17.June 2003 Bernd Panzer-Steindel, CERN/IT 1

Resource requests and allocations forResource requests and allocations forthe CERN T0/T1 center in 2003 + 2004the CERN T0/T1 center in 2003 + 2004

(preliminary, v1.0)(preliminary, v1.0)

17.June 2003 Bernd Panzer-Steindel, CERN/IT 2

Changes since last evaluationChanges since last evaluation

ALICE DC shifted by 3 month into 2004

ATLAS DC shifted by one year to April 2004

Fine tuning of the CMS request

Resource request increase by LHCb ( GEANT 4)

17.June 2003 Bernd Panzer-Steindel, CERN/IT 3July 2003 Jan 2004 Dec 2004

17.June 2003 Bernd Panzer-Steindel, CERN/IT 4Dec 2004Jan 2004July 2003

17.June 2003 Bernd Panzer-Steindel, CERN/IT 5

Plan BPlan B to cope with resource over-allocation in Q2to cope with resource over-allocation in Q2 (a combination of one or two options is probably sufficient)(a combination of one or two options is probably sufficient)

spread the load per experiment over a longer time period

shift one or two data challenges in time, forward or backward by 2-3 month

reduction of non-LHC resources by 50 % == 150 KSI2000

add resources from the testbed, computing data challenge and LCG-x installations == 300 KSI2000

add the base-line resource per experiment == 50 KSI2000

17.June 2003 Bernd Panzer-Steindel, CERN/IT 6

Purchasing strategyPurchasing strategy

New tender for disk and cpu server is out fill the stores with enough equipment in October install 2004 equipment end December or beginning of January

Budget 2004 500 KSFr for new LHC CPU resources , 100 KSFr for replacement ~ 400 KSI2000

500 KSFr for new LHC disk resources , 100 KSFr for replacement ~ 40 TB

500 KSFr for non-LHC investments

Possible problemPossible problem

Decision is due on who pays for LHC tape storage in 2004estimated 600 KSFrIf IT has to pay : extra budget ? or to be deduced from the 1.2 million

17.June 2003 Bernd Panzer-Steindel, CERN/IT 7

Disk resourcesDisk resources

this years delivery very late installation has started this week

total resources per experiment CMS 12.1 TB, ATLAS 12.6 TB, ALICE 6.1 TB, LHCb 7.0 TB

some extra resources available through LCG prototype

upgrade of WACDR in July, move to at least one server per experiment, improved CASTOR – GRIDftp integration

re-discussion of the disk storage requirements for the experiments in the current COCOTIME round ~ 40 TB extra for 2004

17.June 2003 Bernd Panzer-Steindel, CERN/IT 8

QuestionsQuestions

Is the move from GEANT3 to GEANT4 causing the same resource changes for all 4 Experiments ?

There are two in-efficiencies not yet considered : Lxbatch cluster (LSF, IO wait, etc.) 0.8 ?? Experiment specific (crashing jobs, submission inefficiencies, etc.) 0.8 ??

Memory size of the simulation jobs ( > 200 MB ??)

17.June 2003 Bernd Panzer-Steindel, CERN/IT 9

SummarySummary

No need to buy anything still in 2003

Can cope with the physics DC’s in 2004 with a bit of ‘re-arrangements/adjustments’

More detailed discussions about disk space necessary