Research On MOSIX Cluster File System

The efficiency of file accessing in cluster file system plays an important role in the performance of the cluster system. MOS1X load-balancing cluster system is an enhancement of Linux. Through the preemptive process migration it can balance loads variatins in the resoures usage among the nodes in the cluster. Direct File System Access, a provision that allowing a migrated process to directly access files in the current loaction, is supported by MOSIX through the MOSIX File System(MFS). To make DFSA work, A single-node consistency is required, and MFS can support the requirement by caching the only block data on the file server in the cluster system, but the traditional Linux cache mechanism on the file server can't provide enough buffer caches to both the local and the remote client processes. At the same time , there maybe have some nodes in the cluster with low load and their buffer caches aren't used efficiently. On the analysis of Linux virtual file system, cache models in cluster file system, MFS and the mechanism of DFSA, the Paper import the provesion of Cooperate Caching to MFS and put forward the mechanism of MOSIX Global Cooperate Caching(MGCC), which can make all the buffer caches in the cluster cooperate when the cluster is working and make these buffer caches utilize fully, so the overall performance of the MFS can be improved. And the paper also describe the MGCC can work with DFSA and memory ushing algorithm harmoniously.