'Extend a volume.
:param array: the array serial number
:param device_id: the volume device id
:param new_size: the new size (GB)
:param extra_specs: the extra specifications
:returns: status_code'

def extend_volume(self, array, device_id, new_size, extra_specs):

    start_time = time.time()
    self.rest.extend_volume(array, device_id, new_size, extra_specs)
    LOG.debug('Extend    VMAX    volume    took:    %(delta)s    H:MM:SS.', {'delta': self.utils.get_time_delta(start_time, time.time())})
