public static function addDS2RRDFile($rrdFileName, $newDS)
{
//Get Existing Datasources
$datassources = self::getDSFromRRDFile($rrdFileName);
//Add New DataSources
$datassources[] = $newDS;
//Create array with DS Options
$dsoptions = array();
foreach ($datassources as $ds) {
$dsoptions[] = RRD::getDSOption($ds);
}
//get RRD Options
$rrdOptions = RRD::getRRDFileOptions($dsoptions);
//Move OriginalFile to /tmp
$tmpFileName = "/tmp/tmp.rrd";
rename($rrdFileName, $tmpFileName);
//add source options
$rrdOptions[] = "-r";
$rrdOptions[] = $tmpFileName;
echo "\n\nUPDATE RRD\n\n";
print_r($rrdOptions);
echo "\n\n+++++++++++\n\n";
echo $rrdFileName;
echo "\n\n###########\n\n";
//create new RRDFile
//RRD::createRRDFile($rrdFileName,$rrdOptions);
$cmd = "rrdcreate " . $rrdFileName . " " . implode(" ", $rrdOptions);
echo $cmd;
echo "\n";
shell_exec($cmd);
}