Several times we need re-size our storage area. Normally, we expand volumes, but never shrink. Although it’s not common, this is possible too. Surfing on the web, I found that great article.
My tests worked gracefully! I extended this article above re-sizing the virtual disk image file, with qemu-img.
qemu-img convert -f qcow2 -O raw resize.img resize_raw.img qemu-img resize resize_raw.img 5360321024 qemu-img convert -f raw -O qcow2 resize_raw.img resize.img
5360321024 is exactly the size in bytes of the sum of all partitions.