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CMS TDR status and plans

This text discusses the status and plans for the CMS Computing Technical Design Report (TDR). It includes information on the computing model, data flow, event reconstruction, analysis model, middleware, computing infrastructure costs, and more. The TDR will be distributed for review in January 2005 and produced by June 2005.

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CMS TDR status and plans

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  1. CMS TDRstatus and plans Claudio Grandi INFN - Bologna Second LCG TDR meeting

  2. Path to CMS Computing TDR • Computing Model paper being reviewed now • Did work using the RTAG approach: • 2 months of intense work • Will be distributed to LHCC for the 17-19/1/2005 review • Computing TDR will be produced by June 22nd 2005 • together with LCG TDR Second LCG TDR meeting

  3. Computing Model paper (1/4) • Data, Processing and Analysis model • Event model • RAW, RECO, AOD, (Heavy Ion) • event rates, sizes of data-tiers • Event Data Flow • Online streams and Primary Datasets, Express Line • Data flow to Tier-1’s and Tier-2’s • Event reconstruction • First reconstruction at Tier-0 offline farm • Level of availability of RAW data • Monte Carlo • Number of events and sizes Second LCG TDR meeting

  4. Computing Model paper (2/4) • Analysis Model • skims and analysis event formats • Event Directories, TAG’s, etc... • Middleware • multiple grid implementation A fairly traditional computing model where data, and even to some extent physicists, are pre-located according to an experiment determined plan aimed at getting the physics right and out. • Simplifying the demands on grid tools (resource brokers, replica managers etc.,) during early running Second LCG TDR meeting

  5. Computing Model paper (3/4) • Computing Model specification • role of Tier-0/1/2 • network specification • CPU needs definition • data storage strategy - kind of event stores • disk buffers, disk permanent storage, active tape, archival tape • responsibilities for reconstruction and re-reconstruction • responsibilities for Monte Carlo production and storage • number of copies of data and custodial responsibility • Support to analysis • batch and interactive analysis, skims, data transfer to Tier-2’s Second LCG TDR meeting

  6. Computing Model paper (4/4) • Cost of computing infrastructure • size of computing infrastructure at each Tier-0/1/2/3 • CPU • disk storage • active tape storage • tape archival • network bandwidth and QoS • define costs in first year of LHC running • evaluate cost evolution in next years Second LCG TDR meeting

  7. CMS Computing TDR Will include: • Refined Computing Model • Non event data (conditions and calibration data) • Application software • Baseline plans for workload management, data management, book-keeping systems, etc… • specification of services • catalogues, information systems, etc… • specifications of technologies • Overall management plan for construction period • L1,L2, milestones • resource loaded schedules for baseline implementations • change control mechanisms Second LCG TDR meeting

  8. LCG TDR We expect it will cover: • specification of Tier-0 • specification of technologies • for services (middleware) • for resources • overall management plan for construction period • L1,L2 milestones • resource loaded schedules for baseline implementations • change control mechanisms • final draft expected to be delivered for approval to CMS by end May 2004 Second LCG TDR meeting

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