[rrd-users] Problem with max when summing two values

[Erik A.Dahl]

I'm summing values from two different rrd files and am having an issue. 
  The PRINT statements for using average come out correctly but the max 
statements are always low (by around 4-5%).  Here is an example command 
with the output:

rrdtool graph --end=1058300000 /dev/null 
DEF:in0=rsm1/interfaces/gigabitethernet3_1.rrd:ds0:AVERAGE 
DEF:in1=rsm2/interfaces/gigabitethernet3_1.rrd:ds0:AVERAGE 
CDEF:insum=in0,in1,+ PRINT:insum:MAX:max\\:%.2lf%s 
PRINT:in0:MAX:max\\:%.2lf%s PRINT:in1:MAX:max\\:%.2lf%s

0x0
max:41.44M
max:21.64M
max:21.97M

21.64 + 21.97 = 43.61 != 41.44

Any thoughts?  I have moved the end time back before the last poll so 
that my DEFs aren't getting the last unknown value.

I'm using 1.0.41 on Solaris 2.8

-EAD

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