'Create an LDEV and return its LDEV number.'

def create_ldev(self, size, is_vvol=False):

    ldev = self.get_unused_ldev()
    self.create_ldev_on_storage(ldev, size, is_vvol)
    LOG.debug('Created    logical    device.    (LDEV:    %s)', ldev)
    return ldev
