Hi Peter, Today Peter Grotrian wrote:
> Hi > > I have just started using RRD and mostly it works just great. > > I have an existing framework which samples data from a system > every minute. To avoid load peaks, the sampling of the different > parts is spread around the seconds of a minute. For most measured > variables RRD does just the right thing by interpolating to the > step grid. > > However, part of the collected samples are maximum wait times of > queueing systems. These numbers are not guesswork but calculated > exactly while servicing. I am very much interested in seeing the > maxima of these maximum wait times later when I query a MAX-RRA. > Currently, RRD interpolates to the grid first and than computes > the maximum. > > I know I could set the step size to 1 second and no interpolation > would happen. This looks ugly to me, as I sample by the minute > and would have to set very high XFFs. I could also fake update > times by the exact minute but that would adversely affect the > non-maximum samples. I could use separate RRDs for queueing > system maxima and the rest but I'd rather have one RRD per > observed system module. > > Why do I post this on the developer list? > > I would try to implement a new DS, let's call it MAXGAUGE. This > DS would only be allowed for MAX-RRAs. Interpolation would not > happen but rather the update value would placed at the latest > step at or before the update time. > > What do you think of it? sounds like a sensible analysis to me :-) except that I would call the datasource type GAUGELATEST cheers tobi > Regards, Peter > > _______________________________________________ > rrd-developers mailing list > rrd-developers@lists.oetiker.ch > https://lists.oetiker.ch/cgi-bin/listinfo/rrd-developers > > -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch t...@oetiker.ch ++41 62 775 9902 / sb: -9900 _______________________________________________ rrd-developers mailing list rrd-developers@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-developers
