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M. Maurer, I. Brandic, R. Sakellariou:
"Enacting SLAs in Clouds Using Rules";
Talk: Euro-Par 2011 Parallel Processing 17th International Conference, Bordeaux, France; 2011-08-29 - 2011-09-02; in: "Euro-Par 2011 Parallel Processing Proceedings of the 17th International Conference", E. Jeannot, R. Namyst, J. Roman (ed.); Springer, LNCS 6852 (2011), ISBN: 978-3-642-23399-9; 455 - 466.

The emergence of Cloud Computing raises the question of
dynamically allocating resources of physical (PM) and virtual machines
(VM) in an on-demand and autonomic way. Yet, using Cloud Computing
infrastructures efficiently requires fulfilling three partially contradicting
goals: first, achieving low violation rates of Service Level
Agreements (SLA) that define non-functional goals between the Cloud
provider and the customer; second, achieving high resource utilization;
and third achieving the first two issues by as few time- and energy consuming
reallocation actions as possible. To achieve these goals we propose
a novel approach with escalation levels to divide all possible actions into
five levels. These levels range from changing the configuration of VMs
over migrating them to other PMs to outsourcing applications to other
Cloud providers. In this paper we focus on changing the resource configuration
of VMs in terms of storage, memory, CPU power and bandwidth,
and propose a knowledge management approach using rules with threat
thresholds to tackle this problem. Simulation reveals major improvements
as compared to recent related work considering SLA violations,
resource utilization and action efficiency, as well as time performance.

http://dx.doi.org/10.1007/978-3-642-23400-2_42

Project Head Ivona Brandic:
Foundations of Self-governing ICT Infrastructures