计算机科学 ›› 2016, Vol. 43 ›› Issue (Z11): 495-498.doi: 10.11896/j.issn.1002-137X.2016.11A.111
李锋,陆婷婷,郭建华
LI Feng, LU Ting-ting and GUO Jian-hua
摘要： 在云计算环境中,基础设施即服务的日益发展导致虚拟机和虚拟机镜像的急剧增加,例如,Amazon Elastic Compute Cloud(EC2)有6521个公共虚拟机镜像文件,这给云环境的管理带来了极大的挑战,特别是大量镜像文件带来的重复数据的空间存储问题。为解决这一问题,提出一种基于固定分块的镜像文件重复数据删除的存储方案。当存储一个镜像文件时,先计算该镜像文件的指纹,并与指纹库的指纹比较,若存在则用指针替代,否则采用固定分块对镜像文件分割存储。为此,可以设计镜像文件元数据格式和镜像文件MD5索引表来解决上述问题。实验结果表明,内容相同的镜像文件只是元数据的开销并实现秒传,而相同版本、相同系统、不同软件的镜像组的重删率约达到58%。因此,本方案是非常有效的。
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