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The only obvious problem I see in your configuration is io='threads'. This is unlikely to provide better performance than io='native'. Beyond that, I also don't recommend compiling any of these components (kernel, libvirt, QEMU) yourself unless you already have a deep understanding of them. Better to use a well-tested and known working package from a Linux ...


No, this is not possible. NFS is providing a network mount and is outside of the block-device scheduler settings.

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