Martin G. Metzker

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Many services provided over the Internet, like voice over IP and video on demand, increase the demand for assurances concerning the quality of the underlying network. A score of techniques for assurance of quality of service (QoS) have been devised for use within administrative domains. However, when paths cross the border of autonomous systems, assurance(More)
The advent of host virtualization has increased the number of management attribute classes and instances. At the same time an additional degree of heterogeneity has been introduced, due to different hypervisor products coupled with multiple guest operating systems. These changes obviate provisionary methods of harmonising management information. We analyse(More)
The quick adoption of virtualization technology in general and the advent of the Cloud business model entail new requirements on the structure and the configuration of back-end I/O systems. Several approaches to virtualization of I/O links are being introduced, which aim at implementing a more flexible I/O channel configuration without compromising(More)
The Internet is a platform providing connection channels for various services. Whereas for services like email the best-effort nature of the Internet can be considered sufficient, other services strongly depend on service-specific connection quality parameters. This quality dependence has led to dedicated content distribution networks as a workaround(More)
Quality of Service (QoS) in networks is an essential ingredient for providing attractive, reliable services to customers. In contrast to model layered protocol stacks, where resources are used exclusively, virtualization introduces a series of novel specific challenges, due to shared resources. This paper presents the model and mapping procedure of an(More)
In today’s information technology infrastructures Service Level Management (SLM) is considered a vital discipline of IT Service Management. Only by having a framework for establishing a common understanding of services and the manner in which they are used and provided, can next generation IT infrastructures (e-Infrastuctures) maintain a sufficient(More)
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