With any service packs, hotfixes, security patches, it is not recommended to apply it on production without testing it on a test environment.
It appears that SP1 was directly applied to the production cluster. Was Win2K3SP1 installed on both nodes (assuming a 2node cluster) or just one node? Since you have
a cluster, you can do rolling upgrade. The steps to apply sp1 on say node 1 will something like
1. Open Cluster Administrator, right-click Node 1, and then click Pause Node.
2. Right-click Node 1, click Move Group for all groups owned by Node 1 to move all groups to Node 2.
3. Install the Service Pack 1 on Node 1, and then restart the computer.
4. Check the System event log for errors. If you find any errors, troubleshoot them before continuing this process.
5. In Cluster Administrator, right-click Node 1, and then click Resume Node.
6. Right-click Node 2, and then click Move Group for all groups owned by Node 2 to move all groups to Node 1.
Test everything. If your results are not as expected like you saw, you failover the groups to Node 2 (which is still on RTM) and everything should be fine. Then you can
create a plan to backoff from SP1 on Node 1. If the tests are succesful, you can repeat the steps and apply SP1 on node 2.
Best Regards,
Uttam Parui
Microsoft Corporation
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