[rrd-users] Re: 95th Percentile - Values stored inside RRD file

Serge Maandag serge.maandag at staff.zeelandnet.nl
Thu Mar 24 10:17:34 MET 2005

> Thanks Serge, I've changed it to Counter type and I now see 
> that the output of rrdfetch is in transfer rates.


> Basically the router is returning me the amount of bytes that 
> has been transferred for every 300 seconds of SNMP poll. 

Almost Correct. The counter is continuously increasing with every
byte that passes. So the difference betweeen your last poll and
the current poll is the amount of bytes that have passed in the 

> Because this value is cumulative, there will come a time 
> where it's being resetted to 0 due to overflow.
> I'm curious if rrd is capable of detecting that the value has 
> wrapped around and compute the value correctly.

Rrdtool automatically detects and corrects 32 and 64 bits counter
overflows. You don't have to specify anything. Just make sure you
don't have 2 counter overflows within your polling period.

You have that for instance when polling a 32 bits counter every 5
minutes for an interface that transports more than 114 Mps.


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