Grid replication coherence protocol

Summary form only given. Here we present two efficient coherence protocols for data grid applications. The data intensive grid applications often adopt the replica strategy to solve the data access bottleneck. It is important to keep coherence among all replicas of a copy of large amount of data. The first strategy for coherence is called lazy copy coherence protocol and the second aggressive copy coherence. Meanwhile, we consider in which situation we should make a replica for a copy of large amount of data.