"Distributed real-time systems have continually being developed
for many real applications. It is very important to assure the reliability
of such systems. However, developing a fault-free distributed real-time
system is very difficult. Duplication is one of the fault-tolerant
technologies for improving the reliability of distributed real-time
computer systems. In this paper, we present a dual-cluster distributed
real-time system model with four states to improve the reliability of
distributed real-time systems. The system employs cluster switch,
output arbitration and fault detection to increase its reliability. The
system’s availability is evaluated according to the model. We also
introduce a dynamic approach for visualizing and debugging the timing
behavior of distributed real-time systems."
