How do clustered systems diffe

Clustered systems are typically constructed by combining multiple computers into a single system to perform a computational task distributed across the cluster.Multiprocessor systems on the other hand could be a single physical entity comprising of multiple CPUs.A clustered system is less tightly coupled than a multiprocessor system.Clustered systems communicate using messages,while processors in a multiprocessor system could communicate using shared memory.In order for two machines to provide a highly available service,the state on the two machines should be replicated and should be consistently updated.When one of the machines fail,the other could then take-over the functionality of the failed machine.