On Feb 3, 2008 12:48 PM, Gwenael Lahay <[EMAIL PROTECTED]> wrote: > Hi, > > But, if i did not put zero value in the rdd, the rrd tool never calculates > correctly the average value for 5 minutes and half and hour. > For example, i have the following value for a 5 minutes interval : > NaN 3 NaN NaN NaN NaN > The program store a NaN data for this 5 minutes interval. > > Perhaps, i have made a mistake in my creation parameters ? > It is also possible that the values that i stored are so small that the rrd > tool calculte an average of zero ?
Gwenael, One way to alter this behavior is to increase the xfiles factor (xff when defining your RRAs). In this case, if the xff for your 5-minute RRA is set to 0.8 or higher, the "average" across five minutes would be set to 3 (as up to 80% of the steps are allowed to be NaN, and the steps without recorded values will be ignored for calculation purposes). If you expect the average to be set to 3/5 = 0.6, then you do have to enter zeros for each step rather than leave them as NaNs. The NaN values indicate an unknown quantity. If you are measuring a recording a zero value, you should enter this into the RRD. If this is causing a performance problem, remember that you can collect and batch several RRD updates to run at once. Please see the archives of this mailing list for more information. Thanks, Sam Umbach [EMAIL PROTECTED] _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
