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Stefan Schmid's Publications

On the Benefit of Virtualization: Strategies for Flexible Server Allocation
Citation key AFSS-BVSFSA-11
Author Arora, Dushyant and Feldmann, Anja and Schaffrath, Gregor and Schmid, Stefan
Title of Book Proceedings of USENIX Workshop on Hot Topics in Management of Internet, Cloud, and Enterprise Networks and Services (Hot-ICE '11)
Pages 1–6
Year 2011
ISBN 978-931971-84-3
Location Boston, MA, USA
Month March
Publisher Usenix
Abstract Virtualization technology facilitates a dynamic, demand-driven allocation and migration of servers. This paper studies how the flexibility offered by network virtualization can be used to improve Quality-of-Service parameters such as latency, while taking into account allocation costs. A generic use case is considered where both the overall demand issued for a certain service (for example, an SAP application in the cloud, or a gaming application) as well as the origins of the requests change over time (e.g., due to time zone effects or due to user mobility), and we present online and optimal offline strategies to compute the number and location of the servers implementing this service. These algorithms also allow us to study the fundamental benefits of dynamic resource allocation compared to static systems. Our simulation results confirm our expectations that the gain of flexible server allocation is particularly high in scenarios with moderate dynamics.
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