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Re:Linux Played a Crucial Role in Discovery of 'Higgs boson' by dfc on Thursday July 05, 2012 @12:55PM (#4203797)
I doubt CERN has a formal run of the mill support contract with RH like other large organizations. Scientific Linux is developed (in-house) in partnership with Fermilab.[1]

[1] http://en.wikipedia.org/wiki/Scientific_Linux

Re:Linux Played a Crucial Role in Discovery of 'Higgs boson' by dchest on Thursday July 05, 2012 @01:16PM (#4203901)
They use RHEL too: http://linux.web.cern.ch/linux/rhel/

For offical usage in the context of Oracle production databases and eventually other applications requiring commercial support there is a limited number of Red Hat Enterprise Linux 6 Server, Red Hat Enterprise Linux 5 Server licenses available at CERN. For all other tasks standard CERN Linux distribution: Scientific Linux CERN shall be used.