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

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.

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 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, …);

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 8 L1 3   L2/3 5.5     10 11

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 Tracking1.5     10 8 Digitisation1.5     10 7 Reconstruction1.5     10 7 Total15505   10 8

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 9 Tracking3     10 9 Digitisation3     10 8 Reconstruction3     10 9 Total

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     Tracking5.5     Digitisation5.5     Trigger L0/L15.5     Reconstruction1.5     10 8 Total16502   10 11

Computing for LHCb-Italy Domenico Galli and Umberto Marconi Total Requirements for LHCb Tier-1 Units Signal events a    Background events a -1 2    CPU for signalSI    CPU for background SI     10 4 CPU for analysis SI   10 4 RAWmc disc TB RAWmc tape TB ESDmc disc TB AOD disc TB TAG disc TB

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

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. Units CPU SI Disc TB Tape TB

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.

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.

Computing for LHCb-Italy Domenico Galli and Umberto Marconi Investment plan for LHCb-Italy Units CPU[k E ] Switch[k E ]126 Rack[k E ]10515 Hard disc[k E ] Tape[k E ] Tape driver[k E ]400 Total hardware[k E ] CPU number (integral)# Electric power[k E ] Housing[k E ] System administration staff[k E ] Total operating costs[k E ] Grand total[k E ]

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%