LHCb and DataGRID - the workplan for 2001 Eric van Herwijnen Wednesday, 28 march 2001

Overview  WP 8 deliverables  Testing of Testbeds  Hooking up to the “LHCb GRID”  Grid-ifying the LHCb production tools  Planning next GRID brainstorming meeting

WP8 deliverables  Month 6: planning document with specifications of the GRID services required from the other working groups for the different phases of the WP  Month 12: Use case programs. Report on the interfacing activity of use case software to minimal grid services (first delivery of Middleware functions end Sep (M9)..Testbed1)

Testing of testbeds  Testbed0 available at CERN  5 machines, “LXPLUS”-like environment  no AFS, could be mounted r/o via NFS  local certificate authority  for accounts, see P. Martucci/S. Jarp  Not clear yet who will be part of Testbed 1 in September

Hooking up to the “LHCb GRID”  Have started a CVS repository “GRID”  First package: java job submission tools  Interested institutes can download, modify and install these tools  Keep a central common repository  Objective: outside institutes to supervise their local productions

1. Production started by filling out a Web form:  Version of software  Acceptance cuts  Database  Channel  Number of events to generate  Number of jobs to run  Centre where the jobs should run 2. Web form calls a java servlet that:  Creates a job script (one per job)  Creates a cards file (one-three per job) with random number seeds and job options (The cards files need to be accessible by the running job)  Issues a job submit command to run script in batch-> WP1 3. Script does the following:  Copies executable, detector database and cards files  Executes executable  Executable creates output dataset  Output copied to local mass store -> WP5  Log file copied to web browsable area  Script calls java program (see 4) 4. Java program calls servlet at CERN to:  Transfer data back to CERN -> WP2  Update meta-database at CERN -> WP2 LHCb Use Case for Datagrid (MC production)

Gridi-fying the LHCb production tools  First test (this week): submitting bb-bar inclusive jobs at RAL CSF (pbs) using the globus-run command  Second test (NIKHEF): modify production tools to allow submission of general jobs to pbs gradually replace datamove commands in the scripts by grid-ftp commands  Third test (september): try the modified tools on testbed1  Expect other institutes to participate

Next LHCb-Grid ‘brainstorming’ meeting  Hoping to have 2 day meeting in Bologna late May/early June (venue and dates to be confirmed) Hear about LHCb/Italy computing planning Review our general Computer Facility/GRID activities Review development of Data Analysis Model and mapping to GRID