From the perspective of clients, it will appear as if they are connecting to a single server. This destination address, however, will actually be a virtual server on your FortiADC appliance. Once the appliance receives traffic at the virtual server’s IP address, it must apply changes such as decryption and content rewriting (if required) before using the virtual server’s selected session persistence and load balancing methods to distribute the packets to your pool of servers.
Unlike virtual IPs on FortiGate or virtual servers on FortiWeb, virtual servers on FortiADC are activated as soon as you configure them. You do not apply them by selecting them in a policy.
To configure a virtual server, first configure all profiles that it will use, then go to Server Load Balance > Virtual Servers.