Virtual resource provision policy based on elastic reservation mechanism in cloud environments

To address the problem of resource overprovision in cloud environments, a virtual machine provision policy based on elastic reservation mechanism is proposed. It extends the conventional ondemand provision by introducing a novel elastic reservation mechanism, which allows cloud providers to accept user's over-reservation requests under certain conditions so as to improve the resource effective utilization and user's satisfaction. Theoretical analysis presents the approach to calculating the probability of elastic reservation, and experimental evaluation validates the effectiveness of the proposed policy and the effects of key parameter on system performance. The results show that comparing with existing techniques, elastic reservation based resource provision policy can significantly increase the resource effective utilization, and decrease the short-term resource under-provision caused by excessively reservations. ©, 2015, Systems Engineering Society of China. All right reserved.