Prepare SQL Server 2005 in a clustered environment for SP3

Introduction Recently I was asked to create a new high-availability solution for MS SQL Server 2005. When I finished the installation of SQL Server 2005, I found myself troubled as to why the installation of SP3 failed with the update of the database services. After a lot of searching, I found the solution to my problem. Because I spend a lot of time figuring out why my installation failed I decided to write this article so other people won’t have to spend so much time and frustration installing the service pack.