[rrd-users] Minor Graph Rendering Issue

Chris Mason chris at noodles.org.uk
Thu Dec 15 08:54:54 CET 2011


Interesting problem - even with "-A" it sometimes breaks and overflows
over the 0 line.
It appears to be the data, it appears to be struggling to display it
and sometimes "-A" fixes it but sometimes "-A" breaks it and it is
displayed normally without "-A".

Any ideas?


On 14 December 2011 20:35, Chris Mason <chris at noodles.org.uk> wrote:
> I have done some more testing and fixed the issue by passing -A to
> rrdtool graph.
> I was under the impression that it should autoscale to the data by default?
> Chris
> On 14 December 2011 16:11, Chris Mason <chris at noodles.org.uk> wrote:
>> Hi,
>> I have noticed that sometimes when I am graphing data using positive
>> and negative values to split Inbound and Outbound that the negative
>> side of the data slightly comes over the 0 line. The following image
>> shows an example:
>> http://netnix.org/example.png
>> I only see this occurring on some graphs, although I am using the same
>> method to generate them and it is seen more on 1 day graphs then
>> higher intervals:
>> DEF:ifInOctets=<RRD>:ifInOctets:MAX
>> CDEF:ifInOctetsBits=ifInOctets,8,*
>> CDEF:ifInOctetsBitsN=ifInOctetsBits,-1,*
>> I have tested this on an rrdtool snapshot from last week and I am
>> still seeing this.
>> Is this normal and if not where would you recommend I look to
>> investigate this problem further?
>> Thanks,
>> Chris

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