public function onAllServer($strict = true)
    {
        foreach ($this->getServerConfig() as $idServer => $config) {
            if ($redis = $this->getRedisFromServerConfig($idServer)) {
                $this->selectedRedis[$idServer] = $redis;
            } else {
                if ($strict) {
                    throw new Exception('cant connect to redis '.$idServer);
                }
            }
        }

        $this->multiRedis = true;

        return $this;
    }