APPLICATIONS: Computer & Information Sciences
Advanced Networking Infrastructure & Research
Bandwidth Challenge from the Low-Lands
BandwidthChallenge from the Low-Lands
The avalanche of data already being generated by and for new and future High Energy and Nuclear Physics (HENP) experiments demands new strategies for how the data is collected, shared, analyzed and presented. For example, the SLAC BaBar experiment and JLab are each already collecting over a TB/day, and BaBar expects to increase by a factor of two in the coming year. SLAC and Fermilab's CDF (Collider Detector at Fermilab) and D0 experiments have already gathered well over a petabyte of data, and the CERN Large Hadron Collider (LHC) experiment expects to collect over 10-million terabytes.
The strategies being adopted to analyze and store this unprecedented amount of data is the coordinated deployment of Grid technologies, such as those being developed for the Particle Physics Data Grid (PPDG) and the Grid Physics Network (GriPhyN). It is anticipated that these technologies will be deployed at hundreds of institutes that will be able to search out and analyze information from an interconnected worldwide grid of tens of thousands of computers and storage devices. This in turn will require the ability to sustain, over long periods, the transfer of large amounts of data among collaborating sites with relatively low latency.
This project is designed to demonstrate the current data-transfer capabilities to several sites worldwide that have high-performance links. In a sense, the iGrid 2002 site is acting like a HENP Tier 0 or Tier 1 site (an accelerator or major computation site) in distributing copies of raw data to multiple replica sites. The demonstration is over real live production networks with no efforts to manually limit other traffic. The results are displayed in real time. Researchers investigate/demonstrate issues regarding TCP implementations for high-bandwidth long-latency links, and create a repository of trace files of a few interesting flows. These traces, valuable to projects like DataTAG, help explain the behavior of transport protocols over various production networks.
Acknowledgment: This demonstration uses SURFnet/StarLight, Internet2, ESnet, JANET, GARR, Renater2, Japanese wide-area networks and the EU DataTAG link between CERN and StarLight. Work is sponsored by the USA Department of Energy (DoE) HENP program; USA DoE Mathematics and Information Computing Sciences (MICS) office; USA National Science Foundation; Particle Physics Data Grid; International Committee for Future Accelerators; and, the International Union of Pure and Applied Physics.
R. Les Cottrell