Major upgrade failure -> people maintain > 1 computer

[Alan Cox]

> Umm, AFAIK RHEL explicitly doesn't support upgrades across major releases. And 
> they wouldn't dare changing the UID lower limit between point releases, IMHO.

Thats really irrelevant. Do you think a large business has a 'flag day'
and upgrades RHEL x to RHEL x + 1 globally that day ???

> The thing is --- you need to do that "some nontrivial amount of work" when 
> upgrading the OS in both cases (Fedora and RHEL). It's just that with RHEL you 
> do that kind of work once every 5-7 years, while with Fedora you do it every 6 
> months.

I've not usually had to do much. Now and then it gets exciting. For the
most part I've just used yum upgrade to move between versions then fixed
up any oddments.

Preupgrade is getting better but I'd still take a backup first because
its failure cases are sometimes horrible, 

Alan