中文摘要：

随着网络上多媒体数据的爆炸性增长，对海量可扩展的存储系统的需求也快速增长．CMSS（Cluster Multimedia Storage System）项目采用分布式存储系统结构：一种自治的高性能的基于PC的存储集群系统．CMSS采用两级的元数据服务器结构，通过分离存储数据的逻辑视图与物理视图，全局逻辑视图由专用的全局元数据服务器来管理，局部逻辑视图和物理视图由各个存储服务器上的本地元数据服务器来管理．在详细介绍了CMSS系统两级元数据管理方案的同时，进行了相应的试验测试和性能分析．

英文摘要：

As a result of the multimedia rapid growth, demand for large-scale multimedia storage system is growing rapidly. The CMSS （Cluster Multimedia Storage System） project adopts decentralized storage systems-a self-managing high-performance PC-based cluster storage system. This paper describes the design and implementation of the Two-level metadata server for CMSS. The CMSS divides the logical view of the stored data from the physical view. The logical view is managed by the metadata server which is called GMS（Global Metadata Server）, and the physical view is managed by a component of storage servers which is called LMS（Local Metadata Server）. The paper introduced the design of the CMSS in detail, and perform a intensively performance evaluation study on the CMSS.