Fencing is vital for Proxmox to manage a node loss and thus provide effective HA. Fencing is the mechanism used to prevent data incoherences between nodes in a cluster by ensuring that a node reported as "dead" is really down. If it is not, a reboot or power-off signal is sent to force it to go to a safe state and prevent multiple instances of the same virtual machine run concurrently on different nodes.
http://stormbp.blogspot.ru/2012/05/proxmox-ve-2-cluster-with-drbd.html
http://ru-sysadmins.livejournal.com/2222322.html
http://pve.proxmox.com/wiki/Two-Node_High_Availability_Cluster
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