ALZDBA (7/6/2009)

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Just another thought: You are at the console, or are using a remote desktop solution to run SAC, right ?





We now only have SP3 instances with sql2005 and are not experiencing the problem you state.

How To apply SP3:
www.sqlservercentral.com/articles/Installation/66128/

Play it safe: start with a full backup of your instance(s)


fyi:
We didn't encounter problems when upgrading from sp2 cu2 to SP3 on our 2-node sql-cluster (multiple instances).
We do pay attention for the cluster resource to reside on the same node as the sql instance to be upgraded.
We even upgraded multiple instances in a single run. We moved all instances to the same node before starting the upgrade.

Off course it will not hurt to have a spare/backup set of resource db files !
We take a copy of them after every upgrade (because at that moment is planned downtime).

One thing we did observer is the needed reboot after the first instance + the client software have been upgraded.