from the current implementation of resize of libvirt. when instance flavor is changed, we use qemu-img to change the instance disk size. so it's obvious that instance booted from volume cann't be resized , there is no volume API to extend existed volume also.
from the current implementation of resize of libvirt. when instance flavor is changed, we use qemu-img to change the instance disk size. so it's obvious that instance booted from volume cann't be resized , there is no volume API to extend existed volume also.