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Consider the following two scenarios:
In either of these scenarios, you will notice that the SQL Server resource of all the SQL Server 2005 instances that are currently active on the node where the SQL Server 2008 setup actions are performed, enters a failed state in the Failover Cluster Manager.
Note: In the above statements, the phrase 'default configuration' implies that you install the SQL Server 2005 failover cluster using the default options during the setup process and did not make any changes to the failover action of the SQL Server resource after the setup has been complete. Also any stand alone (non-clustered) instances running on the node are not affected by this problem.
The default configuration of SQL Server 2005 failover cluster does not set the following policy on SQL Server resources:
All the instances of SQL server running on a node will always share the highest version of SQL cluster resource dll present on that node. When installing or upgrading to SQL Server 2008 for the first time, the setup process replaces the existing version of SQL cluster resource dll with a newer and a higher version. As part of this procedure, it shuts down SQL Server resources to avoid a system reboot at the end of setup. Hence, if the policy above is not set, the cluster will not attempt to restart the failed SQL Server resources.
Use Failover Cluster Manager (cluadmin.msc) to set the following policy for each of the SQL Server resources:
You should also consider selecting the following option on SQL resources to enable the cluster service to failover the resources to another node in cases where it is not able to bring SQL resources online on the same node.
The above options can be found by navigating to the Policies tab under the Properties pane of the resource.
Assume you have the following environment.
Scenario 1: Suppose you want to upgrade cluster instance 1 to SQL Server 2008. After you finish the upgrade on N1, cluster instance 2 will stay online; then you continue and finish the upgrade on N2, cluster instance 2 will become failed.
Scenario 2: Suppose you want to install a SQL Server 2008 failover cluster instance 3 (be it default or named instance) across both nodes. After you finish the installation on N1, SQL Server 2005 failover cluster instance 1 will become failed, and cluster instance 2 will stay online; then you continue and finish the installation on N2, SQL Server 205 failover cluster instance 2 will become failed too.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.
Article ID: 2000403 - Last Review: September 22, 2009 - Revision: 6.0