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Use a minimal downtime upgrade to upgrade VCS. This procedure minimizes downtime for the cluster that you want to upgrade. In situations where you can fail over all your service groups to running nodes, downtime equals the time that it takes to offline and online the service groups. In situations where you have a service group that you cannot fail over to a running node during upgrade, downtime for that service group equals the time that it takes to perform an upgrade and reboot the node.