[rrd-users] Re: Weird #'s from basic rrdgraph

[Tobias Oetiker]

Yesterday Clarence Hart wrote:

 |
 |
 | Hey all,
 |
 | 	I have a quick question.  Heres the senerio:
 | 	Note: Im graphing  how many pages printed per/half hour from HP
 | 	      printers.
 |
 | 	I create an rrd (filename 1.rrd).
 | 	I use perl's " use RRDs; " command to a create the graph.
 |
 |
 |
 |         Why do I get different values when I make my start and end times
 |         over aprox 13days?
 |          -> If I choose to graph 5 days the max value would be 140 pages.
 |          -> If I choose to graph 20 days the max value would change to ~70
 | pages.
 |
 |          Why does this happen?

if you are graphing averages and print the MAX of these averages,
then obviously the averages will even out the lower a resolution
you choose and the max will go down accordingly

tobi
 |
 |
 |          ---------------Heres my create and graph script.------------------
 |
 |          $time equals the first time in the file.
 |          RRDs::create("/tmp/1.rrd", "--start", "$time-1", "--step", "1800",
 |         "DS:value:COUNTER:2100:U:U",
 |         "RRA:AVERAGE:0.5:1:35040","RRA:MAX:0.5:1:35040","RRA:MIN:0.5:1:35040");
 |
 | 	----------------Heres how I create the graph-----------------------
 |
 | 	@options=("-l 0","-s $starttime","-e $endtime",
 |                   "-v pages per half hour",
 |                   "-cCANVAS#F5FFFA","-cGRID#D2B48C",
 |                   "-h $height","-w $width",
 |                   "-u 25","-aGIF",
 |                   "-t $title $currenttime");
 |         @DEF=();
 |         @PLOT=();
 |         @LEGEND=();
 |
 |         $newstr="DEF:${i}A=$foobar:value:AVERAGE";
 |          push(@DEF,$newstr,
 |             "CDEF:${i}${oida}=${i}A,1800,*",
 |             "LINE2:${i}${oida}$colors{$i}:$oida \: ","COMMENT: \t ",
 |                  "COMMENT:      $printerdevices{$databasename} - AVG",
 |                  "GPRINT:${i}${oida}:AVERAGE:%4.0lf",
 |                  "COMMENT:MAX",
 |                  "GPRINT:${i}${oida}:MAX:%4.0lf",
 |                  "COMMENT:MIN",
 |                  "GPRINT:${i}${oida}:MIN:%4.0lf",
 |                  "COMMENT:LAST",
 |                  "GPRINT:${i}${oida}:LAST:%4.0lf\\n");
 |
 | 	push(@LEGEND,
 |            "HRULE:$FIXED#FF0590:Base Line $FIXEDLABEL pages",
 |            "HRULE:-$FIXED#FF0590:",
 |            "HRULE:0#000000:");
 |
 | 	$fileOutFinal="/tmp/file.gif";
 |         RRDs::graph(( -w $fileOutFinal)? $fileOutFinal : $fileOutFinal ,
 |                 @options,
 |                 @DEF, at PLOT, at LEGEND);
 |
 | 	------------------------------------------------------------------
 |
 |
 | Thanks
 |
 |
 | Clarence Hart
 | UPS
 | Office: 410-560-4182
 | Fax:    410-560-4329
 | chart at ups.com
 |
 |
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 |

-- 
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