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Hi, you might want to forward to your T3s. cheers alessandra -------- Original Message -------- Subject: Tier3s and SL6 OS migration Date: Tue, 29 Oct 2013 11:34:24 -0700 From: Asoka De Silva <[log in to unmask]> To: [log in to unmask] Managers <[log in to unmask]> CC: Nils Krumnack <[log in to unmask]>, Doug Benjamin <[log in to unmask]>, Federica Legger <[log in to unmask]>, Isabel Trigger <[log in to unmask]>, Attila Krasznahorkay <[log in to unmask]>, Alessandra Forti <[log in to unmask]>, Emil Obreshkov <[log in to unmask]>, Andreu Pacheco Pages <[log in to unmask]>, <[log in to unmask]> Dear Tier3 admins, ATLAS grid sites have been migrating to SL6 over the past few months and major issues are now resolved. We encourage all Tier3 sites to start migrating to SL6 and, at the same time, to cvmfs 2.1. As this is a disruptive process to users, we recommend to migrate before December 1st, 2013 so that there is a buffer before experts are unavailable during the holiday period and also to avoid migrating in January/February, when it might prove too disruptive as physicists finalize their results for the Moriond conference. Delaying is also inadvisable as there will be an ATLAS deadline (not known yet) to stop SL5 support as well as when cvmfs 2.0 is cut off from access. Note that for ATLASLocalRootBase: - some software will not be installed with latest SL5 versions; e.g. future root versions will be released only for SL6. - SL6 32-bit OS is unsupported in ATLASLocalRootBase. Please migrate to 64-bit OS with SL6. For this migration, here are documentation which may be helpful: 1. For SL6: https://twiki.cern.ch/twiki/bin/view/AtlasComputing/RPMCompatSLC6 which has a list of additional required rpms for ATLAS Notice that instead of installing each rpm listed above, you can install the HEP_OSlibs_SL6 metapackage rpm - (but keep it updated). https://twiki.cern.ch/twiki/bin/view/LCG/SL6DependencyRPM If you choose this route, please consult your cloud support first. Note that this metarpm package is used for Tier1/2 grid sites and will install software required for all LHC experiments and is recommended by WLCG. Alternately, if you only want ATLAS required software (as on the ATLAS RPMCompatSLC6 page), please do this after installing cvmfs on your SL6 machine: setupATLAS diagnostics checkOS which will list what is missing and how to install. (You should run this after the migration to check that there are no missing rpms even if you install the HEP_OSlibs_SL5 rpm.) 2. For cvmfs 2.1, the latest recommended version is 2.1.15: https://twiki.cern.ch/twiki/bin/view/AtlasComputing/Cvmfs21 3. For sites using xrootd: There is a glibc bug that will affect xrootd storage and clients in SL6. The work around is to set MALLOC_ARENA_MAX=1 (or small value) see this URL: https://indico.cern.ch/getFile.py/access?contribId=12&sessionId=0&resId=0&materialId=slides&confId=261676. (see page 5.) Note that after the migration, users should be able to continue using SL5 releases as before. (e.g. for Athena releases, setupATLAS asetup 17.2.8.7,slc5 (ie append slc5 for slc5 releases.) There are native Athena slc6 releases available but they are not yet used for production; For details, please refer here: http://atlas-computing.web.cern.ch/atlas-computing/projects/releases/status/ Thanks ! regards, Asoka (with many thanks to those in cc for feedback, discussions) ----------------------------------------------------------------------- Adr: ATLAS Tier-1, TRIUMF, 4004 Wesbrook Mall, Vancouver B.C. V6T 2A3, Canada Url: http://trshare.triumf.ca/~desilva/Personal <http://trshare.triumf.ca/%7Edesilva/Personal> Tel: (604) 222-7496 Fax: (604) 222-1074 -----------------------------------------------------------------------