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libvirt virt-install use block device

Goal

I want to use /dev/sda10 as File System of my guest.

Recipe

Just replace the qcow file path with the device and remove the size parameter: 
 sudo virt-install --connect qemu:///system    -n xpsp2 -r 512 -f /dev/sda10   -c windowsxpsp2.iso    --vnc --noautoconsole    --os-type windows --os-variant winxp

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