[rrd-users] mrtg verses rrd

[Wendy Etkind]

I'm seeing some much higher peaks using rrd than I see using mrtg. Below
is
the important snipets of code that I'm using, I enclosed both an mrtg
and a
rrd graph of the numbers generated overnight from the code below. Why
would
rrd report such higher peaks? My max speed on this link is 750000, rrd
is
reporting peaks higher than that. On a quick snapshot taken right now
the
numbers are close enough but over time rrd does not produce the same
graphs.
Has anyone else done a mrtg to rrd comparison?

Thanks for any help,

     Wendy


#!/usr/bin/perl
use RRDs;

# initialize rrd database
$rrd = "test.rrd";
$starttime = time - 60;
RRDs::create (
    $rrd,
    "--start", $starttime,
    "--step", 60,
    "DS:ifInOctets:COUNTER:1200:0:4294967295",
    "DS:ifOutOctets:COUNTER:1200:0:4294967295",
    "RRA:AVERAGE:0.5:1:600",  
    "RRA:MAX:0.5:1:600", 
    );

# this section runs every minute, all night
$ifInOctets, $ifOutOctets) = &snmpget($getStr, "ifInOctets.$portnum",
                                               "ifOutOctets.$portnum");
push (@exec, "./rateup", "$dir/mrtg/", $fullname, time, "u",
      $ifInOctets, $ifOutOctets, 750000, "l", $label, "c",
      "#00cc00", "#0000ff", "#006600", "#ff00ff", 
      "i", mrtg.gif, -750000, -750000, 400, 100,
      1, 1, 1, 1, 1);
$in = $ifInOctets * 8;
$out = $ifOutOctets * 8;
$str = time . ":" . $in . ":" . $out;
RRDs::update ($rrd, $str);

# create rrd graph
$endtime = time;
$starttime = $endtime - (18 * 60 * 60); # default: 18 hours of day
($averages,$xsize,$ysize) = RRDs::graph (
        rrd.png, "--imgformat", "PNG",
        "--start", $starttime,
        "--end", $endtime,
        "DEF:in=$rrd:ifInOctets:AVERAGE",
        "DEF:out=$rrd:ifOutOctets:AVERAGE",
        "AREA:in#00ff00", # green
        "LINE1:out#0000ff", # blue
);


-- 
Wendy Etkind (wendy at mitre.org)
Lead Technical Staff: The MITRE Corporation
(781) 271-3217, DSN 478-1186 x3217, fax (781) 271-8689

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-- URL : http://www.ee.ethz.ch/~slist/pantomime/rrd.png


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-- URL : http://www.ee.ethz.ch/~slist/pantomime/02-mrtg.gif


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