[rhn-users] Upgrading RH ES 3 -> ES 4

[Matthew Hardy]

Hi,

Is it possible/safe to do a live upgrade from RedHat ES 3 -> ES 4?
Version 4 has some new libraries and such that some of our software
really requires.  However, I'm not sure how different the two systems
are?  If the kernel is updated, etc., can the whole system be upgraded
(live) to the new version?  Server is remote, so complete reinstall is
out of the question.

If it is safe, do I just change my subscriptions for that server to
version 4 and let up2date handle it?

Thanks,

Matthew