Do you have shared storage? I am struggling to understand what you are trying to acheive here.
EVC is a VMware technology that masks functions that are available in newer chips to make them appear as an older chipset. this will allow functions such as vMotion and DRS to work.
we really need to know a little more, like what version and edition of vSphere are your using, do you have a shared storage (SAN, or NAS)