[mrtg] Re: drops in graph when summation

Alex van den Bogaerdt alex at ergens.op.HET.NET
Mon Jul 29 00:01:36 MEST 2002

Pavel Ruzicka wrote:

> I don't use rateup, I use MRTG with RRDTool.


> I have rate about 300Mbps with drops about 40Mbps.
> I use 64bit counters with ":::::2" in TARGET.
> I know about 114Mbps problem, but with 64bit counters, when I measure
> 1 Gb Ethernet it is OK.
> Problem is only with SUMMARIZED interfaces.
> Same interfaces measured independently are good without drops.

What do you mean by summarized. (I don't recall your original post.)
Are you using a target line like
   target[sum]: 1:public...  + 2:public... +3:public... and so on

If so: maybe some piece of software is using 32-bit variables.  That
could mean the sum of all values is modulo 2^32.

Try to write your own grapher script for RRDtool.  This shouldn't
be too hard.

First have a look at the tutorial.  Then use several DEF statements
to collect info from all of the .rrd files and use CDEF to calculate
the total.  Graph this CDEF.

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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