[rrd-users] Re: peak generated when counter value fall to zero

[George Dau]

COUNTER data handles wrap-around very well, but you get huge problems with
early counter resets which can be caused by a re-boot, snmp reset, etc.
These cause the spikes you see. The solution is to change the data source
type from COUNTER to DERIVE and set a minimum value of 0 for the data
source. It has been discussed here at length recently, and DERIVE does work
well.

-----Original Message-----
From: Spyou [mailto:spyou at club-internet.fr]
Sent: Thursday, 1 March 2001 3:38 AM
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] peak generated when counter value fall to zero





Hi ppl !

i've looked up after this problem in the archive of the ML and found some 
words about it dated of july 1999 ...

This problem seems to affect all my counters (simple eth plotting with snmp 
and hand-maid counter like syn packets with ntop as well)

here's what a dump looks like :
<!-- 2001-02-28 16:58:00 CET / 983375880 --> <row><v> 6.2437777778e+03 
</v><v> 1.2493902778e+04 </v>
<!-- 2001-02-28 16:59:00 CET / 983375940 --> <row><v> 8.9177872713e+05 
</v><v> 1.7907601907e+06 </v>
<!-- 2001-02-28 17:00:00 CET / 983376000 --> <row><v> 1.1760162884e+04 
</v><v> 2.4809347659e+04 </v>

Values from 16:58 and 17:00 are quite good ... but 8.9e+05 and 1.7e+06 
don't match ...

I got an MRTG running on the same eth and grabbing infos each minuts and he 
didn't report anything looking like this

I assume this is caused by a counter set to 0 but i recursivly got peak for 
70-80% of the interfaces monitored (not the same each time ... :/) at the 
same time


anybody seen this before ? pleaaase :))
____________________________________
  'Spyou' - www.spyou.org - root at spyou.org
     #gtr / ircnet.grolier.net - UIN : 6871374

We've done so much, for so long, with so little
We're now qualified to do anything with nothing.


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