code: public function getStatisticsPartitionChart($partition, $period){
  			return json_decode(self::getClient()->getStatisticsPartitionChart($this->getDomain(),$partition, $period));
  		}
docs: Get Disk Properties
  Ajout by @Thibautg16 le 01/06/2014
  
  @param $partition
  @param $period
  
  @throws Exception\ServerException
  @throws \Ovh\Common\Exception\BadMethodCallException
  
  @return Object