STONITH: New externel/xen0-ha plugin to handle virtualized clusters.
author Lars Marowsky-Bree

# Instead of calling out to a physical STONITH device, the DomU cluster instead instructs the Dom0 cluster that it wants a specific node restarted or turned off.

# The Dom0 cluster knows - at all times, even with migration - on which physical node the DomU is currently hosted, and can comply with this request.

# Further, through this integration, Dom0 is made aware of the DomU intents, and its own monitoring and recovery strategy can take this into account.

# In case there is a DomU stop failure (due to a crashed hypervisor), split-brain or physical node failure, the Dom0 cluster can properly interact with the physical STONITH devices to faciliate recovery.

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If you use the Dom0 cluster to stop and start DomUs, the DomU nodes will cleanly sign-out of the DomU cluster and not trigger a fencing operation.