Cooperative Cache Management in S2FS

S2FS, a descendant of NCIC's COSMOS file system prototype, is a single-image cluster file system, and good scalability is its main design goal. Reducing client-server communication and the number of disk accesses is critical for I/O scalability. Cooperative caching reduces the number of network hops and disk accesses considerably, however, the network must be used to maintain cache coherence. This paper introduces the design of dual-granularity cooperative cache coherence, which is a new method to further reduce the server-end load and network communication. Experiments show that the dual-granularity approach can get a greater improvement compared to the traditional singlegranularity one. Keywords: S2FS, dual-granularity cache coherence, enhanced N-Chance algorithm 1 Introduction S2FS is a descendant of COSMOSüa prototype single-image cluster file system designed for NCIC's dawning superserver. One of its design goals is good scalability. Reducing client-server communication and the ..