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Draft Agenda for WG meeting, Friday 25 Feb,1400,160-1-009

Draft Agenda for WG meeting, Friday 25 Feb,1400,160-1-009. Review questions regarding computing model and resources ( first discussion on our answers) F Harris et al Information on GRID EU proposal F Harris

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Draft Agenda for WG meeting, Friday 25 Feb,1400,160-1-009

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  1. Draft Agenda for WG meeting, Friday 25 Feb,1400,160-1-009 • Review questions regarding computing model and resources ( first discussion on our answers) F Harris et al • Information on GRID EU proposal F Harris • Update on UK status for LHC computing planning T Bowcock • Update on other LHCb countries (Germany,France, Italy,.....) (country reps) • Summary of work needed by WG for the review (summary agreement) F Harris Tasks for developing LHCb Computer Model

  2. Tasks for LHCb Computing Model Review F Harris Tasks for developing LHCb Computer Model

  3. Computer Model WG • Country reps • Brazil P Colrain(CERN) • CERN J Harvey(CERN) • France A Tsaregorodtsev(Marseille) • Germany M Schmelling(MPI Heid) • Italy D Galli(Bologna) • Holland M Merk(NIKHEF) • Poland M Witek(Cracow) • Russia I Belyaev(ITEP) • Spain J Saborido(Santiago) • Switzerland P Bartalini(Lausanne) • UK A Halley(Glasgow) T Bowcock will also act on WG (MC Farm) • Computing group • J Harvey(resources),G Corti(Analysis),M Cattaneo(Reconstruction),M Frank(Databases etc.), F Ranjard(Simulation),T Cass(IT),F Harris(raw+L2/L3+countries) • + Anyone who is interested and prepared to help! F Harris Tasks for developing LHCb Computer Model

  4. Overview of Talk /Discussion • The questions from Computing Review • The LHCb data flow model and relationship to MONARC • A possible ‘tier’ model for LHCb( a la MONARC) • Spreadsheets for defining our requirements - design and responsibilities • A current view of a possible LHCb model - some key parameters • Urgent jobs for country representatives • SUMMARY of tasks and timescales F Harris Tasks for developing LHCb Computer Model

  5. The questions posed by the Panel • What is LHCb Model with respect to MONARC generic model? • Current thinking re regional centres distribution • LHCb plans vs. country plans - show consistency • LHCb and GRID proposals - how , if at all, are we involved • What are our requirements for storage, processing, communications from now to 2005+, and how will they be satisfied (distribution of tasks in centres)? • Resource planning from now to 2005+ • Mock data challenges and test-beds? • Magnetic Tapes vs. Disks (what is our thinking?…) F Harris Tasks for developing LHCb Computer Model

  6. Some MONARC terminology for Datasets • Datasets ESD (Event Summary Data) Output from reconstruction (~ 100 kbyte) cp. Mini-DST AOD (Analysis Object Data) Basic data for analysis -derived from ESD by Group Analysis cp. Micro-DST (~10 kByte) DFD(Derived Data) Something smaller than AOD! TAG Identify event by its physics signature (bits for physics channels or overall event characteristics (~1 kbyte) cp. Nano-DST F Harris Tasks for developing LHCb Computer Model

  7. L2/L3 Trigger Physics Generator DAQ system Group Analysis Physics Analysis Reconstruction Generator Data Detector Simulation Analysis Object Data(AOD) Group Analysis Tags Simulated Raw Data Calibration Data Calibration Data Raw Data Raw Data Event Summary Data (ESD) Event Tags Ntuples Event Tags Trigger Tags Event Tags Physics results LHCb Computing Logical Dataflow Model Monte Carlo Detector Analysis Cycle ESD Calibration System Analysis Workstation

  8. MONARC terminology for Tiers • TIER-0 CERN (acts also as TIER-1) Stores all master copies and does first reconstruction + all or part of re-reconstructions • TIER-1 large RC on national scale (20% of scale of CERN centre). Can do all functions (e.g. share in re-reconstruction). • TIER-2 Smaller RC. Essentially dedicated to analysis. • TIER-3 Institute workgroup servers (for analysis) • TIER-4 Desktop COMMENT TIER-0 and TIER-4 will definitely exist. Combinations of -1,-2,-3 are a matter of system design according to local constraints F Harris Tasks for developing LHCb Computer Model

  9. 2.5 Gbps 622 Mbps 155 mbps 155 mbps 622 Mbps Desktop The MONARC RC Topology CERN – Tier 0 IN2P3 RAL FNAL Tier 1 Uni n Lab a Tier2 Uni b Lab c   Department  F Harris Tasks for developing LHCb Computer Model MONARC report: http://home.cern.ch/~barone/monarc/RCArchitecture.html

  10. 2.5 Gbps 622 Mbps 155 mbps 155 mbps 622 Mbps Desktop More realistically - a Grid Topology CERN – Tier 0 IN2P3 DHL RAL FNAL Tier 1 Uni n Lab a Tier2 Uni b Lab c   Department  F Harris Tasks for developing LHCb Computer Model

  11. Tier Facilities • Collaboration centre • CPU farms • mass storage • Tier 1 centre • 20% of collaboration centre • CPU farms • mass storage • high speed WAN connection to CERN • Tier 2 centre • 20% of Tier 1 • CPU farms • no mass storage • medium speed WAN connection to CERN • HEP institute • local cpu and disk server • desktop machines F Harris Tasks for developing LHCb Computer Model

  12. Liverpool Oxford Imperial College MONARC scheme applied to LHCb ( a possible model) Collaboration Centre CERN Germany? Russia? 2.4 Gbps Tier 1 ITALY? IN2P3 Lyon DRAL UK 622 Mbps Tier 2/3 HEP institute Desktop F Harris Tasks for developing LHCb Computer Model

  13. Raw Data and L2/L3 (F Harris)

  14. Calibration.(M Cattaneo) F Harris Tasks for developing LHCb Computer Model

  15. Reconstruction (M Cattaneo) F Harris Tasks for developing LHCb Computer Model

  16. Group Analysis (G Corti et al) F Harris Tasks for developing LHCb Computer Model

  17. Physicist Analysis(G Corti et al) F Harris Tasks for developing LHCb Computer Model

  18. Urgent Jobs for Country representatives(please treat as a priority activity) • Read GRID proposal and discuss with country colleagues (where relevant contact country person signing e.g. France,Italy,CERN,Spain,NIKHEF,UK) • Find out in general what planning is going on in country for providing LHC computing facilities • Find out what current situation is for HEP computing in LHCb institutes and country • e.g. CPU,Storage, networking,s/w environment • Liaise with WG on general LHCb model and how their institutes fit in to distribution of resources. Also physics analysis inputs will be very welcome! F Harris Tasks for developing LHCb Computer Model

  19. Computing Model joblist (our presentation will be in period Mar 22-24) • Agree on logical dataflow model…complete soon. (John,Frank, Gloria et al) Mar 1 • Agree structure of corresponding spreadsheets ( inputs from all please) Feb 29 • Collect numbers and complete the tables (provide Basic Requirements) Mar 6 • Document additional use cases for simulation, calibration, reconstruction, re-reconstruction, analysis • input Marco, Gloria, Florence, …. Mar 10 (Frank, John,Themis+ Country reps) • Using MONARC template, identify LHCb’s distribution of centres Mar 1 • Describe how these resources are used today (simulation and testbeam) Mar 10 • Produce a baseline model for how this will evolve for real data by 2005 Mar 10 • Determine what data storage, communications and CPU resources will be needed in centres Mar 10 • Describe plans for use of test beds and MDC’s to validate model and provide intermediate services between now and 2005. (? Who …) ?? F Harris Tasks for developing LHCb Computer Model

  20. How will we work ?(exchange of information etc.) • WWW site under construction- details on Feb 28.. Will put all working docs + links to MONARC,GRID etc… (http://lhcb.cern.ch/computing/hoff-grid) • For those at CERN lots of working coffees • For those not at CERN will use WWW, Email (?maybe one video/phone conf) + hard chasing! F Harris Tasks for developing LHCb Computer Model

  21. Overview of EU GRID proposal • http://nicewww.cern.ch/~les/grid/welcome.html GRID home page • http://nicewww.cern.ch/~les/grid/reports.htm Draft proposal • ‘Outline of a proposal for a Data-intensive Computational GRID Testbed’ K Bos(NIKHEF),F Etienne(IN2P3),E Fernandez(IFAE,Spain),F Gagliardi,H Hoffmann,L Robertson(CERN),F Ruggieri,M Mazzucato(INFN),G Vesztergombi(Hungary),R Middleton(RAL,UK) • Aiming for formal submission by May 10 • Hoffmann et al have met with experiments. Result was that • Experiments asked for a response as to their attitude • Agreed that proposal, if it goes ahead, must have experiments included in management somehow • Project is to ‘develop and demonstrate an effective wide-area distributed computing fabric’. Needs resources - people and testbed. Development is essentially s/w(Middleware) and evaluation in testbeds and using GEANT European network • So please read and find out how it relates to country activities (money, people, planning etc…) F Harris Tasks for developing LHCb Computer Model

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