When following this knowledgebase article to upgrade your SLES or OES server, be sure to bear in mind that the upgrade will overwrite any customisation that you've done in /boot.
While initially this may not seem like a problem, bear in mind that if you're running a VM then it's likely (one would hope) that you have the "clock=pit" kernel parameter implemented.
If this is not re-implemented after the upgrade your server's time will go wild and you'll kick yourself when you realise what happened!
Yes. It happened to me. ;)
Disclaimer: As with everything else at Cool Solutions, this content is definitely not supported by Novell (so don't even think of calling Support if you try something and it blows up).
It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test, test, test before you do anything drastic with it.