This short report describes our experiences using the Emulab network testbed at the University of Utah to test performance of the Armada framework for parallel I/O on computational grids.

Acknowledgements Many people have helped us find our way during the development of this thesis. Erich Schikuta, our supervisor, provided a motivating, enthusiastic, and critical atmosphere dur-ing our discussions. It was a great pleasure for us to conduct this thesis under his su-pervision. We also acknowledge Heinz and Kurt Stockinger who provided constructive comments. We would also like to thank everybody for providing us with feedback.