Hi Thorsten, On Fri, May 07, 2010 at 11:26:09AM -0700, Thorsten von Eicken wrote: > Stupid question: what is the interval in network packets used for? I > would think that the only interval that matters in the end is the one > defined in the RRDs.
the interval is used to set the correct "step" setting when creating new RRD files, for instance. Another use is to detect values that have timed out: By default values that are collected every 10 seconds time out after 20 seconds while values that are collected once a minute time out after two minutes. > Does collectd do any combining of values within an interval? No. > Does the interval in the network packets have to match the one used in > the final RRD or else inaccuracies result? Short answer: Yes; longer answer: If the "step" (== interval) of the RRD files is wider / longer than the actual interval in between two updates, you will use accuracy but everything will still work smoothly. If the actual interval is larger than the "heartbeat" (which is 2*step by default in RRD files created by collectd), you will end up with gaps in your graphs or (depending on the "XFF" setting) totally empty graphs. HTH, —octo -- Florian octo Forster Hacker in training GnuPG: 0x91523C3D http://verplant.org/
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