Before you install the service pack and hotfixes, pause the other nodes. To do this, follow these steps:
1. Fail over to the new node.
2. Pause other nodes.
3. Install the SQL Server 2005 service pack.
4. Apply the appropriate hotfix if applicable.
5. Start the nodes that you paused.
Before you install the service pack and hotfixes, remove nodes that are possible owners. To do this, follow these steps:
1. Fail over to the new node.
2. In Cluster Administrator, remove other nodes that are possible owners from SQL cluster resources,
3. Install the SQL Server 2005 service pack.
4. Install the appropriate hotfix if applicable.
5. Add the nodes that you removed as possible owners.