[rrd-users] Archives and missing data (NaN)

George Dau gedau at isa.mim.com.au
Fri Jan 5 03:54:09 MET 2001

I consolidate a lot of data with MAX. The data is network stats from many
switches and routers. We do loose a lot of responses, and normally get at
least one NaN per datasource per day. It seems that the consolidation
function returns NaN if there were any NaNs during the consolidation period.
Thus a single NaN on a day sumarises to NaN for the entire day.

The result of this is that all my Yearly graphs a blank (NaN).

Where do I look to fix this? Around line 560 in rrd-update.c?

I do not want to replace NaN with zero, or flat line it. Gaps are better in
the graphs, but if there is data there, it should not be overruled by the

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