CMS TDR status and plans Claudio Grandi INFN

CMS TDR status and plans Claudio Grandi INFN - Bologna Claudio Grandi INFN Bologna Second LCG TDR meeting December 8 th, 2004

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 22 nd 2005 – together with LCG TDR Claudio Grandi INFN Bologna Second LCG TDR meeting December 8 th, 2004 2

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 Claudio Grandi INFN Bologna Second LCG TDR meeting December 8 th, 2004 3

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 prelocated 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 Claudio Grandi INFN Bologna Second LCG TDR meeting December 8 th, 2004 4

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 Claudio Grandi INFN Bologna Second LCG TDR meeting December 8 th, 2004 5

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 Qo. S – define costs in first year of LHC running – evaluate cost evolution in next years Claudio Grandi INFN Bologna Second LCG TDR meeting December 8 th, 2004 6

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 – L 1, L 2, milestones – resource loaded schedules for baseline implementations – change control mechanisms Claudio Grandi INFN Bologna Second LCG TDR meeting December 8 th, 2004 7

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 – L 1, L 2 milestones – resource loaded schedules for baseline implementations – change control mechanisms • final draft expected to be delivered for approval to CMS by end May 2004 Claudio Grandi INFN Bologna Second LCG TDR meeting December 8 th, 2004 8