Pretty much everyone in particle physics (i.e. CERN et al) run Scientific
Linux, or RHEL, in a mixture of versions 3 and 4. Also, the reason people
are wary of upgrades is not that the packaging system isn't up to it (we
wouldn't 'upgrade' cluster machines anyway - it would always be a nuke
and re-kickstart) it's because (some of) the apps that run on top of the
system are insanely fragile.
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