Currently, when attempting to create a hosted feature service in Portal and when the ArcGIS Data Store is in read only mode, there is no notification in Portal and the page just endlessly spins saying "Creating feature layer."
This results in wasted time for server administrators going down the rabbit hole of trying to troubleshoot the problem when a simple notification in Portal when trying to create a hosted feature service stating that the ArcGIS Data Store is in read only mode would be an easy and informative fix.
I think it is odd behavior that Portal still allows you to attempt to create hosted feature services when the ArcGIS Data Store is in read only mode. It should either block that functionality completely, or at least notify you that it is unable to due to being in read only mode, as opposed to Portal just endlessly attempting to create a hosted feature service with no success and no error messages.
