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Testing Compatibility of EMI WNs with ATLAS Production and Analysis Frameworks

The EMI-WN testing initiative led by ATLAS, in collaboration with WLCG, aims to evaluate the compatibility of EMI Worker Nodes with production and analysis frameworks. The focus is primarily on EMI-II, while EMI-I is included for completeness. Efforts are being summarized, and various sites have begun testing, with particular thanks to contributors from the UK and IT. While some combinations have been validated, others remain untested. Future steps include installing EMI WN on CVMFS for additional tests and potential production use. Updates will follow on untested combinations and issues identified during testing.

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Testing Compatibility of EMI WNs with ATLAS Production and Analysis Frameworks

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  1. EMI-X WN testing from ATLAS Simone Campana

  2. We agreed with WLCG that experiments will test ASAP the compatibility of the EMI WNs with the production and analysis frameworks • Should focus on EMI-II. EMI-I reported for completeness. • ATLAS efforts are summarized in • https://twiki.cern.ch/twiki/bin/viewauth/Atlas/MWIntegration • Need to test both prod and analysis, also with direct I/O in some cases • then the SE flavor is important • Few volunteer sites have tested and reported • A particular thanks to UK and IT. ATLAS Computing Coordination promised infinite “gratitude” to participants • Some combinations have been tested and not reported but will soon • Some combinations have not been tested (see later)

  3. Status: • EMI-1/2 against DPM has been validated for Prod and Analysis (we thought) • w/o RFIO direct access: not used at the moment • StoRMvalidated against EMI-1 (in production at CNAF) • EMI-2 under test (queue exists at CNAF) • CASTOR has been validated against EMI-2 at RAL • dCache(and EOS) untested • Not easy to find a site • A bug has been recently reported about a hardcoded timeout in lcg-utils in EMI-2. Needs fixing (not easy to spot in the tests). • Next Steps • Install EMI WN on CVMFS and test from there • then we can also use it in production • we had it as a plan since quite some time • In the meanwhile, if a dCache site is willing to test, please do and report. • SL6 + EMI-II validation is also starting

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