一种基于LVM和软件RAID5的文件存储改进方案  

An Improved Scheme of Server File Storage Based on LVMand Software RAID5

作　　者：林斌斌[1] 叶荣华[1] 

机构地区：[1]浙江师范大学数理与信息工程学院,浙江金华321004

出　　处：《计算机技术与发展》2015年第5期99-103,共5页Computer Technology and Development

基　　金：国家自然科学基金资助项目(61272007);浙江省自然科学基金(Y1110483)

摘　　要：存储虚拟化技术在方便服务器存储管理的同时存在一些弊端,将所有文件存于单个逻辑卷中可能会造成磁盘空间浪费或影响大文件的读写性能,将文件分类存储于多个逻辑卷会涉及存储空间的划分,由于逻辑卷不支持在线缩小文件系统,为某个逻辑卷分配过多空间亦会造成磁盘的浪费。针对上述情况,提出了一种基于LVM和软件RAID5的服务器文件存储改进方案,并设计了相应的算法。算法可对文件进行分类存储于多个逻辑卷,加入一个共享逻辑卷,若文件写入的逻辑卷满足约定使用率条件则将文件迁移至共享逻辑卷中创建或写入,避免过度预分配造成的浪费。对方案的实现进行了仿真实验,结果表明:分类存储可以提高大文件的读性能和存储利用率,方案在文件迁移情况下对小文件写操作的响应时间影响较小。Storage virtualization technology offers a convenient management for server storage,but there are also some drawbacks at the same time. When all files are stored in a single logical volume,it may cause the waste of disk space or affect the read and write perform-ance of large files. When the files are stored on multiple logical volume according to their types,a new problem can be the division of storage space,allocating too much space for a logical volume will result in a waste of disk space because logical volume doesn＆#39;t support shrinking file system online. For the above reasons,design an improved scheme for server storage and a corresponding algorithm for the scheme based on software RAID5 and LVM technology. The algorithm can classify files and make them stored in multiple logical vol-umes,a shared logical volume is added for the rest of the logical volumes,if the logical volume which a file is written to meets the ap-pointed usage rate threshold condition,the file will be moved to the shared logical volume to create or be written,avoiding the waste caused by excessive pre-allocation for a single logical volume. The experimental results show that classified storage for files can improve the reading performance of large files and utilization of storage,this program has a less effect to the response time of small file＆#39;s writing when the file is in migration situation.

关 键 词：软件RAID5 LVM 存储 算法 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]