[rrd-users] peak after NaN?

Nuno Gonçalves nunojpg at gmail.com
Mon Apr 13 17:16:45 CEST 2009

2009/4/13 Tobias Oetiker <tobi at oetiker.ch>:
> yes, because it is over the maximum periode duration, so the next
> sample will establish the start of the new periode ...

I've done some tests and I concluded that the RRA timespan is always
between two points that verify TIME%(rrd_step*rra_steps)==0. Is this
correct? What will the sample time decide about the periode in this

> from what you tell here I can not see what is going wrong ... best
> is, if you write a little demo script to show your problem ...

On the rrdtool fetch I provided,

>> >> >1239617640: 9.9586069400e+02 1.7373722021e+01 5.6504290012e+01
>> >> >1239617700: 9.9586000000e+02 1.7776053280e+01 5.7130494367e+01
>> >> >1239617760: nan nan nan
>> >> >1239617820: nan nan nan
>> >> >1239617880: 9.8159131106e+02 1.9585499172e+01 4.9668510483e+01
>> >> >1239617940: 9.9584083364e+02 2.0126658206e+01 5.0490830009e+01
>> >> >1239618000: 9.9583079547e+02 2.0435340373e+01 5.1061476218e+01

You can see a low-value of 981.59 for the first DS after the NaN time.
I didn't entered any value lower than 995.8, so that cannot be a


More information about the rrd-users mailing list