Install instructions if you want to install on to a new large disk:

0) attach new disk and boot guest,

1) partition new disk with cfdisk (included)

2) mkfs.ext4 and mkswap, mount

3) copy the contents of the image to the new disk image
cp -a /bin /boot /etc /home /lib /lib64 /media /mnt /opt /osbt /root
/sbin /usr /var /some-mount-point

4) Create a minimal /dev
mkdir -p /some-mount-point/dev/pts
mknod -m 600 /some-mount-point/dev/console c 5 1
mknod -m 666 /some-mount-point/dev/null c 1

5) Create empty directories for pseudo filesystems to mount to
called proc, run, srv, sys, tmp in /some-mount-point

6) Mount pseudo file systems in prep to chroot
export LFS=/some-mount-point
mount --bind /dev $LFS/dev
mount --bind /dev/pts $LFS/dev/pts
mount -t proc proc $LFS/proc
mount -t sysfs sysfs $LFS/sys
mount -t tmpfs tmpfs $LFS/run

7) chroot to mount point

8) grub-install /dev/sdb (or whatever the device node for the new disk is)

9) shutdown

10) boot from the new install on the larger disk.