Phased upgrade limitations
The following limitations primarily describe not to tamper with configurations or service groups during the phased upgrade:
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While you perform the upgrades, do not start any modules.
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When you start the installer, only select VCS.
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While you perform the upgrades, do not add or remove service groups to any of the nodes.
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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.
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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.
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For very large clusters, you might have to repeat these steps multiple times to upgrade your cluster.
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