Two-Server“ Hypercube Queueing Model a Distinguishable servers a Different workloads(due to geography) a Can appear with or without queueing AWith--usually FCFS AWithout--usually means a backup contract service is in placeTwo-Server “Hypercube” Queueing Model aDistinguishable servers aDifferent workloads (due to geography) aCan appear with or without queueing `With -- usually FCFS `Without -- usually means a backup contract service is in place