Rick Dicaire wrote: >Hi folks, is '0' considered unknown when stacking?
No - but bear in mind that anything stacked on top of unknown is also considered unknown for drawing purposes. >I have 5 DS's, and I'm trying to stack them, most of the time each DS >value is 0.00: > >rrdtool lastupdate /var/db/rrd/hdd_tput.rrd > ada0 ada1 ada2 ada3 ad4 > >1310189105: 0.00 0.00 0.00 0.00 0.00 > >When graphing, I use this order: ad4 ada0 ada1 ada2 ada3 > >I STACK ada0 ada1 ada2 ada3. >If ad4 has a non-zero value, its correct value is graphed, using the >color configured for ada3. >Here are the definitions: > > "DEF:pre_ad4=$rrd:ad4:AVERAGE:step=300", > "CDEF:ad4=pre_ad4,1000000,*", > "LINE2:ad4#FF00FF:ad4", > "GPRINT:ad4:LAST:%4.0lf %s\\t", > > "DEF:pre_ada0=$rrd:ada0:AVERAGE:step=300", > "CDEF:ada0=pre_ada0,1000000,*", > "LINE2:ada0#e10000:ada0:STACK", > "GPRINT:ada0:LAST:%4.0lf %s\\t", > > "DEF:pre_ada1=$rrd:ada1:AVERAGE:step=300", > "CDEF:ada1=pre_ada1,1000000,*", > "LINE2:ada1#e1e100:ada1:STACK", > "GPRINT:ada1:LAST:%4.0lf %s\\t", > > "DEF:pre_ada2=$rrd:ada2:AVERAGE:step=300", > "CDEF:ada2=pre_ada2,1000000,*", > "LINE2:ada2#00e100:ada2:STACK", > "GPRINT:ada2:LAST:%4.0lf %s\\t", > > "DEF:pre_ada3=$rrd:ada3:AVERAGE:step=300", > "CDEF:ada3=pre_ada3,1000000,*", > "LINE2:ada3#0000e1:ada3:STACK", > "GPRINT:ada3:LAST:%4.0lf %s\\l" > >Example can be seen here http://www.ardynet.com/~ardy/ad4.png > >How can I stack each DS? You have ;-) Yes, it took me a few moments to work out what's happened here, but prepare for that "Doh" moment. You draw a line at the value of ad4, then you stack on top of it a line for ada0, then ada1 ... ada3. ada0 - ada3 are zero, so where do those lines get drawn ? Yes, right in the exact same pixels as the line you drew for ad4. So you've drawn a pink line, then overdrawn it with red, yellow, green, and finally blue lines - so all you see is the last one drawn, blue. If you change line to area I think you'll find it works out. Alternatively you could try experimenting with transparency (the 4th octet in the colour definition, eg 0000FF7F would draw a half transparent blue line) or dashes. -- Simon Hobson Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed author Gladys Hobson. Novels - poetry - short stories - ideal as Christmas stocking fillers. Some available as e-books. _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users