A Novel Hierarchical Cache Consistence Mechanism for WAN

This paper presents a novel hierarchical cache consistence mechanism-HCMM. HCMM is specially designed for the large scale distributed file system in WAN and can well adapt to work in WAN. HCMM uses hierarchical method to manage the consistence of cache, and can minimize the overhead of network communication and cache management. This paper also sets up a theory model to analyze the performance of HCMM. The results of theory analysis prove that the performance of HCMM is better than conventional cache consistence mechanism.