[mrtg] RRD graphs cant be right

[Stephen J. Wilcox]

Hi,
 I have an RRA which is produced by MRTG, I am producing a 24 hour graph using 
rrdtool, the graph is set to plot avg and max values just like mrtg would.

Its using the 30min max RRA to plot the max values on this graph, but the max 
plot is consistently higher than the avg. This can't be true for the 24 hour 
graph of 5 min averages where the max must equal the avg.

One other thing is the graphs should look identical and they are similar but I 
can see small differences.. for example the rrd graph shows slightly smaller 
values (eg 70mb instead of 78mb) , and some of the plotted points are definitely 
different (eg a 5 min plot shows a dip on one but not hte other).

Any thoughts before I start dissecting this?

Steve


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