Recovering from a network failure

The extent of network failure can span over multiple layers, causing interruption between the Proxmox node and the user, or between the storage node and Proxmox nodes. The failure can occur due to physical network interface failure or an accidental network cable pull from nodes. The network failure can also occur due to heavy network traffic, which may be caused by but not limited to running a backup task on the same network path. In most production environments, server nodes usually contain more than one network interface for redundancy to reduce the loss of network connectivity to a minimum. The three most common scenarios for network connectivity interruptions are explained in the following sections. 

Loss of connectivity between Proxmox nodes

In this scenario, network connectivity is only interrupted between Proxmox nodes in a cluster. When over half of the Proxmox nodes in a cluster cannot communicate with each other, a quorum cannot be established. If...