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We present a performance study of a virtualized cluster based on the virtualization system KVM. We show benchmark results from the High Performance Computing Challenge (HPCC) application suite including the High Performance Linpack (HPL) benchmark. We also present the mechanism by which this cluster is connected to the Open Science Grid (OSG). Our results show that jobs with low amounts of network communication will only suffer moderate overhead (≈10%) due to virtualization, while MPI applications will suffer from a considerable overhead in the 60% range. The KVM cluster under investigation does prove to be suitable for current High Throughput Computing (HTC) grid usage on OSG where the Condor middleware is used.