Cluster Service Communications

The Cluster Services in each node of a cluster are in constant communication with each other. Communication in small clusters is fully connected. That is, all nodes are in direct communication with all other nodes. Intra-cluster communication uses RPC mechanisms to guarantee reliable, exactly once delivery of messages.

The Cluster Service exports an interface for administration of cluster resources, systems, and the cluster itself. Applications and administration tools, such as the Cluster Administrator, can call these interfaces using remote procedure calls whether they are running in the cluster or on an external system. The administration interface is broken down into several categories, each associated with a particular cluster component: systems, resources, and the cluster itself.