I’m preparing to do an upgrade for several clusters consisting of 8 nodes or more, but I am unable to select the Batch Upgrade option. The dropdown for that option is grayed out. How can I select a Batch Upgrade?
The new Upgrade Advisor for 8.3+, where Automatic NDU's are supported, generates an ANDU plan. The manual steps are no longer included in the Upgrade Advisor for clusters that support ANDU.
The automatic upgrade automatically performs a rolling or batch upgrade based on the cluster size. Here's a document on the ANDU process: