区域云跨地域节点间动态副本策略的研究

发布时间：2018-01-07 07:09

本文关键词：区域云跨地域节点间动态副本策略的研究　出处：《华南理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：云计算的兴起和迅速发展正在深刻的改变着人们使用互联网的方式。云的构成有各种方式，当云计算的规模不断扩大，成为跨地域的区域云的情况下，如何保证云数据高可靠、低延迟的访问成为云计算系统中一个重要的研究课题。采用分布式结构和副本技术是解决这一问题的思路之一。在大型分布式系统中，副本是提高系统冗余度，保障数据高可用性和提高数据访问效率的通用技术。而现有的云存储分布式文件系统中所采用的静态副本策略，对所有文件一视同仁，不能很好的适应多变的用户需求，如果直接用于跨地域的区域云，频繁的跨地域远程访问数据不但对地域间骨干网络造成压力，也严重影响了云服务的响应速度。本文针对区域云系统中跨地域分布的用户网，提出了区域云节点的概念及系统模型，并在此基础上提出了一种区域云跨地域节点间动态副本策略。该策略通过监控用户对数据的需求及相关参数对数据资源进行动态规划和调整，基于时间局限性定义文件远程请求热度、文件平均请求跨度的概念，，使得跨地域节点请求较多的热点数据能够动态的、快速的在区域云内扩散，让用户可以就近访问云服务的数据资源，从而减少对区域云跨地域节点间骨干网络的带宽消耗，提高数据访问的效率。本文对所提出的副本策略进行了仿真实验，仿真结果显示，该策略能够快速的增加文件副本数量，减少文件的跨地域节点的访问，提高系统的比特有效率，从而减少对区域云间网络带宽的消耗，并有效缩减平均文件访问时间。
[Abstract]:The rise and rapid development of cloud computing is profoundly changing the way people use the Internet. Cloud composition has various ways, when the scale of cloud computing continues to expand to cross-regional cloud. How to ensure high reliability and low delay access of cloud data has become an important research topic in cloud computing systems. Using distributed structure and replica technology is one of the ways to solve this problem. In large distributed system, replica is to improve the redundancy of the system. General technology to ensure high availability of data and improve the efficiency of data access. In the existing cloud storage distributed file system, static copy strategy is used, all files are treated equally. Can not adapt to the changing needs of users, if directly used in cross-regional regional cloud, frequent cross-regional remote access data not only to the backbone of the region network pressure. It also severely affects the response speed of cloud services. In this paper, the concept and system model of regional cloud nodes are proposed for the users of regional cloud systems with cross-geographical distribution. On this basis, a dynamic replica strategy between regional cloud nodes is proposed, which can dynamically program and adjust the data resources by monitoring the users' demand for data and related parameters. The concept of remote request heat and average request span of files based on the limitation of time makes the hot data which is requested by multi-region nodes can spread dynamically and quickly in the regional cloud. Users can access the data resources of the cloud service in the near way, thus reducing the bandwidth consumption of the backbone network between regional cloud nodes, and improving the efficiency of data access. The simulation results show that the strategy can increase the number of file replicas quickly, reduce the access of cross-regional nodes, and improve the system bit efficiency. Thus reducing the bandwidth consumption and reducing the average file access time.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP3

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