The authors study the performance of a disk storing WWW data by using a broadcast polling model. The model has single message queues, an exponential server and asymmetric exponential arrivals. Numerical examples show that the analytical results are close to the simulation results.

A cache replacement policy which takes the transcoding time into account in making replacement decisions, for the emerging transcoding proxy servers is proposed. Simulation results show the proposed policy outperforms the conventional LRU in both the cache hit rate and the average object transcoding time.