This is the LHCb-Edinburgh collaboration hints and tips on using the GRID

Hints and tips on running on the GRID for distributed analysis

The following things should be checked before you submit your Job:

  • Is the bookeeping operational?
    • without the bookeeping the conversion in DIRAC from LFNs to PFNs may not happen correctly
    • check Bookkeeping
  • Is DIRAC up and running?
  • Is the GRID actually working?
  • Are your files likely to be staged?
    • if your files are not staged to disk the "maximum reschedulings reached" error will occur in DIRAC
    • go to Bookkeeping and select PFNs at CERN of your sample (/castor/..../ast)
    • ssh into lxplus
    • run a stager query on a selection of files > stager_qry -M /castor/..../bst
    • if none of your files are staged give up, unless you have a very convincing reason to ask for them.

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