1. Computing for LHCb-Italy Domenico Galli and Umberto Marconi Dipartimento di Fisica and INFN Bologna Genève, july 5, 2000

2. Computing for LHCb-Italy Domenico Galli and Umberto Marconi Milestones On June 15, the LHCb-Italy computing plan was presented to INFN “Commissione I”. On July 4, the LHCb-Italy detailed request was submitted to INFN referees. On September 7, we will meet INFN referees. On September 15, the response of “Commissione I” for 2001 investments is expected.

3. Computing for LHCb-Italy Domenico Galli and Umberto Marconi Plans for Monte Carlo Production from 2001 to 2005 In 2001 we will produce ~2  10 8 simulated events for detector and trigger optimisation (detector TDRs expected in 2001 and early 2002); In 2002-2005 we will start to produce very large samples of simulated events, in particular background, for physics studies (2.4  10 6 evt in 2002, 7  10 6 in 2003, 1.5  10 7 in 2004, …);

4. Computing for LHCb-Italy Domenico Galli and Umberto Marconi Statistics needed for trigger optimisation Trigger SignalMinimum bias EventsCPU timeEventsCPU time #[SI95 s]# L0 1.5  10 6 5  10 9 3  10 5 4.5  10 8 L1 3  10 610 7  10 610 L2/3 5.5  10 6 2  10 10 2  10 8 3  10 11

5. Computing for LHCb-Italy Domenico Galli and Umberto Marconi CPU time needed for L0 trigger optimisation EventsCPU time/evtTotal CPU time #[Si95 s/evt][Si95 s] SignalM. B.SignalM. B. Generation1.5  10 7 3  10 5 2003  10 9 6  10 7 Tracking1.5  10 6 3  10 5 10001.5  10 9 3  10 8 Digitisation1.5  10 6 3  10 5 1001.5  10 8 3  10 7 Reconstruction1.5  10 6 3  10 5 2503.8  10 8 7.5  10 7 Total15505  10 9 4.5  10 8

6. Computing for LHCb-Italy Domenico Galli and Umberto Marconi CPU time needed for L1 trigger optimisation EventsCPU time/evtTotal CPU time #[Si95 s/evt][Si95 s] SignalM. B.SignalM. B. Generation3  10 7 7  10 6 2006  10 9 1.4  10 9 Tracking3  10 6 7  10 6 10003  10 9 7  10 9 Digitisation3  10 6 7  10 6 1003  10 8 7  10 8 Reconstruction3  10 6 7  10 6 2507.5  10 8 1.8  10 9 Total15501010

7. Computing for LHCb-Italy Domenico Galli and Umberto Marconi CPU time needed for L2 trigger optimisation EventsCPU time/evtTotal CPU time #[Si95 s/evt][Si95 s] SignalM. B.SignalM. B. Generation5.5  10 7 2  10 8 2001.1  10 10 4  10 10 Tracking5.5  10 6 2  10 8 10005.5  10 9 2  10 11 Digitisation5.5  10 6 2  10 8 1005.5  10 8 2  10 10 Trigger L0/L15.5  10 6 2  10 8 1005.5  10 8 2  10 10 Reconstruction1.5  10 6 5  10 5 2503.8  10 8 1.3  10 8 Total16502  10 10 3  10 11

8. Computing for LHCb-Italy Domenico Galli and Umberto Marconi Total Requirements for LHCb Tier-1 Units2001200220032004200520062007200820092010 Signal events a -1 10 7 1.2  10 6 3  10 6 5  10 6 10 7 Background events a -1 2  10 8 1.2  10 6 4  10 6 10 7 10 9 CPU for signalSI957001.15  10 4 3  10 4 5  10 4 10 5 CPU for background SI95108001.85  10 4 6.4  10 4 1.6  10 5 4  10 4 CPU for analysis SI950400075001.3  10 4 2.5  10 4 RAWmc disc TB0.50.81.43202 RAWmc tape TB0.50.81.4320240460680810101212 ESDmc disc TB0.250.40.71.5101 AOD disc TB0.1 0.30.550 TAG disc TB000.010.0152

9. Computing for LHCb-Italy Domenico Galli and Umberto Marconi Total Requirements for LHCb Tier-1 (II) SI95 TB

10. Computing for LHCb-Italy Domenico Galli and Umberto Marconi Incremental acquisition of Equipment for LHCb Tier-1 Resources splitted up among 5 regional centres. In steady state (starting from 2006) replacement every year of 30% of CPU and of 20% of disc. Units2001200220032004200520062007200820092010 CPU SI952300450013500242006050031500 Disc TB0.20.090.380.69111.222.4 Tape TB0.10.060.120.3239.840.4

11. Computing for LHCb-Italy Domenico Galli and Umberto Marconi The INFN Tier-1 for LHCb LHCb-Italy plans to concentrate the Tier-1 Regional Centre in only one site (differently from other Italian LHC groups), housed in a “consorzio di calcolo”, chosen based on economic convenience. Only one installation. Same architecture of other European Tier-1 centres. No problems concerning WAN usage (routing, data transfer optimisation to obviate bandwidth, etc.). No organisation and synchronisation requirements. Remote control of concentrated computing resources requires less bandwidth than geographically distributed data and CPUs. Transparent remote control of concentrated resources by institutes will be allowed by GRID middleware.

12. Computing for LHCb-Italy Domenico Galli and Umberto Marconi The INFN Tier-1 for LHCb (II) The “consorzio” is concerned with housing of computing resources: Links to electricity grid and computing network; Air conditioning; Uninterruptible power supply; Guardianship. To the “consorzio” we plan to outsource system administration: Participation to system installation; Administration and monitoring; Intervention in case of hang; Intervention for restoring LAN or WAN connectivity; Backup procedures; Operating system updating and patching.

13. Computing for LHCb-Italy Domenico Galli and Umberto Marconi Investment plan for LHCb-Italy Units200120022003 CPU[k E ]100122228 Switch[k E ]126 Rack[k E ]10515 Hard disc[k E ]5.51.23.9 Tape[k E ]0.110.030.04 Tape driver[k E ]400 Total hardware[k E ]132134259 CPU number (integral)#50111225 Electric power[k E ]112448 Housing[k E ]101528 System administration staff[k E ]305063 Total operating costs[k E ]5189129 Grand total[k E ]183223388

14. Computing for LHCb-Italy Domenico Galli and Umberto Marconi Computing group of LHCb-Italy SiteTest-bed HEP applications DATAGRIDTotal Maurizio BonesiniMI10%-- Walter BoniventoCA20%-- Domenico GalliBO40%-30%70% Alberto GianoliFE50%-- Giacomo GrazianiFI20% -40% Umberto MarconiBO40%-30%70% Marco PaganoniMI20%-- Giovanni PassalevaFI20%-- Roberta SantacesariaRM1-20%- Nicola Semprini CesariBO-30%- Vincenzo VagnoniBO30%20%-50% Stefania VecchiBO-40%- Total250%130%60%440%