Hello, rrdtool is a tool to store normalized value, and aggregate data over time. To understand how rrdtool can help you, read this link : - http://www.vandenbogaerdt.nl/rrdtool/ Section "List of tutorials and the like".
In your rra, you store only MAX values for each step, so data collected is normalized using MAX function (see http://www.vandenbogaerdt.nl/rrdtool/min-avg-max.php). So you can only work with MAXIMUM of MAX, AVERAGE of MAX and MINIMUM of MAX. Because you keep all collected step in you RRAs, using CF MAX, AVERAGE or MIN get same data stored. I understand you want to display MAX value in graphed curve, MIN in graphed curve, AND MAX-MIN in graphed curve, independently of RRA CF function used to stored data. this other thread can help you : http://oss.oetiker.ch/rrdtool/forum.en.html#nabble-td7580778 A Solution can be : 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 ^ VDEF:kwhmax=kwhx,MAXIMUM ^ VDEF:kwhmin=kwhx,MINIMUM ^ CDEF:delta=kwhx,POP,kwhmax,kwhmin,- VDEF:dd=delta,LAST ^ 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" Best regards, Yannick > Hello Yannik, > thank youz for your quick response, > I am new to RRDTOOL > but this is a great tool... > > this is my create command: > rrdtool create c:/rrdtool/VSM.rrd --start $epoch_start --step 10 > DS:Watt_cur:GAUGE:60:U:U RRA:MAX:0.5:1:60480 DS:Watt_tot:GAUGE:60:U:U > RRA:MAX:0.5:1:60480 > you are right, I have no RRA:MIN > > Could you point me to the right create command? > I want to store two values > 1. the current energy in WATT ( this is a value from 0 to maybe >10000) > 2. the current power in kWh ( this is a value which increases each time > period) > I want to show power and delta energy in the graph ( which should be about > 10kWh / 24h) > > I want to show a second curevewith the delta of "Zaehlerstand max" and > "Zaehlerstand min" > and I want to "GPRINT" this value > do I need to recreate the database? > > > > > > > > > -- > View this message in context: > http://rrd-mailinglists.937164.n2.nabble.com/problem-calculating-the-difference-between-MAX-and-MIN-tp7581058p7581062.html > Sent from the RRDtool Users Mailinglist mailing list archive at Nabble.com. > > _______________________________________________ > rrd-users mailing list > rrd-users@lists.oetiker.ch > https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users > _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
