常见硬盘IOPS参考值

Netapp建议使用的IOPS测试工具sio_ntap的使用方法

The command line options are expressed here (obtained by running sio with no command line options):

Usage: sio Read% Rand% Blk_Size File_Size Seconds Thread Filename [Filename]

where

• Read %: Percentage of accesses that are reads (versus writes)读操作占的百分比，若该值设置成50，表示读50%，写50%的读写混合测试。

• Rand %: Percentage of accesses that are random (vs sequential)随机读取占的百分比，若该值设置成30,表示随机测试30%，线性测试70%。

• Blk_Size: Size of I/O requests that are issued读写请求块的大小。

• FileSize: Size of area to be accessed in the file(s) (can be <= to actual file size; same for all files)截取测试目标文件的大小，该值不能大于Filename参数指定的文件的大小。

• Seconds: Run time (specified in seconds), minimum of 10 seconds (60 or more recommended)运行测试的时间

• Threads: Number of concurrent threads issuing I/O's 进行测试时使用到的CPU线程数，该数值越高，读写的延迟越低。

• Filename(s): One more files to target I/O at  测试用到的目标文件路径或者设备（如：/etc/dev1等）

参考链接：

http://elf8848.iteye.com/blog/1731301