[rrd-users] Dealing with spikes due to reachability

Chris Griffin cgriffin352 at gmail.com
Wed Apr 25 18:18:05 CEST 2007

Hi Tobi,
  Thanks much for the reply.  I am gathering the counters via SNMP and
sticking them in the RRD.  It could certainly be my script is doing
something strange or the counters on the device are bad.  Here is an

1177476720: 9.4890612231e+06 2.9579036894e+06
1177476780: 8.5973761145e+06 2.5438812261e+06
1177476840: 1.1431781896e+07 2.4706615931e+06
1177476900: 7.4283981724e+06 1.6079156964e+06
1177476960: 6.4564314793e+06 1.3670967431e+06
1177477020: 7.3552319106e+06 1.5764984066e+06
1177477080: 7.5163364545e+06 1.8946703756e+06
1177477140: 8.8674587301e+06 2.9133983388e+06
1177477200: 8.8006863297e+06 2.4467189794e+06
1177477260: 7.8335465325e+06 3.4685346764e+06
1177477320: 7.0441856350e+06 4.4907708048e+06
1177477380: 5.0908686855e+06 2.6347848034e+06
1177477440: nan nan
1177477500: nan nan
1177477560: nan nan
1177477620: nan nan
1177477680: 2.8324705690e+08 1.6997104436e+08
1177477740: 2.9551147168e+07 1.8751196979e+07
1177477800: 1.0710302450e+07 7.3736138421e+06
1177477860: 7.2621223932e+06 6.1738161450e+06
1177477920: 1.3439222568e+07 5.0075043135e+06
1177477980: 1.1995400814e+07 3.4084870120e+06
1177478040: 1.1174723730e+07 4.2610384889e+06
1177478100: 7.7140599417e+06 4.9523913324e+06
1177478160: 1.0547613079e+07 3.4652299262e+06
1177478220: 7.3043887142e+06 2.2552235838e+06
1177478280: 9.3090210810e+06 5.2120493205e+06

You can see just after the nan's I get a reading that is an order of
magnitude higher then everything looks fine.  Would you expect that RRD
would be able to deal with devices going away for short periods then


On 4/25/07, Tobias Oetiker <tobi at oetiker.ch> wrote:
> Hi Chris,
> there is no such function within rrdtool, but If you read counters
> of your device I can not see how you get this spike ... if you
> calculate information externally, it may be that the external
> calculation is to blame ...
> cheers
> tobi
> --
> Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
> http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902
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