Mar 21 – 27, 2009
Europe/Prague timezone

Data transfer over the wide area network with a large round trip time

Mar 26, 2009, 8:00 AM


Prague Congress Centre 5. května 65, 140 00 Prague 4, Czech Republic
Board: Thursday 043
poster Grid Middleware and Networking Technologies Poster session


Dr Hiroyuki Matsunaga (ICEPP, University of Tokyo)


A Tier-2 regional center is running at the University of Tokyo in Japan. This center receives a large amount of data of the ATLAS experiment from the Tier-1 center in France. Although the link between the two centers has 10Gbps bandwidth, it is not a dedicated link but is shared with other traffic, and the round trip time is 280msec. It is not easy to exploit the available bandwidth for such a link, so-called long fat network. We performed data transfer tests by using gridftp in various combinations of the parameters, such as the number of parallel streams and the TCP window size. In addition, we have gained experience of the actual data transfer in our production system where the Disk Pool Manager (DPM) is used as the Storage Element and the data transfer is controlled by the File Transfer Service (FTS). We report results of the tests and the daily activity, and discuss the improvement of the data transfer throughput.
Presentation type (oral | poster) oral

Primary author

Dr Hiroyuki Matsunaga (ICEPP, University of Tokyo)


Prof. Hiroshi Sakamoto (ICEPP, University of Tokyo) Dr Ikuo Ueda (ICEPP, University of Tokyo) Dr Tadaaki Isobe (ICEPP, University of Tokyo) Prof. Tetsuro Mashimo (ICEPP, University of Tokyo)

Presentation materials