Port Graphs - second graph on 2-week and higher graphs

Help
1

I’m creating a NOC board and I was placing a graph on the dashboard to show us overall network traffic to the internet, when I noticed that one graph in particular (the internet edge port) seems to have a second graph in the image that I’m not sure what it’s representing.

Shown below, you can see a lighter green at much higher levels behind the darker colored graph - does anyone know what this represents?

graph.php.png2385×742 112 KB

Here’s the same thing, but to a lesser extent, on the 2-week graph for the same port:

graph.php2.png2385×742 277 KB

2

weird ghost graphs.

3

max values.

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4

If lighter shaded numbers are max values, what does the darker shaded graph represent?

5

Now or avg at a guess.

6

I would agree with average, as that would explain why it only shows up on graphs for a longer period. Would this be an RRD specific question?

I’m curious what would be the best way for a layperson to determine exactly what this is?

7

I dinked around with the graph rendering over various time periods and discovered this - it seem that when a graph has to switch to a point where there is less data resolution, or in other words when there is so much data to represent but it cannot be done in a single column of the graph.

Graph covering 1 week:

graph.php2.png2385×742 242 KB

Graph covering 1 week + 1 day:

graph.php.png2385×742 181 KB

You can see how the second graph has less resolution than the first and becomes more blocky. I don’t quite understand the reasoning for showing the two, as peak rate plus 95% line is really the only data I’d be interested in seeing.

8

RRD by design will consolidate data over time leading to lower resolution for longer periods

9

Yeah, and once you go to 1 week + 1 day it’s grabbing data from the lower-resolution RRD file.

includes/default.php has

$config['rrd_rra']  = ' RRA:AVERAGE:0.5:1:2016 RRA:AVERAGE:0.5:6:1440 RRA:AVERAGE:0.5:24:1440 RRA:AVERAGE:0.5:288:1440 ';
$config['rrd_rra'] .= ' RRA:MIN:0.5:1:720 RRA:MIN:0.5:6:1440     RRA:MIN:0.5:24:775     RRA:MIN:0.5:288:797 ';
$config['rrd_rra'] .= ' RRA:MAX:0.5:1:720 RRA:MAX:0.5:6:1440     RRA:MAX:0.5:24:775     RRA:MAX:0.5:288:797 ';
$config['rrd_rra'] .= ' RRA:LAST:0.5:1:1440 ';

which if you decode (I don’t have time right now) will tell you the resolution and time coverage of each RRD.

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