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. |