Title: State-control-limit-based rejuvenation modelling and optimisation of the virtualised cloud server
Authors: Weichao Dang; Jianchao Zeng
Addresses: College of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, China; Division of Industrial and System Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China ' School of Computer Science and Control Engineering, North University of China, Taiyuan 030051, China
Abstract: Software rejuvenation modelling and optimisation of the virtualised cloud server has been studied. A software rejuvenation policy on the virtual machines and the virtual machine monitor has been proposed in order to ensure high availability of the virtualised cloud server. The multi-component system, composed of the virtual machines and the virtual machine monitor, which are structurally dependent, has been reduced to the multiple two-component systems. The state-control-limit-based rejuvenation policy has been proposed and the joint probability density of the degraded state of the two-component VM-VMM has been derived. Furthermore, the solution to the joint probability density has been proposed. Finally, the stationary unavailability of the virtualised cloud server has been modelled. Numerical experiments have verified the correctness of the probability density function and the feasibility of the rejuvenation policy. The state-control-limit-based rejuvenation policy leads to lower unavailability of the virtualised cloud server in comparison with the lifetime-based rejuvenation policy.
Keywords: software rejuvenation; state-control-limit; virtualised cloud server; availability.
International Journal of Reliability and Safety, 2018 Vol.12 No.4, pp.406 - 428
Received: 12 Oct 2017
Accepted: 04 Aug 2018
Published online: 03 Nov 2018 *