[rrd-users] problem calculating the difference between MAX and MIN

[Yannick Marquet]

Hello

I believe you're are using a rrd file without  RRA MINIMUM or MAXIMUM or 
both.

Can you post the "rrdtool create" command you used to create WSM.rrd ?

To use :
_
DEF:kwhx=VSM.rrd:Watt_tot:MAX ^
DEF:kwhn=VSM.rrd:Watt_tot:MIN ^
_
you need a leat on RRA:MAX:/xff/*:*/steps/*:*/rows/ and one 
/RRA:MIN:xff/*:*/steps/*:*/rows/

if you juste compute delta between MININUM and MAXIMUM of your average 
RRA, this is the wrong way to process.

Yannick Marquet

Le 27/06/2013 09:50, Stefan Bruder a écrit :
>
> _Hello list,
> I have a problem calculating thte difference between a MAX and a MIN value
> this is my GRAPH:_
>
> _rrdtool graph VSM.png --start end-24h --end now ^
> --title "Aktueller Stromverbrauch" --width 600 --height 330 
> --alt-y-grid --slope-mode ^
> --upper-limit 5000 --lower-limit 0 --rigid ^
> --color BACK#A9F5F288 --vertical-label "Verbauch in kW" ^
> DEF:Watt=VSM.rrd:Watt_cur:MAX LINE1:Watt#FF0000:"Verbrauchskurve" ^
> VDEF:Wavg=Watt,AVERAGE ^
> VDEF:Wmin=Watt,MINIMUM ^
> VDEF:Wmax=Watt,MAXIMUM ^
> VDEF:Wact=Watt,LAST ^
> DEF:kwhx=VSM.rrd:Watt_tot:MAX ^
> DEF:kwhn=VSM.rrd:Watt_tot:MIN ^
> VDEF:kwhmax=kwhx,MAXIMUM ^
> VDEF:kwhmin=kwhn,MINIMUM ^
> CDEF:delta=kwhx,kwhn,- ^
> VDEF:dd=delta,MINIMUM ^
> COMMENT:"\l" ^
> COMMENT:"Verbrauch max      " GPRINT:Wmax:"%%6.2lf [W]\l" ^
> COMMENT:"Verbrauch min      " GPRINT:Wmin:"%%6.2lf [W]\l" ^
> COMMENT:"Verbrauch          " GPRINT:Wavg:"%%6.2lf [W]\l" ^
> COMMENT:"Zaehlerstand max   " GPRINT:kwhmax:"%%6.2lf [kW]\l" ^
> COMMENT:"Zaehlerstand min   " GPRINT:kwhmin:"%%6.2lf [kW]\l" ^
> COMMENT:"                   " GPRINT:dd:"%%6.2lf [kW]\l" ^
> COMMENT:"Verbrauch aktuell  " GPRINT:Wact:"%%6.2lf [W]\l"_
>
>
> _I get this error:
> ERROR: the RRD does not contain an RRA matching the chosen CF_
>
> _I just want to display the diff from the MAX and MIN Value of 
> Watt_tot in VSM.rrd
> _
>
> _kind regards
> Stefan _
>
>
>
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