Pull-out shelf to hold keyboards and mice

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 prioritys 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