Once you have installed SQL Server 2005 clustering, your next step is to install the latest SQL Server 2005 service pack and hot fixes, which can be downloaded from Microsoft’s Web site. Installing a service pack or hot fix is fairly straightforward because they are cluster-aware. Once the service pack or hot fix setup program is started, it detects that you have a cluster and will upgrade all nodes simultaneously. Once setup is complete, you may need to reboot your servers and failover the nodes. Generally, once I have run the service pack, I like to reboot the active node first. Once it has rebooted, then I reboot the passive node. This way, failover and failback is automatic.
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