We have build windows file server and i wan to run iozone to test Disk I/O performance so what kind of test i should run and how do i know how much i/o i will get at X size of file? also what is record size or record lengh I came across many time this word while i was googling..
I am running following test right now but i don’t know how do i read stats and what that result meas.
iozone -R -r 1M -s 100m
random random bkwd record stride
KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fre
102400 1024 1438781 1833689 1647187 1731045 1770870 1881794 1933970 4323897 1973719 1954304 1743602 10781
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Answer
Well, IOzone benchmarks a file system by breaking up a file of a given size into records. These records are written (or read) in a different way, according to the given test, until the file size is reached.
For example, your command (iozone -R -r 1M -s 100m) asks IOzone to execute all its tests (e.g. read, re-read, write, re-write, etc) over a file of 100MB. Read/Write operations are split into records of 1MB. It means that 100 operations are done over records of 1MB to achieve the tests.
Have a look at the results. The first number is the size of the file. The second is the record length. Then, numbers correspond to the throughput recorded for the different tests. Some tests are done several time (e.g. read, write, etc). First time is done sequentially, second time is done by random location accessing.
The following document explains in details IOzone. Have a look at the description of the tests to understand their meanings.