As of now, we have a method to use intel VROC raid to configure from 4.16, however it is suitable for UPI method, as this needs some intervention to apply dummy device in OS itself, it isn't feasible with the IPI method. We need to have a documentation/steps for this,  as cu is unable to use IPI with vroc raid.

Below is the method to use for UPI method:

https://docs.redhat.com/en/documentation/openshift_container_platform/4.16/html-single/installation_configuration/index#installation-special-config-raid-intel-vroc_installing-customizing

There is no as such method of any supported way given in IPI BM installation Doc:

https://docs.redhat.com/en/documentation/openshift_container_platform/4.16/html-single/deploying_installer-provisioned_clusters_on_bare_metal/index