def image_get_root_disk_size(self, image_name):
        """Get the root disk size of the image

        :param image_name: the image name in image Repository
        :returns: the disk size in units CYL or BLK
        """
        try:
            return self._imageops.image_get_root_disk_size(image_name)
        except exception.SDKBaseException:
            LOG.error("Failed to get root disk size units of image '%s'" %
                      image_name)
            raise
Get the root disk size of the image

        :param image_name: the image name in image Repository
        :returns: the disk size in units CYL or BLK