Requirements for HA setup
From Proxmox 4.0 and later, the High Availability feature has been completely redesigned from the ground up making it much simpler to configure and use. There are a few requirements that the environment must meet before configuring Proxmox HA. They are as follows:
Minimum three nodes
Shared storage
Fencing
Minimum three nodes
HA must be configured in a cluster with a minimum of three nodes because with three nodes or more, achieving a Quorum is possible. A Quorum is the minimum number of votes required for a Proxmox cluster operation. This minimum number is the total vote by a majority of the nodes. For example, in a cluster of three Proxmox nodes, a minimum vote of two Proxmox nodes is required to form a Quorum. Or, in a cluster with eight nodes, a minimum vote of five Proxmox nodes is required to form a Quorum. With just two nodes, the ratio of vote remains at 1:1, so no Quorum is possible.
Shared storage
During a node failure, VMs are moved to the next member node in...
