DCFS2的元数据一致性策略

Metadata Consistency in DCFS2

随着集群应用对机群文件系统的性能、容量和规模等需求的日益增长,采用多元数据服务器是机群文件系统发展的必然趋势.基于多元数据服务器的分布式元数据处理是文件系统研究的一个重要问题.机群文件系统DCFS2采用分布式日志技术和改进的两阶段提交协议解决了分布式元数据处理下元数据的一致性问题.性能测试结果表明,DCFS2所采用的基于分布式日志的元数据处理策略能够提供高的IO性能,并能够保证在元数据服务器失效后文件系统快速恢复.

With the increase of required performance, capacity and scalability for a cluster file system, the multi-metadata-server structure is the trend for future cluster file systems. Distributed metadata processing based on multiple metadata servers is an important but difficult issue. In order to get high metadata performance and scalability, DCFS2, a cluster file system, uses distributed metadata processing over multiple metadata servers. Moreover, DCFS2 solved the metadata consistency problem for distributed metadata processing through a distributed logging technology and a simplified two-phase commit protocol. And performance results show that DCFS2's metadata processing policy based on distributed logging can deliver high I?O performance, and the file system can quickly recover from a metadata server failure.