Given an arrival rate , the basic request number of machines is equal to μ. However, it is not enough to satisfy the different QoS requirements. For different QoS requirements, the corresponding number of machines are shown in Figs. 5 and 6. Figs. 5 and 6 are under the same scenarios as Figs. 3 and 4 correspondingly. From these two figures, we can see that, for the same arrival rate, different classes need different additional number of machines to satisfy different QoS requirements. Similarly, given a arrival rate , the heaviest traffic intensity the system can support under a givenQoS requirement is shown in Figs. 7 and 8.
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