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BaBar’s Plans for the Grid

BaBar’s Plans for the Grid. Chris Brew CCLRC Rutherford Appleton Laboratory. Aims and Problems. Aims Use LCG to produce significant numbers of MC events Allow uses to run real analysis transparently on Grid Resources Problems Software Data Databases. Software.

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BaBar’s Plans for the Grid

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  1. BaBar’s Plans for the Grid Chris Brew CCLRC Rutherford Appleton Laboratory

  2. Aims and Problems • Aims • Use LCG to produce significant numbers of MC events • Allow uses to run real analysis transparently on Grid Resources • Problems • Software • Data • Databases

  3. Software • LCG Software model much better for Babar than EDG • Should be able to copy software releases to NFS mounted experimental software areas • Started to define protocol for bootstrapping babar env

  4. Data • BaBar Has a new non-Objectivity Data model based on Root files • BaBar Jobs access data over homegrown xroot protocol (now being re-integrated into root) • BaBar Data registered in MySQL Bookkeeping Databases • Can we add xrootd protocol to SE? • Can we publish the info from out bbk DB into the RLS?

  5. Databases • BaBar’s Configuration and Conditions DB is still Objectivity though work is underway to replace this. • Until then we have two options: • Run only at BaBar sites where we can install an Objy Server • WAN access to centralised objy servers

  6. BaBar UK Hardware • BaBar UK has 7 farms (~500 CPUs) at UK Universites • Manchester has been converted to LCG whilst retaining access to local software • Still needs some work on making submission for local users easier

  7. BaBarUK Hardware Plans • Plan for roll-out of LCG on BaBar Farms • Upgrade Farms to RHEL/SL (3 Months) • Upgrade 1 Farm (Bristol) with LCG (1-3 Months – concurrent) • Upgrade all Farms with LCG using GridPP Frontend Machines (3 Months)

  8. Solutions • Four Projects: • MC Production on LCG • Analysis Submission Wrappers • BaBar Software installation • BaBar BBK DB and RLS integration

  9. MC Production on LCG • Have MC Production via BaBar framework + Globus to several UK Farms. Produced > 20 Million events • Experiences with that makes us think transfer to LCG will not be too hard for sites that already have BaBar Software • Initial tests of this have already started • Output of BaBar Software installation project will feed directly into this as we expand to non-BaBar Sites

  10. Analysis Software Submission • BaBar analysis software makes a number of assumptions about location and environment • Needs wrapper utility to bundle up users environment and reproduce it before running the job • James Wehner (Man) is working on this, taking the experiences from AliBaBar (GridPP1) and is producing a full LCG framework

  11. BaBar Software Installation • BaBar Software available at RAL and Man via AFS from previous local install • script in known location to set-up environment • Need Grid Jobs to: • Install basic BaBar Framework • Install software release • Remove Software release

  12. BaBar BBK DB and RLS integration • BaBar’s new data model and xrootd data servers should fit nicely into the Grid infarstructure • Possible work needed: • Integrating the RLS with the BaBar BBK DB • Adding the xrootd protocol to the SE • Not a small job! BaBar BBK has >100M entries and is expected to grow to >1 Billion by 2010 • Need input from wider BabarGrid Community • Until this is ready we need a workaround using published “Tags” to locate datasets

  13. Conclusions • BaBar (UK) is putting together a clear plan for exploiting LCG • This will be finalised at BaBarGrid workshop in Autumn/Winter • We have a plan for making our resources available to LCG and for making use of others

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