TVDSM:支持透明计算的虚拟磁盘存储模型  

TVDSM: Virtual Disk Storage Model for Transparent Computing

作　　者：王斌[1] 郝鹏飞 吴加跃 胡义香 WANG Bin;HAO Pengfei;WU Jiayue;HU Yixiang(School of Information Science and Engineering, Central South University, Changsha 410083, China)

机构地区：[1]中南大学信息科学与工程学院,长沙410083

出　　处：《计算机科学与探索》2018年第3期350-359,共10页Journal of Frontiers of Computer Science and Technology

基　　金：国际科技合作与交流专项;No.2013DFB10070;湖南省科技厅项目;No.2012GK4106~~

摘　　要：为了解决在透明计算环境下,现有虚拟磁盘镜像存储存在多用户虚拟磁盘数据冗余过度的问题,基于写时重定向(redirect-on-write,ROW)思想设计了一种树状虚拟磁盘存储模型(tree virtual disk storage model,TVDSM)。该模型将虚拟磁盘中数据资源按共享度划分成多个层级,不同终端用户共享位于上层的系统资源以及应用软件资源,只在底层存储自身改写的数据,从而减少了虚拟磁盘存储系统中的冗余数据。同时基于位图索引技术设计并实现了一种树状的虚拟磁盘存储结构,该结构不仅能够很好地支持虚拟磁盘存储模型,而且支持将写重定向和查询定位操作以不同粒度分开实现,使得系统能够在较小共享粒度下获得较高的数据查询效率。The existing virtual disk image storage models are not suitable for the data sharing of large number of users in transparent computing platform due to the excessive redundant data.To solve the shortcoming,this paper proposes a tree virtual disk storage model(TVDSM)based on ROW(redirect-on-write).In the TVDSM,the virtual disk data resources are divided into multiple layers according to sharing degree,and different end-users share system resources and application software resources which are located in the upper layers,the model only stores selfrewritten data,thus greatly reduces the redundant data in virtual disk storage system.Then,this paper designs and implements a linking virtual disk storage structure based on bitmap index technology.The structure can not only well support the virtual disk storage model presented in the paper,but also support ROW and query location operation to realize separately with different granularity,which enables the system to obtain higher query efficiency in a smaller sharing granularity.

关 键 词：透明计算 虚拟磁盘镜像 写时重定向(ROW) 位图索引 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]