There is a nice simulation of VMware vSphere FT available on the net I want to share with you. During the simulation you have the possability to enable FT logging, enable FT for a VM and simulate a faillure of the primary VM which is running FT.
You can access the Flash simulator here:
It’s a short simulation of how FT works in the real world without installing multiple VMware vSphere hosts and VM’s. The simulator allows you to activate FT and shows the benefit of this technology.