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If you need to reinstall an existing Proxmox server from the cluster, the following steps must be carried out:

1. Reinstall Proxmox on both HDDs and select ZFS with RAID1.

2. Install the HighPoint Raid Controller driver and the corresponding RAID management software (/root/hptnvme_g5_linux_src_v11.8.11_2024_12_05.bin, /root/RAID_Manage_Linux_v3.1.14_23_04_21.bin)

3. Restore a backup of the old server. Especially important are:
/etc/hostname
/etc/hosts
/etc/fstab
/etc/corosync/
/etc/pve/
/var/lib/pve-cluster/
/var/lib/pve-firewall/

4. Restart the server.

5. Execute the command
service corosync status
to check whether the service is running.

6. execute the command
pvecm updatecerts –force
to ensure SSH access.

7. execute the command
pvecm status
to check that everything is OK and that the server is in quorum.

8. connect via SSH to another server in the cluster. If you are asked whether you really want to connect: enter “yes”.

If the SSH connection can be established and the server is in the quorum, everything is OK.