during the past month I was working as Developer but as Hobby I was doing the sysAdmin/Hardware thing for our company. The main SysAdmin left the company, so it is now in my sholders... I was left alone, I think with not so good configuration...

Hello: I have a proxmox cluster 5.3-8, now I want to add a node, check the software information, the original node, ceph version is ceph: 12.2.11-pve1 New node version ceph: 12.2.13-pve1 ~ bpo9 Do I want to upgrade the Ceph version of the cluster to ceph: 12.2.13-pve1 ~ bpo9, please tell me how...

Hello all! I have a 3 node cluster on old 4.4 release, also its have a CEPH inside a cluster. Its not possible upgrade it step by step, with zero downtime. So i decided create new Proxmox server on 6 release, but it not compatible with old versions. First question - it is possible install...