9 th November 2005David Foster CERN IT-CS 1 LHCC Review WAN Status David Foster Networks and Communications Systems Group Leader

9 th November 2005David Foster CERN IT-CS 2 WAN Overview, Parties, Stakeholders Status of DANTE/GEANT Transatlantic Status/Plans Contents

9 th November 2005David Foster CERN IT-CS 3 WAN Overview Connectivity: –T0-T1 This has the “real-time” issue of needing to get the data out from CERN as fast as possible. Dedicated infrastructure. –T1-T1 Firm models for T1-T1 data flows yet to emerge. Can share T0-T1 infrastructure but some additional dedicated infrastructure is expected. –T1-T2 Some thoughts that requirements could be high, especially if a 200TB, Tier-2 cache refresh is done frequently. (2 full days at 10Gbit/sec) Mixture of general purpose shared IP networks and dedicated infrastructure. The WAN infrastructure is growing “organically” with a central architecture for T0-T1 being defined by the T0-T1 working group. –No central funding. –Many independent activities. –Creating the opportunity for a large connectivity capacity

9 th November 2005David Foster CERN IT-CS 4 T0-T1 Designed around the concept of an “optical private network”. Dedicated bandwidth (10Gbit to each T1) on top of which an IP network is built. –End-End path involves CERN, GEANT and NREN’s in some cases and dedicated links in others. –Should provide very high, reliable performance. –Provided by different entities in different ways: Individual initiatives (e.g. Renater DF to CERN) Funded programmes (e.g. DOE and USLHCNet) International projects (e.g GEANT)

9 th November 2005David Foster CERN IT-CS 5 T0-T1 Networking Group Progress We have had a number of meetings and agreed on an overall approach with many open questions. –Some results have been published –And we have a wiki site for gathering operational information. As we move more and more towards providing an production infrastructure needed for service challenges in 2006, agreements on operational details are being created. –Meeting in Seattle 14 th november

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9 th November 2005David Foster CERN IT-CS 11 CERN-US 2005 (Lambda Triangle)

9 th November 2005David Foster CERN IT-CS 12 GLIF MAP

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9 th November 2005David Foster CERN IT-CS 14 Tier-0 - Tier-1 Connectivity Tier1LocationNRENsStatus dedicated link ASCCTaipei, TaiwanASnet, SURFnet2.5Gbit to Netherlight, 1Gbit from Surfnet BNLUpton, NY, USAESnet, LHCnet10Gbit to NY Pop, ESNet providing last-mile to BNL CNAFBologna, ItalyGeant2, GARR10Gbit across Geant-2 Dec 2005 FNALBatavia, ILL, USAESnet, LHCnet10 Gb in production IN2P3Lyon, FranceRenater10Gbit via private dark fiber Dec 2005 GridKaKarlsruhe, GermanyGeant2, DFN10Gbit across Geant-2 Dec 2005 SARAAmsterdam, NLGeant2, SURFnet2x10Gbit, will be replaced by GEANT-2? NorduGridScandinaviaGeant2, Nordunet2006 PICBarcelona, SpainGeant2, RedIris2006 RALDidcot, UKGeant2, Ukerna10Gbit to Netherlight via UKLight. To be replaced by SJ5 and GN2 in 2006 TriumfVancouver, CanadaCanet, LHCnet10Gbit to Netherlight, transit to CERN via Surfnet. Will carry mixed traffic initially

9 th November 2005David Foster CERN IT-CS 15 Issues, Conclusions etc. The GEANT-2 cost model for the additional 10G “pipes” is not clear. It will be a full cost recovery, marginal cost model but the precise figures are unknown. Ballpark figures are reasonable. There are a number of circuits becoming available end 2005/early 2006 as GN2 starts production. Total capacity exceeds the stated requirement of 1.6GBytes/sec but it needs to, to enable “catch up” and provide “headroom”. The role of the GLIF community in providing additional connectivity (e.g. T1-T2) is not clear but is a very interesting resource. There are no major T0-T1 networking technical issues but the models for T1-T2 continue to evolve. A very large aggregate capacity will be available for LHC. The challenge will be to really utilise the networks as they come on-line.