Autoscale with a fixed minimum. Or

[Alain Tesio]

Hi, I'd like to use the autoscale option for graphics but still keep the minimum at 0 (so an area twice bigger really means a value twice bigger)

[raX]

Yeah, I think that would be really cool too. I can think of a few situtions where it would make graphs looks nicer. Do you know if rrdtool can do this though? If it can, it should not be a problem for cacti to support it.

-Ian

[Alain Tesio]

Hi, it's supported by rrdtool, the option --alt-autoscale-max only autoscales the maximum value, so you should set the configured lower limit, see the patch below.

Another problem in rrdtool is that the man page says that the default lower limit is 0, but using alt-autoscale-max with no explicit lower limit autoscales the lower limit anyway.

Code: Select all

*** include/rrd_functions.php.orig      Sat Oct 19 16:57:19 2002
--- include/rrd_functions.php   Sat Oct 19 17:02:23 2002
***************
*** 362,367 ****
--- 362,368 ----
                                break;
                        case "2":
                                $scale .= "--alt-autoscale-max" . " \\\n";
+                               $scale = "--lower-limit=" . mysql_result($sql_id, 0, "upperlimit") . " \\\n";
                                break;
                }

[Alain Tesio]

Sorry it's the wrong column in the mysql query

[bulek]

I don't understand the disscusion I guess. Why don't you just use "--alt-autoscale-max" option in cacti Graph Configuration along with "Lower Limit" field? Seems to be simpler than patching the code.

- bulek

[Alain Tesio]

That's the problem, if I do what you write cacti doens't run rrdgraph with the lower-limit option, my patch fixes this.

[bulek]

You are right, I've never noticed this. Good point!

Shouldn't your added line be the following (two changes in red)?

$scale .= "--lower-limit=" . mysql_result($sql_id, 0, "lowerlimit") . " \\\n";

- bulek

[Alain Tesio]

yes sure !

[Guest]

THX a lot for this patch

Now the option "--alt-autoscale-max" works fine.