With vSphere 6.5 Update 2 and vSphere 6.7, VMware introduced enhanced linked mode support for embedded PSC deployments. So, customers could now get all of the features and benefits of using external PSCs but without the complexity of extra nodes or load balancers.
Customers who already are using external PSC deployments, a new utility is introduced in vSphere 6.7 Update 1. The converge utility allows customers with an external PSC deployment to migrate to an embedded PSC deployment.
Customers can protect vCenter Server and its embedded PSC using a native availability solution – vCHA (vCenter High Availability) – all without external components or load balancers.