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:
Table
| Fail over condition | Downtime |
|---|---|
| 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. |