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RAL Tier A

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  1. RAL Tier A Tim Adye Rutherford Appleton Laboratory BaBar UK Physics Meeting Queen Mary, University of London 25th October 2006 Tim Adye

  2. Outline • CPU Usage • CPU Allocations • Disk Status • The bleak future • Summary Tim Adye

  3. BaBar Batch CPU Use at RAL Tim Adye

  4. BaBar Batch Users at RAL(running at least one non-trivial job each week) Tim Adye

  5. CPU Allocations CPU Allocation (MAUI fairshare target) CPU Usage (MAUI fairshare usage) Tim Adye

  6. BaBar CPU Allocation and Usage Farm Capacity

  7. Requests and Allocations Tim Adye

  8. Data and Storage • Keeping up-to-date with new production • Uses disk space freed up by:- • Tau/QED skims removed in February • Converted R18b pointer skims to R18c deep-copy • Removed AllEvents in August • All old files still accessible from tape • Except old SP5/SP6 generics, now deleted from tape • Currently problems with user data disk • /stage/babar-user1 offline since 13 Oct • Recovering the data going slowly – hope to be done by the end of the week • Three 1.9 TB AWG disks • /stage/babar-awg1/Quasi2body (was TauQED) • /stage/babar-awg2/Quasi2body • /stage/babar-awg3/ThreeBody Tim Adye

  9. Three bullets we try to dodge • BaBar disk, tape, and CPU requirements increase with luminosity.No change in GridPP allocations Jan06 to Dec08. • PPGP cuts removed BaBar/RAL support staff • 1.5 FTE -> 0.25 FTE in April 2007 • No effort to import data, releases, help users, etc • identified 21 BaBar-specific tasks needed to keep Tier A running • GridPP proposal to remove non-Grid access by September 2007 • No RAL front-ends, no NFS access to user/AWG disks • Continued BaBar user analysis probably impossible • SP and/or skimming might still be possible via the Grid Tim Adye

  10. Summary • We are making good use of the resources we have • Apart from an (understandable) lull over the summer • The service works well most of the time • Current disk problem is severe, but rare • We are fighting hard for • the resources we need • the staff we need • the non-Grid access we need Tim Adye