Clusterware is a term used to describe software that provides interfaces and services that enable and support a cluster.
Different cluster architectures require clusterware that delivers different services. For example, in a simple failover cluster, the clusterware may monitor the availability of applications and perform a failover operation if a cluster node becomes unavailable. In a load balancing cluster, different services are required to support workload concurrency and coordination.
Typically, clusterware includes capabilities that:
- •Allow the cluster to be managed as a single entity (not including OS requirements), if desired
- •Protect the integrity of the cluster so that data is protected and the cluster continues to function even if communication with a cluster node is severed
- •Maintain a registry of resources so that their location is known across the cluster and so that dependencies between resources is maintained
- •Deal with changes to the cluster such as node additions, removals, or failures • Provide a common view of resources such as network addresses and files in a file system
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