自动精简配置技术中空间回收方法的研究  

Research on Method to Reclaim Storage in Thin-Provisioning Storage Systems

作　　者：韩朴杰[1] 康慕宁[1] 张晓[1] 

机构地区：[1]西北工业大学计算机学院,陕西西安710129

出　　处：《计算机与现代化》2012年第12期168-173,177,共7页Computer and Modernization

基　　金：国家自然科学基金重点资助项目(61033007);西北工业大学基础研究基金资助项目(JC20110227);国家产业创新基金资助项目(2011BAH04B05)

摘　　要：自动精简配置(Thin-Provisioning)技术通过按需分配存储资源,可有效提高存储利用率。然而,在应用释放申请的空间后,存储系统难以及时回收这些被释放的空间。为此,提出一种存储区域网络(SAN)环境下针对自动精简配置的空间回收方法:存储系统识别文件系统格式并监视其元数据IO;当检测到文件系统空间释放行为时,计算对应可回收的区域;在通过数据一致性分析之后,对其进行回收。针对NTFS文件系统的原型实验证明,该方法确实能够进行有效的空间回收,且对主机应用影响较小。Thin-Provisioning serves effectively to improve storage utilization in a storage system by allocating space on demand. Nevertheless, in the environment of Storage Area Network （SAN）, it is difficult to reclaim the storage released from applications on thin-provisioning storage devices. The paper presents a method to reclaim free space for most file system on a thin-provisianing storage device. The method includes recognizing the format of the file system, monitoring the modification to the metadata of the file system to determine unused storage and reclaiming the space after a test based on data consistency. The prototype experiments show that the method can indeed reclaim free space for NTFS effectively, and moreover, the impact on the business applications is greatly reduced.

关 键 词：自动精简配置 空间回收 存储区域网络 文件系统 元数据 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]