/** @inheritdoc */
 public function index()
 {
     $asgn_servers = Server::join('cluster_server_asgn_t', 'server_id', '=', 'id')->get();
     $excludes = [];
     foreach ($asgn_servers as $obj) {
         array_push($excludes, $obj->id);
     }
     $not_asgn_servers = Server::whereNotIn('id', $excludes)->get();
     $result = array_merge(json_decode($asgn_servers), json_decode($not_asgn_servers));
     return \View::make('app.servers')->with('prefix', $this->_prefix)->with('servers', $result);
 }