I'm considering an analytical model for the cloud computing composed of:

- input load balancer (LB) with M/M/1/K

- P (PH) physical machines with hypervisors, each able to host V (VM) virtual machines.

So the total number of processing units N = P*V.

My question is shall I then put an M/M/1/K queue for each VM or for each PH? In other words, should there be P or N queues? What are the disadvantages and advantages of both approaches? Literature review shows there are both.

Thanks in advance for any comments,

P.

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