This article assumes a KVM guest that runs from raw or qcow2 devices using emulated ide access. Since some time now, full virtualisation for block devices is available, facilitating the benefit of paravirtualisation. Benchmarked in bonnie++, the difference looks like this, revealing a way better performance of virtio:
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Frustrierend: NFS ist leider immer noch am effektivsten
Sammlung von open source perfomance/stress tools
