Mastering Proxmox - Third Edition

Fencing

Fencing is a concept of isolating a node or its resources during node failure so that other nodes cannot access the same resources, putting them at risk of data corruption. In Proxmox, fencing prevents multiple nodes from running on the same virtual machine or cluster-specific services. Fencing ensures data integrity during a node failure by preventing all nodes from running on the same virtual machine or cluster services at the same time.

As of Proxmox VE 5.0, a separate fencing device used to configure Proxmox HA is no longer required. Fencing now uses a hardware-based watchdog or a Linux softdog. A Linux softdog is a software version of a traditional watchdog. Most modern server BIOSes have the watchdog functionality, but it is ...