%0 Journal Article
%T Efficient Disk I/O Characteristics Analysis Method Based on Virtual Machine Technology<br>一种基于虚拟机的高效磁盘I/O特征分析方法
%A SHEN Yu-Liang
%A XU Lu
%A <br>沈玉良
%A 许鲁
%J 软件学报
%D 2010
%I 
%X Disk I/O may be the bottleneck in computer systems because of the mechanism characters in disk system. In order to tune the system performance effectively, the collection of the disk I/O workload characteristics will be the essential step for the performance optimization. Compared with other I/O characteristics collection methods, this paper presents an on-line I/O characteristics analysis method based on Xen 3.0 virtual machine system. In virtual machine environments, this method can be transparent to the unmodified operating system. With this method, several essential I/O characteristics metrics can be collected, such as disk I/O block size, I/O latency, I/O arrival interval, I/O spatial locality statistics, I/O time locality statistics and the I/O operation hotspot distribution. Through the testing and analysis, this method is found to have little system overhead and impact on the application system I/O performance. In addition, the I/O characteristics analysis results are demonstrated on the large file copy workload and the Filebench benchmark workload generated by the filemicro and varmail personalities.
%K virtual machine
%K disk I/O characterization
%K performance optimization
%K on-line I/O analysis
%K file system<br>虚拟机
%K 磁盘I/O特征
%K 性能优化
%K 在线I/O分析
%K 文件系统
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=7735F413D429542E610B3D6AC0D5EC59&aid=D1CF6F2750EA1E282C48872664EB684D&yid=140ECF96957D60B2&vid=659D3B06EBF534A7&iid=E158A972A605785F&sid=8AD9BBE1FAF6BB78&eid=D5B44BB3CCE27369&journal_id=1000-9825&journal_name=软件学报&referenced_num=0&reference_num=16