Quantifying Load Imbalance on Virtualized Enterprise Servers

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Executive Summary

Virtualization has been shown to be an attractive path to increase overall system resource utilization. The use of live Virtual Machine (VM) migration has enabled more effective sharing of system resources across multiple physical servers, resulting in an increase in overall performance. Live VM migration can be used to load balance virtualized clusters. To drive live migration, one needs to be able to measure the current load imbalance. Further, one also needs to accurately predict the resulting load imbalance produced by any migration. In this paper the authors present a new metric that captures the load of the physical servers and is a function of the resident VMs.

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