中文摘要：

云存储服务性能开发是云端数据技术的重要课题．提出了一种基于云存储服务的文件系统数据存储架构，描述了一个基于该架构的云存储文件系统（CSFS）设计及实现．通过利用免费邮件服务降低了开发和部署成本，通过数据与元数据分离管理、分布式存储、云端数据预取等技术提高了系统的高效性和可扩展性．测试结果表明：相关优化技术有效提高了系统的读写性能．

英文摘要：

The development of cloud storage service is one of the key elements to cloud data technology. New data storage architecture for cloud storage service based file systems was proposed. And the design and implementation of cloud storage-backed file system based on the architecture （CSFS） was described. The development and deployment costs are reduced by utilizing free email service. The efficiency and scalability are increased by separated management of metadata, data block, distributed storage and cloud data prefetching. Experiments show that the optimization method improves the read and write performance of the system effectively.