[rrd-users] --alt-autoscale question

Alex van den Bogaerdt alex at vandenbogaerdt.nl
Sun May 11 16:07:53 CEST 2014

There may be "--lower-limit 0", or a (possibly invisible) line at zero.

Try amending your example with either one and see what happens.


----- Original Message ----- 
From: "Christian" <chanlists at googlemail.com>
To: <rrd-users at lists.oetiker.ch>
Sent: Sunday, May 11, 2014 9:00 AM
Subject: [rrd-users] --alt-autoscale question

> Dear list,
> thanks for this great piece of software. I am using rrdtool in
> pnp4nagios to plot performance data. I am plotting a temperature and
> would like the y range to be set by the actual range of the data. So I
> modified the corresponding pnp4nagios template to use --alt-autoscale.
> Here is the command line pnp4nagios will send:
> /usr/bin/rrdtool grap - --width=500 --height=100 --start 139979062
> --vertical-label "" --title "lab_e102 / Check lab temperature"
> --alt-autoscale
> However, the lower limit on the y-axis will never be adjusted and always
> remain zero in the plot.
> /usr/bin/rrdtool grap - --width=500 --height=100 --start 139979062
> --vertical-label "" --title "lab_e102 / Check lab temperature" -l 21.0 -r
> will give me a scale that starts at 21.0 Celsius as expected. What am I
> missing here? I am attaching a picture of the graph generated with
> --alt-autoscale, but I am not sure it will make it to the list. The plot
> has values for min and max included, and they are correct, so
> --alt-autoscale should work. Thanks,
> Christian
> PS: This is rrdtool 1.4.7-2 as shipped by Debian wheezy.


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