Last week I had some Upgrade problems on a failover cluster (SQL2000 to SQL2005). Well, the story hasn't finished yet. I still needed to install SP2….
Installation should be simple again. You just make sure you're running setup on the active node, select all options and go!
But no; halfway during the installation I get the message "A recently applied update, KB921896, failed to install". The setup continues and I can see the problem lies in upgrading the first (default) instance. Strangly enough, the second instance installs successfully.
Several google answers, but all just a bit different:
While I haven't figured out what the exact problem was, I have installed SP2 succesfully by failing over the instances to the passive node, and rerunning the setup on that node. Everything installed succesfully that time.