Wide-Area Networking at SLAC
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Warren Matthews and Les Cottrell (SCS
Network Group) |
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Presented at SLAC, April 6 2001. |
Overview
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SLAC’s Connections to WANs |
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Utilization |
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End-to-end Performance |
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The Future |
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Note: LANs, MANs, SANs are not
discussed |
Why
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BaBar will have petabytes (millions of
GB) of data |
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Collaborators need access to SLAC
resources |
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Much will be exported for processing |
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WAN performance is critical to Modern
HENP |
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WAN Connections
Slide 5
Utilization of ESnet link
Slide 7
Slide 8
Utilization of Stanford Link
Slide 10
End-to-end Performance
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Large Data Transfer |
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Bandwidth, Congestion, Latency |
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Almost all interesting links cross
several networks |
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Peering is critical (avoid public
exchange points) |
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Some applications also sensitive to
variability in latency |
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IN2P3, Roma, RAL |
Performance Between SLAC and
IN2P3
Slide 13
Slide 14
Slide 15
Results and Future Plans
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Sustain 30Mbps* |
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CERN-IN2P3 link will be upgraded to
155Mbps this summer |
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Further upgraded to 622 Mbps by end of
2002. |
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CERNs Transatlantic link and PHYnet
will also be upgraded |
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Bottleneck will become connection to
Star Tap |
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Performance Between SLAC and
Roma
Slide 18
Slide 19
Results
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Measured 26Mbps sustained throughput |
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Dante upgrading network (Geant) |
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Multi-gigabit |
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Bottleneck is crossing New York |
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Notoriously difficult to get fiber
across NYC |
Performance Between SLAC and
RAL
Slide 22
Slide 23
Results
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40Mbps sustained |
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UKERNA is in the process of upgrading
to SuperJanet4 |
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Proposed OC12 dedicated path. |
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SLAC ESnet connection will be
bottleneck |
Summary
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Multiple high-speed connections |
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Optimize routing |
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Backup paths |
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Well Engineered Networks |
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Negligible packet loss, Good Round Trip
Times |
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Traffic doubled on ESnet every year
since 1990 |
Future Networks
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Tremendous infrastructure development |
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ESnet |
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Upgrade SLAC Connection to OC12 |
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Terabit (1000Gbps) backbone 2003-2005 |
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NTON |
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Connecting to Chicago, which will give
connection to CERN. |
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Star Light |
Conclusions
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Goals of HENP can be achieved |
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We have the technology |
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Known Goals |
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Continued Monitoring and Engineering |
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Feed Results back |
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Engineers |
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Users |
Further Information
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http://www-iepm.slac.stanford.edu |
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http://www.slac.stanford.edu/grp/scs/net/case/international |
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http://www.internet2.edu/arena |
Any Questions ?