一种可扩展大型E-MAIL服务系统的研究与实现.doc

一种可扩展大型E-MAIL服务系统的研究与实现本课题得到国家863计划项目资助
陈明宇李国杰赵延波张晓霞
(中国科学院计算技术研究所北京 100080)
摘要大型e-mail服务系统的用户规模已经开始向千万级发展,从而对系统的可扩展性、可用性和可管理性都提出了新的挑战。本文提出了一种基于机群和分布式存储的层次型大型e-mail服务器系统结构。这种结构通过三级负载平衡机制实现了请求的均匀分配,并通过对各功能单元进行并行化较好地解决了系统扩展中的瓶颈问题,提高了系统的可用性。文中还介绍了这种结构在曙光2000-II超级服务器上的实现——FreeMail及性能测试。实验表明这种系统结构具有良好的性能和可扩展性。
关键词 e-mail,大型系统,机群,可扩展性,分布式存储,负载平衡
STUDY AND IMPLEMENTATION OF A SCALABLE LARGE-SCALE
E-MAIL SERVER SYSTEM
CHEN Ming-Yu, LI Guo-Jie, ZHAO Yan-Bo, ZHANG Xiao-Xia
(Institute puting Technology, Chinese Academy of Sciences, Beijing 100080)
Abstract The user capacity in a large-scale e-mail server system is going up to the level of ten million, challenging the system scalability, availability and manageability. In this article, a hierarchical large-scale e-mail server architecture based on cluster and distributed storage is presented. This architecture can distribute ing requests evenly through a three-level load balancing mechanism, and can solve the bottleneck problem when scale up through the parallelization of each functional unit. Finally, the implementation of this architecture on the Dawning 2000-II super server – FreeMail and the performance test are introduced. Test result shows this system has high throughput and scalability.

Key words e-mail, large-scale, cluster, scalability, distributed storage, load balance
1 引言
用户量的飞速增长,提供个人邮件服务的大型ISP/ICP已经需要同时支持几十万到上