Pseudo-active replication of objects in heterogeneous clusters

An approach to making distributed systems fault-tolerant is to replicate objects. The replicas have to be realized in different types of computers. In the active replication, the replicas are computed and communicated in the same synchronous way. The computation speed of the process depends on the slowest replica. We discuss a pseudo-active replication where events may not occur simultaneously, not in the same order, and may not occur in the replicas.