Phased upgrade limitations

While you perform the upgrades, do not start any modules.

When you start the installer, only select VCS.

While you perform the upgrades, do not add or remove service groups to any of the nodes.

After you upgrade the first half of your cluster (the first subcluster), you need to set up password-less ssh or rsh. Create the connection between an upgraded node in the first subcluster and a node from the other subcluster. The node from the other subcluster is where you plan to run the installer and also plan to upgrade.

Depending on your configuration, you may find that you cannot upgrade multiple nodes at the same time. You may only be able to upgrade one node at a time.

For very large clusters, you might have to repeat these steps multiple times to upgrade your cluster.