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Cheshire Cat Computing • View topic - abnormal peaks

Cheshire Cat Computing

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 Post subject: abnormal peaks
PostPosted: Fri Sep 10, 2004 11:28 pm 
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PostPosted: Sat Sep 11, 2004 3:47 pm 
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Sounds as if it might be due to counter rollover. Are you using SNMPv2? If not, then try to always use SNMPv2 when tracking a gigabit interface. You can add the :::::2 to the end of the Target definition to get this.

Steve

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PostPosted: Sun Sep 12, 2004 8:19 am 
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I'm always using the 64bit counters (wherever they're supported).
that is not the problem unfortunately.

I should have pointed out that the "average traffic" spike is valid. Its just that the "max traffic" corresponding spike (the magenta one) is definitely exaggerated (a 5Mbps spike becomes a 70Mbps max spike), thats my problem.

Any ideas?[/img]


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PostPosted: Sun Sep 12, 2004 10:11 pm 
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Are you sure that the peak line is not valid?

After all, if you have an average (for the day) of 15Mbps, then its not unreasonable to think that for some 5-minute period during that day, the traffic averaged at 70Mbps (assuming you are collecting data with a 5-min interval).

On the yearly/monthly graphs, the Peak lines tend to be way higher than the averages.

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PostPosted: Mon Sep 13, 2004 6:15 am 
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I'm sure that the peak line is not valid because we're talking about a 70Mbps peak on a 2Mbps link :) and I have quite a few of them...

The only way to include an image is through a web page?
[/img]


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PostPosted: Mon Sep 13, 2004 10:25 am 
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OK, that sounds reasonable... I have yet to hear of 70Mb going down a 2Mb link (although management frequently think it should be possible by 'just changing some settings somewhere')!

Have you checked to see if the 70Mb is stored in the RRD? I think it almost certainly is (meaning that its not a flaw in the display routines) however best to check.

Sometimes this can happen when the data collection is patchy, or if it is restarted with the counter at a lower value (so MRTG doesnt spot that its a first fetch) and your MaxBytes is not set correctly. (Make sure MaxBytes, or AbsMax, are set to prevent unreasonable values). You can use the Killspike utility to remove the spikes for the time being.

Check with the MRTG support groups for more help? This seems a MRTG issue rather than a routers.cgi one (not that I dont want to try and help out, but maybe other people can provide more knowledge)

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PostPosted: Mon Sep 13, 2004 9:51 pm 
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The abnormal traffic is stored in the RRD, I've checked that. I guess you're right, its not the frontend's problem, probably RRDtool's.

I have posted about this in the MRTG and RRDTool mailing lists but no luck...

After the analysis I did on the weekend I found out that most of the peaks occured at the same time, a few months back, so I'm now trying to find the connection...

Anyway, thanx again for all your help, its appreciated!


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