I've done quite a bit with IOzone, but if you're on Linux, you have lots of options. In particular, you can actually capture I/O patterns from a running application with blktrace, and then replay them with btrecord / btreplay.
The documentation for this stuff is a bit hard to find. Some of the distros don't install it by default. But have a look at http://ow.ly/2zyW for some "Getting Started" info. -- M. Edward (Ed) Borasky http://www.linkedin.com/in/edborasky I've never met a happy clam. In fact, most of them were pretty steamed.
