About phased upgrade

Perform a phased upgrade to minimize the downtime for the cluster.

Depending on the situation, you can calculate the approximate downtime as follows:


Fail over condition


You can fail over all your service groups to the nodes that are up.

Downtime equals the time that is taken to offline and online the service groups.

You have a service group that you cannot fail over to a node that runs during upgrade.

Downtime for that service group equals the time that is taken to perform an upgrade and restart the node.