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Tier-0 migration to SL(C)6

This document provides an update on the migration from Scientific Linux 5 to Scientific Linux CERN 6 (SLC6) within the CERN IT infrastructure. It includes timelines, operational reports, compatibility assessments for experiments like ALICE, CMS, and LHCb, and outlines discussions from the WLCG Management Board meeting held on January 22, 2013. Critical points addressed involve compiler issues, missing libraries, and proposals for ensuring sufficient capacity for lxplus and batch services. The target date for full migration is set for the end of April 2013.

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Tier-0 migration to SL(C)6

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  1. Tier-0 migration to SL(C)6 HelgeMeinhard, CERN-IT WLCG Management Board 22 January 2013

  2. Facts (1) • RedHat Enterprise Linux 6 timeline • Scientific Linux CERN 6 certified on01 Feb 2012 • Report of operations’ coordination to GDB12 Dec 2012: SL6 is OK for ALICE, CMS and LHCb • Some ATLAS workflows cannot run on SL6

  3. Facts (2) • Migration to SLC6 has started in the T0 • Numerous services are running on SLC6 nodes already • (Small) test facility of lxplus: lxplus6.cern.ch • Associated (small) LSF batch capacity on virtual batch worker nodes according to demand • Public perception: Moving lxplus alias from SLC5 to SLC6 is “the migration” • Even after alias move, SLC5-based services will remain available • Right-sizing according to demands

  4. Proposal • Envisage lxplus alias move to SLC6 for a point in time not too far in the future • But still giving sufficient time for testing and corrective measures • Target date: end April 2013 • We will provide sufficient lxplus, lxbatch, and CE capacity • Procedure • Discussion in WLCG Architects’ Forum 17-Jan-2013 • Discussion in WLCG Management Board today • Offline follow-up • Discussion in experiment and other dedicated user meetings • Discussion in the IT Technical User Meeting18-Feb-2013

  5. Feedback so far • WLCG Architects’ Forum 17-Jan-2013 (my informal notes) • Issue is really the compiler rather the OS – gcc 4.6/4.7 are fine, 4.3 isn’t • A few external libraries and/or header files appear to be missing • Preliminary list (being verified): gfal, lcg-dm-common, lcg_utils, lfc, cgsi-gsoap, Castor client • General feeling that issues should be solvable by the timeframe proposed

  6. Comments? Questions? Approval?

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