[rrd-users] Re: Please Help! I get incorrect results from RRDtool

Alex van den Bogaerdt alex at ergens.op.het.net
Thu May 4 14:45:27 MEST 2006

On Thu, May 04, 2006 at 05:31:42AM -0700, Amir Baninajar wrote:

> The problem is that when I actually look at the data stored in the first RRA, all have values in decimal place (eg 1.6366666667e+00 etc).  I know that RRDtool stores figures in floating point format, 
> but shouldn't it have all zeros after decimal place instead of other values? The first RRA averages data everytime it reads, which means that there is nothing to average and it should store the integer as it is.
> here are the create and update statements
> create "TestRRD.rrd" --start 1146744377 --step 600 
> DS:PolImgTo:GAUGE:1200:U:U 
> DS:ITNImgTo:GAUGE:1200:U:U 
> DS:MFImgTo:GAUGE:1200:U:U 
> (there some more similar DS statements here)
> RRA:AVERAGE:0.5:1:144 
> RRA:AVERAGE:0.5:6:720 
> RRA:AVERAGE:0.5:144:365
> update "TestRRD.rrd" 1146744651:1:3:0:(some more similar values here)

1146744651 modulo 600 is not 0.  That is the "problem" (actually: a feature).

See the tutorials, the documentation, the detailed explanation on my site.

Alex van den Bogaerdt

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