Replication

Clustering also normally includes the replication of computation and/or data. Data replication involves moving the data from one node to one or more of the other nodes, as seen in the following diagram:

Data replicated from the left node in the cluster to all of the other nodes in the same cluster

Alternatively, data can be moved to a common storage from where others may reach it. This is, however, not considered to be true replication but shared storage. The result of replication is that no matter which node the communication is routed to, the integrity of the data is preserved at one or more locations.