高性能磁盘阵列I/O服务时间的分析

ANALYSE OF I/O SERVICE TIME IN HIGH PERFORMANCE DISK ARRAY

在对常规策略的 I/ O服务时间进行分析的基础上 ,认为磁盘阵列系统中 ,当所有磁盘均进行 I/ O操作且只作一次时 ,系统的 I/ O服务时间最短 ,性能最佳 .为此提出了一种改进策略 ,这种策略通过对 I/ O子命令进行归并 ,对分块数据进行调整使磁盘只作一次 I/ O操作 .最后 ,在实时操作系统环境下测试了一组数据 ,并将测试结果进行了分析比较 .

We analyze the I/O service time of the general strategy, we think that we could get the best I /O service time and the best performance when all disks of the disk array system operate in parallel and work only once. So we bring out an improve strategy which combines the sub commands and adjusts the data, so that it is operated only once. Lastly, we test the two strategies in real time operating system, then we analyze and compare the test results.