[rrd-users] Maximum number of data sources/max cdef size.

Simon Hobson linux at thehobsons.co.uk
Sat Feb 10 12:34:53 CET 2007

George Barnett wrote:

>I'm aggregating boxes into a graph to draw a cluster and I'm getting
>null values.
>Is there a maximum number of datasources in 1 graph?
>Is there a maximum size of a cdef?
>I've found that if I do this with only a few DS's, it works fine.  Maybe
>somebody has tried this before?



Are you aware that if ANY of the values is unknown them the result is 
unknown ? So for example, if you were not collecting samples for one 
system for a while, then you would have a gap in the graph.

You have to do a test for unknown values and replace them with zeros 
before adding them all together. Have a look back through the 
archives, it's come up before.

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