[rrd-developers] Re: Spikes in RRD after a dead zone

Tobias Oetiker oetiker at ee.ethz.ch
Sat Feb 26 08:40:22 MET 2000

Yesterday you sent me mail regarding Spikes in RRD after a dead zone:

*> Hi Tobias,
*> I am noting some spikes that shouldn't be.  I am collecting in & out octets
*> on many network devices, and occasionally my polling routine cannot
*> hit a device.  When the connection is resestablished, I get spikes that
*> are just under the max I set for the RRD database.  However, seems
*> to me that RRD should recognize this 1st observation (after the the
*> series of Unknown reading) as a special case and not record these spikes.
*> Seems that RRD is reporting in the one interval, all traffic that was
*> incurred over the entire "Unknown" interval.
*> Is there a setting I have missed ?

no, your assumption is correct, the *UNKNOWN* entries do reset the
measurement ... can you try to store the update arguments you are
using to create this database 'problem' so that I can reproduce it ?
Best would be a little script which creates the database, then runs
the updates required to create the problematic spikes ...


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