Create a Proxmox cluster / 4sysops

The Proxmox cluster provides a centralized interface for managing your data center’s processing, storage, networking, and other resources. Furthermore, it provides easier VM/container migration across nodes and high availability to ensure ongoing service in the event of cluster node failure. Cluster management in Proxmox VE is handled by the Proxmox VE cluster manager (pvecm).

Source: Create a Proxmox cluster