How to Upgrade to VMware vCenter 7 and vSAN 7
VMware vCenter is one of the main components of VMware vSphere and is used for centralized management of ESXi hosts, clusters, virtual machines and other vSphere components. If you want to upgrade from vSphere 6.7 to vSphere 7, vCenter is the first component that must be upgraded. After upgrading vCenter, you can upgrade ESXi hosts and vSAN (if used). This blog post explains how to upgrade vCenter 6.7 to vCenter 7.0.