[rrd-users] problem with values when using width

[Andreas Horndasch]

Hi Tobi,

I checked the rrd file with 'rrdtool dump' and for the range I used, I could not find any unknown values...
There are only values between 0 and 1.

unknown values could only appear on the start of the graph or asking for values later then the end...

If I understood you right, you calculate the result depending on the number of pixels (the width of the graph).
Is that right?
If it is, how could I get the best result for a graph which should be shown on a html page? (using a big width to get a good result is looking a bit strange to my eyes)


Thanks for help.

Andy

-----Ursprüngliche Nachricht-----
Von: "Tobias Oetiker" <tobi at oetiker.ch>
Gesendet: 07.01.08 21:59:07
An: Andreas Horndasch <Horndasch.Andreas at web.de>
CC: rrd-users at lists.oetiker.ch
Betreff: Re: [rrd-users] problem with values when using width


Hi Andreas,

the reason for this is that the numbers below the graph do
represent what is IN the graph, by using a different with you
influence the number of pixles in the graph ... with your cdef you
flip values between unknown and 0 ... together I would assume that
this is able to produce said effect (0.1 % difference) ...

cheers
tobi

Today Andreas Horndasch wrote:

> Hi everybody,
>
> since four days I have problems using rrdtool with width and average.
>
> When i drow a graph with a width the result is an other as the result of a graph without width...
>
> For example:
> Using width value is: 99,92
> Not usind width value is: 99,82
>
> The start und the end values are the same.
>
>
> I created my database with:
> <---
> RRDs::create($rrdpfad, "-b 1016182000", "-s 60", "DS:values:GAUGE:1800:U:U",
>   	      "RRA:AVERAGE:0.5:1:12096",
>   	      "RRA:AVERAGE:0.5:6:17520");
> <---
>
> To get the values I use:
> <---
>     my ($averages, $xsize, $ysize) = RRDs::graph("$bild", "--imgformat", "PNG", "--start", "$start","--end","$end",
>                                                  "--title= Values in Prozent",
>                                                  "DEF:values=/opt/rrd/verfuegbarkeit/".$host.".rrd:values:AVERAGE",
>                                                  "CDEF:ava=values,UN,0,values,100,*,IF",
>                                                  "LINE2:ava#0000FF:Verfügbarkeit",
>                                                  "GPRINT:ava:AVERAGE:Verfügbarkeit im Zeitraum\\: %3.2lf%s \\j",
>                                                  "COMMENT:$von - $bis"
>                                                  );
> <---
>
> OR (with width)
>
> <---
>     my ($averages, $xsize, $ysize) = RRDs::graph("$bild", "--imgformat", "PNG","-w 10000", "--start", "$start","--end","$end",
>                                                  "--title= Values in Prozent",
>                                                  "DEF:values=/opt/rrd/verfuegbarkeit/".$host.".rrd:values:AVERAGE",
>                                                  "CDEF:ava=values,UN,0,values,100,*,IF",
>                                                  "LINE2:ava#0000FF:Verfügbarkeit",
>                                                  "GPRINT:ava:AVERAGE:Verfügbarkeit im Zeitraum\\: %3.2lf%s \\j",
>                                                  "COMMENT:$von - $bis"
>                                                  );
> <---
>
>
> Using the width of 10.000 will give a bedder result...
>
> But this result could not be printed in an htmlpage...
>
>
> Some ideas how to get the best result without using width?
>
>
> Thanks for help.
>
> Andreas
>
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>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902

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