resize xen guest
dd if=/dev/zero of=file.img bs=1M conv=notrunc count=1 seek=5000 # 5GB losetup /dev/loop1 file.img #loop1 had to be used as xen was already running a different domU via loop0. e2fsck -f /dev/loop1 resize2fs /dev/loop1 e2fsck -f /dev/loop1 losetup -d /dev/loop1 5GB