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

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.

You can perform a phased upgrade when the root disk is encapsulated.