'Return True if the specified LDEV is V-VOL, False otherwise.'

def check_vvol(self, ldev):

    ldev_info = self.get_ldev_info(['sts', 'vol_attr'], '-ldev_id', ldev)
    if (ldev_info['sts'] != NORMAL_STS):
        return False
    return (VVOL_ATTR in ldev_info['vol_attr'])
