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LHCb Computing. Umberto Marconi. CERN-Russia JWCG, 10/03/2008. Computing Model. Data flow and distribution. Detector (40 MHz). @Tier-2. Simulation. Trigger (2 kHz). RAW. Reconstruction. rDST. Stripping. @Tier-1. DST, TAG. User Analysis. Root-tuple. LHCb Resource Planning. CPU. - PowerPoint PPT Presentation
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LHCb Computing Umberto Marconi CERN-Russia JWCG, 10/03/2008
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Page 1: LHCb Computing

LHCb Computing

Umberto Marconi

CERN-Russia JWCG, 10/03/2008

Page 2: LHCb Computing

2

ComputingModel

Page 3: LHCb Computing

3

Data flow and distribution

Reconstruction

Stripping

User Analysis

Trigger (2 kHz)

Detector (40 MHz)

RAW

rDST

DST, TAG

Root-tuple

@Tier-1

Simulation

@Tier-2

Page 4: LHCb Computing

4

LHCb Resource Planning.

MSi2k*year 2008Online Farm 0.36CERN T0 + T1 0.36Tier1s 1.77Tier2s 4.55Total 7.04

11.38 11.3818.30 20.65

1.05 1.534.97 6.84

0.90 0.9020102009 2011

0.902.028.8011.3823.09

20120.902.379.93

11.3824.57

Disk (TB) 2008Online Farm 0CERN T0 + T1 350Tier1s 1025Tier2s 9Total 1385

12783250

20090

2759991

233773 455123

20100

20110

1565374123

5329

20120

1852423223

6107

Tape (TB) 2008Online FarmCERN T0 + T1 631Tier1s 860Tier2sTotal 1491

8534

15105

2012

62958810

20440

11906

20112009 2010

5340 10072

2270 42073070 5864

CPU

Disk

Tape

Page 5: LHCb Computing

5

Pledged Tier-1s 2Q2008 resources. Tier-1s capacity and requirements for 2Q2008: Pledges are

those from 1st April 2008. https://twiki.cern.ch/twiki/pub/LCG/SC4ExperimentPlans/Tier_1_Capacity_Available_and_Required_2Q2008.xls

Shortage of disk space availability at Tier-1s.

CPU(kSi2k)

Disk/Allocated(TB)

Tape(TB)

1770 1025 500

860

Page 6: LHCb Computing

6

Pledged Tier-2s.

http://lcg.web.cern.ch/lcg/planning/phase2_resources/P2PRCcaps181207.pdf

Summary of Tier-2s

Page 7: LHCb Computing

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Russian Tier-2 Federation

Page 8: LHCb Computing

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DC’06

104 concurrent jobs running on LCG

DC06 starts : June ‘06

During DC06 80% of the LHCbwhole production

RAW collected at CERN and distributed to the Tier-1s

emulating real data taking for reconstruction

and stripping at sites

Page 9: LHCb Computing

9

Distributed Analysis GANGA is the UI used to submit the analysis job

to the Grid. Use of the generic agents also with the analysis

job, downloaded from the DIRAC central queues.

Analysis job vs time

Page 10: LHCb Computing

10

CCRC’08 Aims

Test the full chain: from DAQ to Tier-0 to Tier-1’s. Test data transfer and data access running concurrently

(current tests have tested individual components). Test DB services at sites: conditions DB and LFC replicas. Tests in May will include the analysis component. Test the LHCb prioritisation approach to balance production

and analysis at the Tier-1 centres. Test sites response to “chaotic activity” going on in parallel

to the scheduled production activity.

Page 11: LHCb Computing

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CCRC’08 Planned Tasks RAW data distribution from the pit to the Tier-0 centre.

Use of rfcp into CASTOR from pit to the T1D0 storage class. RAW data distribution from the Tier-0 to the Tier-1 centres.

Use of FTS. Storage class T1D0. Reconstruction of the RAW data at CERN and at the Tier-1s

for the production of rDST data. Use of SRM 2.2. Storage class T1D0

Stripping of data at CERN and at T1 centres. Input data: RAW and rDST on T1D0. Output data: DST on T1D1 Use SRM 2.2.

Distribution of DST data to all other centres Use of FTS - T0D1 (except CERN T1D1)

Page 12: LHCb Computing

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CCRC’08 Planned Tasks (II) Preparation of RAW data will occur over the next few month

We need to merge existing MC datasets into ~2GB files February activities:

Maintain the equivalent of 2 weeks data taking. May activities:

Maintain equivalent of 1 month data taking. Run fake analysis activity in parallel to production type

activities using generic agents. Generic agents are the LHCb baseline. It needs to be integral

part of CCRC’08.

Page 13: LHCb Computing

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CCRC’08 Status Report LHCb report to LCG MB by Philippe Charpentier

http://indico.cern.ch/conferenceDisplay.py?confId=27472

Resources at Tier-1


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