In this paper, we consider the problem of calculating the reliability
of the replicated and-fork/and-join (RAFAJ) task graphs. An RAFAJ task
graph is generated from an AFAJ task graph with vertex and arc replic
ations. Due to the AFAJ constraint, the task graphs considered in our
problem are more general than those considered in the network reliabil
ity problem, which is an NP-complete problem for general task graphs.
In this paper, we propose an algorithm with time complexity O(n . 2(2r
)); where n is numbere of concurrent tasks, and r is the number of rep
lications.