This example's upgrade path follows:

• Move all the failover service groups from the first subcluster to the second subcluster.

• Take all the parallel service groups offline on the first subcluster.

• Upgrade the operating system on the first subcluster's nodes, if required.

• On the first subcluster, start the upgrade using the installation program.

• Get the second subcluster ready.

• Activate the first subcluster. After activating the first cluster, switch the service groups online on the second subcluster to the first subcluster.

• Upgrade the operating system on the second subcluster's nodes, if required.

• On the second subcluster, start the upgrade using the installation program.

• Activate the second subcluster.