Yup, shared storage is a requirement. I’m using a combination of Ceph and NFS at the moment, but I wouldn’t recommend Ceph unless you’ve got a 10gb connection between nodes.

Here’s a guide to set up high availability with Proxmox: https://kiwicloud.ninja/2024/02/improved-high-availability-ha-for-vms-on-proxmox-ve-pve/