Hello Dan, Thanks again.
So, in order to use reduce=MAX, the RRD must have an RRA with cf=MAX (Am I right?) But, the RRA that I'm using use maximun resolution (pdp_per_row=1), and contain 4 months of data using 300 sec. sample step; so an RRA with CF=MAX for this resolution will be the same as CF=AVERAGE or any other CF because use only one sample. Do I must duplicate the information creating two RRAs for max-resolution in order to avoid this problem ? (i.e. duplicate rrd file size?) Please correct me if I'm wrong. Best regards, Alejandro Galue. Dan Cech wrote: > Alejandro Galue wrote: >> Hello Dan, >> >> Thanks for your quick response. I really appretiate that. >> >> I included an attach with two files inside: >> >> the RRD called 379.framerelay1.rrd >> a perl script called graph.pl >> >> This file generate the graphs for the tests. >> >> The small graph use (500x150) and the big graph use (800x300) > > After looking through your attachment, I see that you are indeed using a > DS defined with AVERAGE, then attempting reduce=MAX. This is definitely > part of your problem, and will never give you consistent results. > > You should be consolidating the data using an RRA for each of the types > of data you wish to extract, so in your case you'd want and RRA for > MIN,MAX,AVERAGE and LAST for each DS at each resolution. Then you can > use the correctly aggregated data to get accurate figures out. > > Right now, your data is first averaged when going into the RRA, then > reduced with MAX, then aggregated in your graph. So you end up with the > maximum of the maximum of the average, the average of the maximum of the > average, etc. > >> I used "step=300:reduce=MAX" and "step=300" alone with no success, but >> the graphs is a little bit better than with or widthout "reduce=MAX". > > By fixing the step size, you're reducing the change between the 2 > graphs, by forcing them to use the same RRA, but your figures will still > be incorrect. > >> reduce=MAX is used for pixel reduction technique and is not related to >> consolidation function used to fetch data; am I right ? >> Is this a Bug ? > > See above, your data is not being consolidated in a way that would allow > rrdtool to answer the question you are asking. > > Dan > > -- > Unsubscribe mailto:[EMAIL PROTECTED] > Help mailto:[EMAIL PROTECTED] > Archive http://lists.ee.ethz.ch/rrd-users > WebAdmin http://lists.ee.ethz.ch/lsg2.cgi > > -- ___________________________________ Ing. Alejandro Galue. SYNC Consultores C.A. [EMAIL PROTECTED] http://www.sync.com.ve Telf. : +58 (212) 762-85-55 762-30-12 762-86-93 Cel. : +58 (414) 134-47-23 Fax. : +58 (212) 762-66-71 Skype : agalue MSN : [EMAIL PROTECTED] ___________________________________ -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/rrd-users WebAdmin http://lists.ee.ethz.ch/lsg2.cgi
