I have 5 esxi servers and a vcenter 6.5 u2 in our environment. physical servers and storage are dell brand. esxi, vcenter, storage, physical servers firmware and san switch upgrade have not been done for a long time. now I want to upgrade esxi and vcenter to 7.0. first I will make firmware updates of physical servers, then esxi and vcenter updates. but there are storage and san switch. how should the ranking be ?