Looking to get some guidance on upgrading an ArcGIS Enterprise site from 10.7.1 to 10.9.1 when the existing site only uses a single web adaptor. As it stands the Portal and Server site both share the same web adaptor (arcgis) and as dictated by ESRI documentation, this isn't supported anymore. My thought was to follow the below workflow to complete this upgrade, but was looking for any additional guidance or advice.
1. Unregister existing web adaptor with ArcGIS Server
2. Upgrade Portal
3. Uninstall/Re-install web adaptor for Portal --> use "arcgis" name
4. Upgrade ArcGIS Server (AGS)
5. Install web adaptor for AGS --> use "server" name
6. Upgrade datastore