Abstract
Replication is a technique commonly used to provide high-availability and fault tolerance in distributed systems. With multiple copies of the entities, a service can keep operation even when some copies are inaccessible because of a crash of the computer where a copy was stored, for instance. There are two main classes of replication techniques: passive and active replication. Passive replication suffers from a high reconfiguration cost in case of failure on the primary, and active replication has permanent processing redundancy.The hybrid replication technique presented in this paper has the same advantages of the passive replication in good runs, and has much less processing overhead than the active replication. In this paper, we demonstrate the efficiency of our replication model by the comparison among the response time (for the client) of the passive, active and hybrid replication scenarios using statistical analysis.Key wordsDistributed systemsreplicationstatistical analysishigh-availability
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