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(.):  queueing theory, cloud nodes, service rate degradation, performance evaluation, optimal load
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(.):  This paper considers a cloud node operating model as an open infinite-server Markovian queueing system, taking into account various phases of the virtual machine lifecycle and the dependence of their performance on the number of virtual machines running in the node. We assume that each virtual machine can be in active and passive phases during operation, corresponding to different operating modes and resource requirements. This dependence arise because the node performance decreases due to competition between different virtual machines for its shared resources. In the proposed model, we take into account the decrease in performance using a service rate degradation function. Cloud node operation is described by a two-dimensional Markov process, which determines the number of machines in the active and passive phases. To study this random process, we apply asymptotic analysis, which allows us to derive formulas for approximating the probability distribution of this two-dimensional process. Using the obtained formulas and various performance criteria, we present examples of solving the node load optimization problem for fixed operating parameters.

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