Negative values not graphing correctly

[ctyler2621]

Graph Display

Selection_025.png (13.8 KiB) Viewed 928 times

Here is the gist of the problem. The graph is for negative numbers, the poller is getting the correct values as evidenced in the log below...

Code: Select all

08/09/2016 11:30:10 AM - SPINE: Poller[0] Host[128] DS[1954] SNMP: v1: 172.22.50.166, dsname: ubnt_staSignal, oid: .1.3.6.1.4.1.41112.1.4.7.1.3.1.104.114.81.12.97.59, value: -54
08/09/2016 11:30:10 AM - SPINE: Poller[0] Host[128] DS[1953] SNMP: v1: 172.22.50.166, dsname: ubnt_noiseFloor, oid: .1.3.6.1.4.1.41112.1.4.7.1.4.1.104.114.81.12.97.59, value: -98

However the graph starts with a value of zero, only for the first result and then no results are shown at all. Here is the config...

Code: Select all

/usr/bin/rrdtool graph - \
--imgformat=PNG \
--start='-86400' \
--end='-300' \
--title='SM - RF Signal' \
--base='1000' \
--height='120' \
--width='800' \
--alt-autoscale-max \
--lower-limit='-100' \
--vertical-label='Decibels' \
--slope-mode \
--font TITLE:10: \
--font AXIS:7: \
--font LEGEND:8: \
--font UNIT:7: \
DEF:a='/usr/share/cacti/rra/sm_ubnt_stasignal_1954.rrd':'ubnt_staSignal':AVERAGE \
DEF:b='/usr/share/cacti/rra/sm_ubnt_noisefloor_1953.rrd':'ubnt_noiseFloor':AVERAGE \
LINE1:a#00CF00FF:'Signal'  \
GPRINT:a:LAST:'     Current\:%8.0lf'  \
GPRINT:a:AVERAGE:'Average\:%8.0lf'  \
GPRINT:a:MAX:'Maximum\:%8.0lf\n'  \
LINE1:b#FF0000FF:'Noise Floor'  \
GPRINT:b:LAST:'Current\:%8.0lf'  \
GPRINT:b:AVERAGE:'Average\:%8.0lf'  \
GPRINT:b:MAX:'Maximum\:%8.0lf\n'  \
HRULE:-80#0000FFFF:'Threshold'

The HRULE with a value of -80 displays fine on the graph. The scale on the left shows 0 to -100 as you would expect. Any assistance is appreciated.

[opticadam]

I ran into a very similar issue trying to graph optical power levels. I found the issue with the data template. I changed the minimum value to -50. I then deleted and recreated the graph creating a new RRD file.

Hope this helps.

[ctyler2621]

Unfortunately, the graph template has a value of -100 already and I have deleted and re-created the graphs since setting that up. Thanks for trying to help, it is appreciated.

[opticadam]

Check the data template instead of the graph template. The is a minimum value on both templates.