Understanding HA

HA is a combination of components and configurations that allows continuous operation of a computational environment. Basically, it means that even when unattended server hardware goes bad in a live environment, HA can manage the remaining servers on its own and keep a virtual environment running by automatically moving or migrating virtual machines from one node to another, while minimizing downtime as little as possible. It should be noted here that Proxmox HA does not provide zero downtime migration of VMs. When a node with VM goes down hard, for obvious reason the VM becomes fully inaccessible. What Proxmox HA does when that happens is, it automatically moves the VM configuration files to member nodes and starts. A properly configured HA should require very little actual user interaction during a hardware failure. Without HA in place, all nodes will require constant monitoring by a network manager in order to manually move virtual machines to healthy nodes when a node...