AdaptiveManagementforNetworked.PDF

Adaptive Management for Networked Systems ALBERTO GONZALEZ PRIETO Licentiate Thesis Stockholm, Sweden, 2006 School of Electrical Engineering KTH, Stockholm, Sweden Akademisk avhandling som med tillstånd av Kungl Tekniska högskolan framläg- ges till offentlig granskning för avläggande av teknologie licentiatexamen onsdag den 7 juni 2006 i KTH, Stockholm. © Alberto Gonzalez Prieto, 2006 Tryck: Universitetsservice US AB 2 Abstract As networked systems grow in size and dynamicity, management systems must be- come adaptive to changing networking conditions. The focus of the work presented in this thesis is on developing engineering principles for adaptive management systems. We investigate three problems in the context of adaptive management for net- worked systems. First, we address the control of the performance of an SMS system. We present a design for policy-based performance management of such systems. The design takes as input the operators performance goals, which are expressed as poli- cies that can be adjusted at run-time. The system attempts to achieve the given goals by periodically solving an optimization problem that takes as input the policies and traffic statistics and computes a new configuration. We have evaluated the design through extensive simulations in various scenarios and compared it with an ideal sys- tem. A prototype has been developed on a commercial SMS platform, which proves the validity of our design. Second, we address the problem of decentralized continuous monitoring of net- work state variables with configurable accuracy. Network state variables are com- puted from device counter