Z-Number and DEMATEL-Based Scheme to Enhance Energy-Efficient Workflow Scheduling and Virtual Machine Consolidation for Green Cloud Computing

Cloud computing and big data technologies are now experiencing significant global development, leading to the emergence of several data centres. Nevertheless, as the data centre building progresses, the issues of underutilization of server resources and excessive energy usage are becoming more apparent. In this regards a novel approach called Z-NUM-DEMATELs, which combines an Integrated Z-NUMBER and DEMATEL-based Cooperation Enforcement for VM consolidation, is proposed to achieve two main objectives: reducing energy consumption and enhancing resource utilisation. The recommended method emphasizes the software level by using the adaptability of virtualization technology via the implementation of migration strategies. A power efficient utilisation factor is added to identify the hosts that are not being fully used. The utilisation factor limits the number of migrations, which might result in increased energy usage. The proposed method's effectiveness in enhancing energy efficiency and resource utilisation is demonstrated through experimental verification on the CloudSim simulation platform. This is achieved through a comparative study against benchmark solutions, and the numerical results confirm the superiority of the proposed method over existing solutions.