About cluster membership and data protection without I/O fencing

Proper seeding of the cluster and the use of low priority heartbeat cluster interconnect links are best practices with or without the use of I/O fencing. Best practice also recommends multiple cluster interconnect links between systems in the cluster. This allows GAB to differentiate between:

In order for this differentiation to have meaning, it is important to ensure the cluster interconnect links do not have a single point of failure, such as a network switch or Ethernet card.