[mrtg] mrtg & rrdtool & max values

[odie at rotta.tmt.tele.fi]

Hi!

I was hunting down a reason why current in/out is larger than
max in/max out in one graph.  I realised that the reason can
be found from mrtg:


my @args = ($rrd, '-b', $time-10, '-s', int($interval * 60),
                         "DS:ds0:$up_abs:$minhb:0:$absi",
                         "DS:ds1:$up_abs:$minhb:0:$abso",
                         "RRA:AVERAGE:0.5:1:600",
                         "RRA:AVERAGE:0.5:6:700",
                         "RRA:AVERAGE:0.5:24:775",
                         "RRA:AVERAGE:0.5:288:797",
                         "RRA:MAX:0.5:1:600",
                         "RRA:MAX:0.5:6:700",
                         "RRA:MAX:0.5:24:775",
                         "RRA:MAX:0.5:288:797");

Is there a reason why those MAX-values are consolidated by default 
and the samples taken at 5minute intervals are not used for MAX RRA?

This dampens the peak values considerably if the traffic flow is not 
steady.

-- 
  Osmo Paananen <Osmo.Paananen at sonera.com>            Tel: +358 2040 72263
  Systems specialist, Sonera Juxto / Internet Service Production





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