A bit offtopic, but:
> Fedora policy has always said that using the yum tool to update an installation to a newer release of the distribution is not supported; one is supposed to use a CD or the preupgrade tool for that purpose.
...is why I've run debian continuously since 1995 or thereabouts. And when I say continuously, I mean that one system image has survived that long (module restores from backup after failed hardware). And been upgraded (remotely, via ssh or (back in the day) rsh, in most cases!) for that long.
I can't believe the haberdashy distros don't consider this a feature.