12th September 2002Tim Adye1 RAL Tier A Tim Adye Rutherford Appleton Laboratory BaBar Collaboration Meeting Imperial College, London 12 th September 2002.

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Presentation transcript:

12th September 2002Tim Adye1 RAL Tier A Tim Adye Rutherford Appleton Laboratory BaBar Collaboration Meeting Imperial College, London 12 th September 2002

Tim Adye2 Hardware 104 noma-like machines allocated to BaBar 156+old farm shared with other experiments 6 BaBar Suns (4-6 CPUs each) 20 TB disk for BaBar Also using ~10 TB of pool disk for data transfers All disk servers on Gigabit ethernet Pretty good server performance … as well as existing RAL facilities 622 Mbit/s network to SLAC and elsewhere RAL connection now 2.5 Gbit/s AFS server 100 TB Tape robot ( -> 330 TB -> 1 PB) Many years experience running BaBar software

12th September 2002Tim Adye3 Problems Disk problems tracked down to a bad batch of drives All drives are now being replaced by the manufacturer our disks should be done in ~1 month By using spare servers, replacement shouldnt interrupt service Some (inevitable) scaling problems due to the major expansion in the system Now that installation and (most) BaBar-requested features are setup, support staff can concentrate on reliability

12th September 2002Tim Adye4 Support Initially suffered from lack of support staff and out-of- hours support Two new system managers now in post Two more being recruited (one just for BaBar) Additional staff have been able to help with problems at weekends Discussing more formal arrangements

12th September 2002Tim Adye5

12th September 2002Tim Adye6 RAL Batch CPU Use

12th September 2002Tim Adye7 RAL Batch Users (running at least one non-trivial job each week) A total of 113 new BaBar users registered since December

12th September 2002Tim Adye8 Data at RAL All data in Kanga format is at RAL 19 TB currently on disk Series-8 + series-10 + reskimmed series-10 AllEvents + streams data + signal+generic MC New data copied from SLAC within 1-2 days RAL is now the primary Kanga analysis site See Nicoles talk for details

12th September 2002Tim Adye9 Changes since July Two new RedHat 6 front-end machines Dedicated to BaBar use Login to babar.gridpp.rl.ac.uk Trial RedHat 7.2 service One front-end and (currently) 5 batch workers Once we are happy with the configuration, many/all of the rest of the batch workers will be rapidly upgraded ssh AFS token passing installed on front-ends So, your local (eg. SLAC) token is available when you log in Trial Grid Gatekeeper available (EDG 1.2) Allows job submission from the Grid Improved new user registration procedures

12th September 2002Tim Adye10 Plans Upgrade full farm to RedHat 7.2 Leave RedHat 6 front-end for use with older releases Upgrade Suns to Solaris 8 and integrate into PBS queues Install data dedicated import-export machines Fast (Gigabit) network connection Special firewall rules to allow scp, bbftp, bbcp, etc. AFS authentication improvements PBS token passing and renewal integrated login (AFS token on login, like SLAC)

12th September 2002Tim Adye11 Plans Objectivity support Works now for private federations, but no data import Support Grid generic accounts, so special RAL user registration is no longer necessary Procure next batch of hardware Delivery probably early 2003

12th September 2002Tim Adye12 Summary Significant hardware available, and now being fully used Disk problems now understood and being fixed Improvements planned and underway to make using RAL as SLAC-like as possible (but faster, and maybe better!) Join us! See BaBar home page -> New Accounts Contact Emmanuel Olaiya (at SLAC) or me (at RAL) for help