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Install SQL Server 2008 R2 SP1 in a SQL cluster

In our quest to deliver a secured SQL Server 2008 R2 cluster solution, I will continue from my last post Part3 with the installation of SQL Server 2008 R2 SP1. Please note that when installing SQL server 2008 service pack in a cluster, this needs to be installed on the Passive node at any point in time. If this is installed on the Active node, then SQL will require a reboot thereby defeating the purpose of clustering.