Scalable Topology
Scalable topology offers configuration flexibility, which enables it to be used for shared disk databases or HA services. Because of this flexibility, an extra configuration step is required for cluster membership and failure fencing.
For example, if node A starts a scalable cluster, the first function performed during cluster formation is for node A to telnet to an unused port (node lock) on the terminal concentrator (the port number is determined at installation). Node A will retain the node lock unless it leaves the cluster. If node A leaves the cluster, the node lock is passed to another node in the partition. If node A is unable to acquire the node lock, it will not start the cluster (failure fencing Rule 2).
Failure fencing ...
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