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ALICE WLCG Operations Report - T1-T2 Workshop Summary, Tsukuba, March 2014

This report summarizes the ALICE WLCG operations discussed at the T1-T2 Workshop held in Tsukuba on March 5, 2014. Key topics included the migration to SL6, the smooth operations of CVMFS, and ongoing tasks related to the WLCG VOBOX and SHA-2 implementation. Additionally, the report addresses I/O asymmetries, upgrades required for gLite, and the need for user management with gLExec in ALICE pilot jobs. Recommendations for improving connectivity and middleware readiness were also outlined, emphasizing the importance of ongoing updates and site support for enhanced performance.

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ALICE WLCG Operations Report - T1-T2 Workshop Summary, Tsukuba, March 2014

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  1. ALICE WLCG operations report Maarten Litmaath CERN IT-SDC ALICE T1-T2 Workshop Tsukuba March 5, 2014 v1.0

  2. Things mostly done • SL6 migration • CVMFS • Fairly smooth operation – well done! • WLCG VOBOX • SHA-2 • gLExec

  3. SLC6 at CERN • Lower CPU-over-wallclock efficiencies • http://alimonitor.cern.ch?1081 • CERN-CREAM, CERN-L: SLC5 in CERN CC • CERN-SHA2: SLC6 in CERN CC • CERN-CVMFS: SLC6 in Wigner CC • I/O asymmetry CERN  Wigner jobs • All EOS data currently only in the CERN CC • To be continued…

  4. WLCG VOBOX • Please upgrade your gLite 3.2 VOBOX (if any) • https://twiki.cern.ch/twiki/bin/view/LCG/WLCGvoboxDeployment • Plus CVMFS, of course • Inbound connectivity to port 1975 (gsissh) from CERN networks facilitates expert assistance • IPv4 • 128.142/16 • 137.138/16 • 188.184/15 sic • IPv6 • 2001:1458::/32 • FD01:1458::/32

  5. EMI-3 and UMD-3 • EMI-2 and UMD-2 end of support 2014-04-30 • EGI will run a campaign to get affected services upgraded or switched off • The WLCG baseline is updated regularly • https://twiki.cern.ch/twiki/bin/view/LCG/WLCGBaselineVersions • EMI-3/UMD-3 essentially OK for any product • Some caveats may apply for certain products • Check known issues along with release notes • Significant issues usually documented on the baseline page • New product versions will continue to appear in EMI-3 + EPEL and (after Staged Rollout) in UMD-3 • At least for the time being – also see next page

  6. Middleware Readiness WG • WLCG working group to facilitate steady deployment of new versions, while keeping the infrastructure stable • https://twiki.cern.ch/twiki/bin/view/LCG/MiddlewareReadiness • Main concern for ALICE: new versions of XRootD? • Advanced sites may show the way – and get official WLCG recognition for their efforts! • Could we set up a small infrastructure parallel to production where new versions can be safely verified?

  7. gLExec • gLExec is a utility allowing user separation in multi-user pilot jobs • Let each user task run under a corresponding account • Helps dealing with security incidents and misbehaving jobs • WLCG sites must implement support for gLExec • ALICE jobs cannot use it yet, but adaptation is planned • The site setup is tested through SAM • Status: • https://twiki.cern.ch/twiki/bin/view/LCG/GlexecDeploymentTracking • Most ALICE sites done  thanks! • Only sites with a CE are concerned for the time being

  8. SAM tests • As of Jan 2014 the WLCG Availability and Reliability reports are no longer based on the tests by the Ops VO • The experiment tests are used instead • Test results are in the SUM dashboard • http://dashb-alice-sum.cern.ch/ • Tests simplified as of early March • No more tests via WMS, only direct CREAM tests • A temporary trick may be needed for the OSG sites • XRootD and VOBOX tests to be added “soon” • To be debugged, tuned and agreed for A/R profiles • Based on corresponding MonALISA tests

  9. Sites usually OK - thanks!However… • VOBOX issues • CE not ready for jobs, wrong proxy being used, MyProxy running out, … • Admins please check site issues page • http://alimonitor.cern.ch/siteinfo/issues.jsp • Subscribe to relevant notifications • http://alimonitor.cern.ch/xml.jsp • Files unavailable due to SE problem • See above • Absence of “system” library on WN • HEP_OSlibs rpm was created to avoid that

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