Using a backup server in a 2 node cluster for quorum

[Mr.Embedded]

Has there been any thought of allowing the backup server to join a cluster as a node for quorum purposes only? I currently have a 2 node lab and am using an RPI as an arbiter but I also have a Truenas server for backups in the mix for that cluster. I have thought about replacing with a Proxmox Backup server and had that idea. It would eliminate the RPI completely while still allowing testing of HA/replication type scenarios. It would just work out of the box. I didn't find any documentation about this and figured I would ask here.

Thoughts?

 

[Dunuin]

Has there been any thought of allowing the backup server to join a cluster as a node for quorum purposes only? I currently have a 2 node lab and am using an RPI as an arbiter but I also have a Truenas server for backups in the mix for that cluster. I have thought about replacing with a Proxmox Backup server and had that idea. It would eliminate the RPI completely while still allowing testing of HA/replication type scenarios. It would just work out of the box. I didn't find any documentation about this and figured I would ask here.

Thoughts?

qdevice: https://pve.proxmox.com/wiki/Cluster_Manager#_corosync_external_vote_support

And you don't even need a qdevice. PVE and PBS can be installed bare metal on the same server and run in parallel. That way you would get 3 PVE nodes. Keep in mind that you should test your backups regularily. You usually do that by restoring them to a PVE host using a different VMID, attach the virtual NIC to a isolated subnet, boot that guest and then check if everything is still working. Here it would be handy to have a PVE, that doesn't run any productive guests, on the same server as the PBS, so you could do a fast local restore.
https://pbs.proxmox.com/docs/installation.html#install-proxmox-backup-server-on-proxmox-ve

 

[Mr.Embedded]

I am using the qdevice method with the RPI.

Good to know this idea is sound. I think I'll start taking the steps to refactor my Trunas box to be a PVE+PBS solution. I'll need to verify some of the other workloads the Trunas server are portable before doing that. The other thing I could do is also run a K8s master node on that backup host. Great option if it works as expected.