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Bavarian Journal of Applied Sciences, 4 (2018), 342-353

The increasing cost of energy and the worldwide desire to reduce CO2 emissions has raised concern about the energy efficiency of information and communication technology. Whilst research has focused on data centres recently, this thesis identifies office computing environments as significant consumers of energy. Office computing environments offer great potential for energy savings: On one hand, such environments consist of a large number of hosts. On the other hand, these hosts often remain turned on 24~hours per day while being underutilised or even idle. This thesis analyzes the energy consumption within office computing environments and suggests an energy-efficient virtualized office environment. The office environment is virtualized to achieve flexible virtualized office resources that enable an energy-based resource management. This resource management stops idle services and idle hosts from consuming resources within the office and consolidates utilised office services on office hosts. This increases the utilisation of some hosts while other hosts are turned off to save energy. The suggested architecture is based on a decentralized approach that can be applied to all kinds of office computing environments, even if no centralized data centre infrastructure is available. The thesis develops the architecture of the virtualized office environment together with an energy consumption model that is able to estimate the energy consumption of hosts and network within office environments. The model enables the energy-related comparison of ordinary and virtualized office environments, considering the energy-efficient management of services. Furthermore, this thesis evaluates energy efficiency and overhead of the suggested approach. First, it theoretically proves the energy efficiency of the virtualized office environment with respect to the energy consumption model. Second, it uses Markov processes to evaluate the impact of user behaviour on the suggested architecture. Finally, the thesis develops a discrete-event simulation that enables the simulation and evaluation of office computing environments with respect to varying virtualization approaches, resource management parameters, user behaviour, and office equipment. The evaluation shows that the virtualized office environment saves more than half of the energy consumption within office computing environments, depending on user behaviour and office equipment. Die steigenden Kosten von Energie und die weltweiten Bemühungen CO2-Emmissionen zu reduzieren, führt aktuell zu einer intensiven Untersuchung der Energieeffizienz von Informations- und Kommunikationstechnologien. Während ein großer Teil der aktuellen Forschung sich auf Rechenzentren fokussiert, betrachtet diese Arbeit Büroumgebungen mit ihren Rechnern und dem verbindenden Netzwerk. Eine energieeffiziente Architektur wird vorgeschlagen, die auf die Virtualisierung und Konsolidierung von Diensten setzt, ohne auf zentralisierte Rechenzentrumshardware oder Thin Clients angewiesen zu sein.

This paper presents a new autonomic management architectural model consisting of a number of distributed management systems running within the network, which are described with the help of five abstractions and distributed systems: Virtualisation, Management, Knowledge, Service Enablers and Orchestration Planes. The envisaged solution is applicable to the management design of Future Internet as a service and self-aware network, which guarantees built-in orchestrated reliability, robustness, context, access, security, service support and self-management of the communication resources and services

The method of system virtualization is very popular for the use in data centers and desktop virtualization today. In this work, system virtualization is applied to core network elements (routers and links) in order to create a virtualized network. The selection of this virtualization method crucially determines the emerging network model. The network model consists of virtual networks, virtual routers, and virtual links that form overlays on top of the physical network. The properties, features, and limitations of this network model are analyzed and described in this paper. Additionally, a proof of concept implementation using currently available technology and infrastructure is presented. Finally the dynamic configurability of virtual resources in such a system virtualization based virtualized network is evaluated., Electronic Communications of the EASST, Volume 17: Kommunikation in Verteilten Systemen 2009