I ran across this warning in the VMware Cloud Foundation (VCF) Installer when deploying VCF 9:
cluster <cluster name>: Evacuate Offline VMs upgrade policy configured for cluster <cluster name> on vCenter does not match default SDDC Manager ESXi upgrade policy. It has value false in vCenter, and default value true in SDDC Manager.
The fix is simple...
In the vSphere Client, click the three horizontal lines in the top left corner.
Click Lifecycle Manager.
Click Settings.
Click Images.
Click the Edit button for Images on the right side of the window.
Click the checkbox next to "Migrate powered off and suspended VMs to other hosts in the cluster, if a host must enter maintenance mode" to check the box.
Click Save.
Re-run the VCF Installer validations.