HP Serviceguard manual No Arbitration-Multiple Media, Single Node Failure

Arbitration for Data Integrity in Serviceguard Clusters

To Arbitrate or Not to Arbitrate

	In Figure 2, on the other hand, a single node failure would result in the
	loss of heartbeat communication. In the no-arbitration model, the loss of
	heartbeat would be interpreted by the cluster manager as a failure of
	node 1, and therefore the cluster could re-form with packages failing over
	from node 1 to node 2.
Figure 2	Single Node Failure

No Arbitration—Multiple Media

It is possible to define multiple membership paths for intra-cluster communication that employ different types of communication from node to node. One path could use conventional LAN links, while a second path might employ a disk.

This model is illustrated in Figure 3. Both a LAN connection and a disk link provide redundant membership communication.

9