[rrd-users] Calculating Max Values from multiple sources.
lists at codeangels.com
Sat Mar 8 19:50:27 MET 2003
I have a problem here, which as far as I can see is not resolvable by
RRDTOOL, but still I would like to ask before I go and look for a way
Imagine that I have 4 fields in RRD Database, the data is saved with the
resolution of 1 minute, here are the 5 readings (5 Min Data)
Field R1 R2 R3 R4 R5
a 3 23 7 11 0
b 5 14 13 1 2
c 32 26 0 4 8
d 4 11 2 8 0
I want to graph MAX percentage which the field "a" makes out of sum of all
fields, formula is easy:
And this formula will work well if the data is shown in a native
resolution, the plot here will be (Numbers round up):
6.8 31 31.8 45.8 0
Now I want to plot data at lower resolution, that is: one pixel equals 5
minutes, but I still want to see the MAX which was ever reached during
those 5 minutes in one pixel, that is I want my pixel to be set to 45.8 in
Unfortunately as far as I understand what RRDtool will do is take maxes of
all fields during this period and calculate a final value out of those
a:23, b:14, c:32, d:11
Which will result in a pixel value of: 28.7.
Is there a way around this problem, besides of feeding precalculated "a"
value into rrd database (Unfortunately quite a PITA in our case).
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