The paper discusses the requirements of high-availability that vendors are facing today in the telecommunication area, and some of the solutions that shall be considered to provide such highly reliable systems.
Through simulation, we compare multi-cluster redundancy models, namely, configurations of hot standby and load-sharing clusters using Ericsson’s TSP clusters as a basis. The TSP cluster simulator is extended to provide the necessary features. Then through examples of simulated processor crashes, cluster failures and reconfigurations we demonstrate some of the issues that need to be taken into account when such systems are designed and dimensioned for fault tolerance.