librenms-librenms/includes/polling/ucd-diskio.inc.php

<?php

$diskio_data = dbFetchRows('SELECT * FROM `ucd_diskio` WHERE `device_id`  = ?', array($device['device_id']));

if (count($diskio_data)) {
    $diskio_cache = array();
    $diskio_cache = snmpwalk_cache_oid($device, 'diskIOEntry', $diskio_cache, 'UCD-DISKIO-MIB');

    echo 'Checking UCD DiskIO MIB: ';

    foreach ($diskio_data as $diskio) {
        $index = $diskio['diskio_index'];

        $entry = $diskio_cache[$index];

        echo $diskio['diskio_descr'].' ';

        d_echo($entry);

        $rrd = $config['rrd_dir'].'/'.$device['hostname'].'/'.safename('ucd_diskio-'.$diskio['diskio_descr'].'.rrd');

        d_echo("$rrd ");

        if (!is_file($rrd)) {
            rrdtool_create(
                $rrd,
                '--step 300 
      DS:read:DERIVE:600:0:125000000000 
      DS:written:DERIVE:600:0:125000000000 
      DS:reads:DERIVE:600:0:125000000000 
      DS:writes:DERIVE:600:0:125000000000 '.$config['rrd_rra']
            );
        }

        $fields = array(
            'read'    => $entry['diskIONReadX'],
            'written' => $entry['diskIONWrittenX'],
            'reads'   => $entry['diskIOReads'],
            'writes'  => $entry['diskIOWrites'],
        );

        rrdtool_update($rrd, $fields);
    }//end foreach

    echo "\n";
}//end if

unset($diskio_data);
unset($diskio_cache);