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软件学报  2010 

Efficient Disk I/O Characteristics Analysis Method Based on Virtual Machine Technology
一种基于虚拟机的高效磁盘I/O特征分析方法

Keywords: virtual machine,disk I/O characterization,performance optimization,on-line I/O analysis,file system
虚拟机
,磁盘I/O特征,性能优化,在线I/O分析,文件系统

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Abstract:

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.

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