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Pull-out shelf to hold keyboards and mice

SC02. The Grid Infrastructure.

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Pull-out shelf to hold keyboards and mice

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  1. SC02 The Grid Infrastructure The Particle Physics Data Grid and other scientific and commercial communities increasingly need cutting edge. high-performance, predictable, reliable and secure: networking, distributed data storage and computing services that are distributed world-wide. We also need to share the resources fairly Security The cooperation between the DoE Science Grid Certificate Authority (CA) and the European Data Grid (EDG) CAs enables trusting of each others’ security certificates This enables virtual organizations (VO) of US & European physicists to share Grid resources in a secure way Measurement is critical to the planning, trouble-shooting and optimizing of networks and for steering Grid applications. SLAC and Fermilab have been leading world-wide continuous end-to-end Internet performance monitoring since Jan 1995. Network Scavengers Multi GByte & Tbyte data transfers present network challenges. To minimize the impact on interactive users SLAC is testing the Internet 2 Qbone Scavenger Service (QBSS). QBSS allows use of otherwise unemployed bandwidth without affecting other traffic. To enable QBSS, packets are labeled. When congestion occurs the labeled packets are passed on at lower priority than other traffic. Round trip times Bulk throughput High throughput file copies can soak up all available bandwidth causing congestion & elongated response times for competing users The plot to the left shows the increase in RTT measured by Web100 as throughput is increased To the right is shown the effect of mixing QBSS, best effort & priority file copies in a 10Mbps bottleneck. Note how QBSS traffic backs off & recovers as other traffic is introduced & removed. At the same time the impact of the QBSS traffic on the higher priority’s traffic RTT is minimized. Real time plots of round trip time (RTT) from SC2002 to several regions of the world. RTT depends on distance, bandwidths & router delays Real time plots of throughput from SC2002 to leading HENP, Grid and network sites worldwide. Achievable throughput depends on bandwidth, congestion, well engineered & configured applications, file systems, drivers and operating systems etc. For more information on this project please ask for a copy of the InterACT magazine article. For more information on this project please ask for a copy of the IEEE magazine article. Pull-out shelf to hold keyboards and mice Cabinet with shelves for handouts

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