loyola15 EMC PowerPath licenses are sold per CPU Socket and deployed per host. In your example you would need to purchase 3 * 2 = 6 CPU socket licenses.  Bob Lonadier PowerPath Product Manager
Going through past posts I've gotten some conflicting info on this.  Are EMC Powerpath licenses are licensed per processor or host (both)?  For example, if I’m buying 3 servers which have 2 processors each – do I need 6 licenses or 9? I believe at one point we were able to license just by host, but not sure if that still applies. 
Licensing