1. LHC Computing Review Recommendations http://lhc-computing-review-public.web.cern.ch John Harvey CERN/EP March 28 th, 2001 7 th LHCb Software Week

2. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 2 Major conclusions and recommendations 1 mScale of resource requirements assessed and accepted mMulti-tier hierarchical model + Grid endorsed  Expected ~1/3 at CERN mNeed affordable research network @ 1.5 Gbps for each experiment by 2006 mJoint software efforts encouraged between experiments and IT mData challenges encouraged to test infrastructure and software mAreas of concern in software (support of simulation & analysis) mMissing manpower for Core Software teams, CERN/IT

3. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 3 Major conclusions and recommendations 2 mTotal hardware costs (240 MCHF, LHCb ~27 MCHF i.e. ~11%)  Investment spread over ’05, ’06, ’07 in approx. equal portions  M&O – rolling replacement every 3 years mJoint prototype reaching ~50% of 1 facility for ’03/’04 mLHC Software & Computing Steering Committee (SC2)+TAGs to oversee deployment of entire computing structure mMoU describing funding of and responsibility for hardware and software mInterim MoU to be signed prior to MoU (software, prototype)

4. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 4 Multi-Tier Hierarchical Model CERN Region I Region F Region UK Region D CERN Tier-0 Tier-1 (national) Institute Tier-2 (production) Institute Server Institute Server Institute Server Institute Server Tier-3 Desktop server Institute MAP..

5. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 5 Rates and Installed Capacities ALICEATLASCMSLHCbTotal Event size (MB)25210.125 Raw data/year (PB)2.78.11.70.2513.0 MC data/year (PB)0.21.51.20.363.3 Tape at CERN (TB)32008959154091214611 Disk at CERN (TB)53441011433302417 CPU at CERN (kSI95)8246908202252559 Tape worldwide (TB)47001980010500280037900 Disk worldwide (TB)160025705900110011070 CPU worldwide (kSI95)1758194429079257535 WAN Tier0/Tier1 (Mb)1500 3104810

6. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 6 Manpower (FTEs) for CORE Software 2000 Have (miss) 20012002200320042005 ALICE12(5)17.516.51717.516.5 ATLAS23(8)3635302829 CMS15(10)273133 LHCb14(5)2524232221 Total64(28)105.5106.5103100.599.5 CERN/IT - current staff complement 187 - minimum required to run centre 157 - predicted complement in 2006 137 Only computing professionals counted

7. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 7 Hardware costs of CERN Computing ’05-’07 Units kCHFALICEATLASCMSLHCb CPU1106910667126673479 Disk2188190753141535 Robotic Tape320094071617958 Shelf Tape001816214 Total Cost1807323692231357040 Costs spread over ’05 (30%) ’06 (30%) ’07 (40%) LHCb Tier-1’s 20152 kSFr (74%)

8. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 8 Joint Prototype mUse testbed to test at realistic scales:  Fabric management  Data Challenges with realistic rates  Scalability tests of CPU and I/O performance  New technologies - Copper gigabit; New tapes, IA-64  Data Grid functionality mLHCb Data Challenges  July '02 : Functional OO software  July '02 : DC 1 - 10 6 events in ~2 weeks  Dec '02 : Computing TDR  July '03 : DC 2 - 10 7 events in ~2 weeks (DataGrid milestone)  Dec '04 : Software Production Readiness Review  July '05 : DC3 - 10 7 events (full test of software & infrastructure)

9. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 9 CERN Testbed Plans 15060 40WAN links (Mbps) 10.5 0.25Tape I/O rate (GB/s) 5015 5 Disk I/O rate (GB/s) 1.00.4 0.2Tape capacity (PB) 18055 16Disk capacity (TB) 1’200500 (April 140) 200  300 Number of systems (dual CPU systems) 4Q. 024Q. 014Q. 00

10. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 10 Observations and conclusions mWaiting for response from CERN management  guidelines on construction and cost sharing of prototype  timescale for Computing TDR and MoU  allocation of additional new effort to IT and experiments  role and composition of SC2 and timescale for launch Data management project already in preparation mCommunication with funding agencies  Discussions at LHCC, RRBs - preparation of IMoU  Responsibilities for core software (sharing policy)  Advance notice of long term computing plan (cost sharing)  Policy of access to centres outside CERN mPreparation of distributed computing infrastructure  Development of analysis model – physics use-cases  Development of grid services – integration in GAUDI  Preparation of data challenges

11. LHC Computing Review Recommendations J. Harvey 7 th LHCb Software Week 28 March 2001 Slide 11 Projects mEvent Filter Farm (Computing)  Control and management of farm, installation, scalability  specialisation of GAUDI to filter farm environment mSoftware Framework (GAUDI)  Event model – development and optimisation  Detector description – development and optimisation of geometry  Scripting component to allow interactive analysis based on PYTHON  Grid services  Data management (event data, conditions data, bookkeeping) mPhysics frameworks  Simulation framework using GEANT4 – coordination  Analysis framework – coordination  High level trigger framework – coordination mTools/utilities  software and data quality monitoring  Documentation, workbooks m….