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

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?

<snip>

>"CDEF:gclient_requests=1aggavgclient_requests,2ag gavgclient_requests,+,3aggavgclient_requests,+,4ag gavgclient_requests,+,5aggavgclient_requests,+,6ag gavgclient_requests,+,7aggavgclient_requests,+,8ag gavgclient_requests,+,9aggavgclient_requests,+,10a ggavgclient_requests,+,11aggavgclient_requests,+,1 2aggavgclient_requests,+,13aggavgclient_requests,+ ,14aggavgclient_requests,+,15aggavgclient_requests ,+,16aggavgclient_requests,+,17aggavgclient_reques ts,+"\

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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