High-availability clusters: A taxonomy, survey, and future directions

The delivery of key services in domains ranging from finance and manufacturing to healthcare transportation is underpinned by a rapidly growing number mission-critical enterprise applications. Ensuring the continuity these complex applications requires use software-managed infrastructures called high-availability clusters (HACs). HACs employ sophisticated techniques monitor health application layers resources they use, seamlessly restart or relocate components after failures. In this paper, we first describe manifold uses protect essential critical present architecture high availability clusters. We then propose taxonomy that covers all aspects -- deployment patterns, areas, types cluster, topology, cluster management, failure detection recovery, consistency integrity, data synchronisation; provide comprehensive survey end-to-end software solutions available for HAC Finally, discuss limitations challenges existing solutions, identify opportunities future research area.