The best is to do it by your self, by using different file sizes, like for example too many small files, and also files with a very large size, and you can find the statistics at:
STATUS -> hardware -> Function: Server statistics
There is a disk test tool that is provided that can be used. It does a quick read/write test.
Frankly, the best way to do all your testing is to boot to a live CD type OS and run your tests there.
I use a server running DRBL and boot my test systems into an Ubuntu image where I tools like xdd, bonnie, etc to test.