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RAC requirements

RAC requirements. D0RACE meeting March 2002. Location issues. Should follow more or less collaborators distribution Locations should be defined to avoid unnecessary network traffic overlap. Network Bandwidths.

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RAC requirements

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  1. RAC requirements D0RACE meeting March 2002 F.Filthaut/B.Thooris D0RACE meeting March 2002

  2. Location issues • Should follow more or less collaborators distribution • Locations should be defined to avoid unnecessary network traffic overlap F.Filthaut/B.Thooris D0RACE meeting March 2002

  3. Network Bandwidths • Stringent requirements needed for bandwidth to FNAL (as this is where the centers have to get much of their initial data from) • Sustained rate of 10 Mbyte/s bound to require at least 1Gbit/s line • High bandwidth to other RACs desirable ( fair amount of data have to be shipped between centers ) • High bandwidth to IACs also desirable ( for those institutes that want to be able to look at data “at home” ) Perhaps less urgent if IAC’s needs can also be served by processing at the RACs • But serving IACs may require even higher bandwidth than transfers from FNAL? F.Filthaut/B.Thooris D0RACE meeting March 2002

  4. Storage Cache Size • Sufficient storage place is needed to hold 10~20% of data permanently and must be expandable to accomodate data increase • 30TB (300TB) just for 10% of RunIIa (RunIIb) Raw data... • 10TB (100TB) for RunIIa (RunIIb) Thumbnail set • Compute required cache size based on Thumbnails and some fraction of raw/reco • Random access could be preferred, since Thumbnails will likely be often used • 400 TB ~ 100-200k$?? Or what about tape (& robot) costs? F.Filthaut/B.Thooris D0RACE meeting March 2002

  5. Computer Processing Infrastructure • RACs must have sufficient computing power to reprocess all its data within 4 to 6 weeks • RunIIa: 2·108 evts/1month at 10s/event: ~ 800 CPU’s • Don’t believe it’s realistic to expect the same turn-around for RIIb • CPU resources could be different for each RAC according to the number of IACs in the area • i.e. assume (part of) IAC processing done at RAC. This implies point (1) above only gives a lower limit? Otherwise reduce “user” access during this time? • Requests can also be done by other RACs (?) F.Filthaut/B.Thooris D0RACE meeting March 2002

  6. Support personnel • A relevant study must be done to estimate the support personnel in each RAC in order to : • manage the software distribution • provide the support for users • address security issues? • maintain hardware • RAC must have a mirror copy of CVS database for synchronize update between RAC and CAC • RAC must also keep the relevant copies of databases • if caching turns out not to work • RAC must act as a SAM service station to provide data and rootuples to IACs F.Filthaut/B.Thooris D0RACE meeting March 2002

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