Fault-tolerant virtualization

Virtualization is often used as a tool for resource consolidation in the server market. Virtualization is also used to simplify management tasks and provide high availability. However, the ultimate high availability feature, fault-tolerance, has been limited to special and costly hardware and software. This thesis will give an overview of how one can use virtualization tech- nologies to build a fault tolerant system, and show what would be the cost, in the sense of performance degradation when compared to a non-fault-tolerant system.