[rrd-users] Maximum number of data sources/max cdef size.
rrdtool at martin.sperl.org
Sat Feb 10 13:23:09 CET 2007
I remember submitting a patch to Tobi that defines a CDEF called AVG,
that does ignore NULL values.
I now did check if this is in the SVN branch and I can confirm this is
Maybe this is what you can use...
P.s: I remember having used a very complex CDEF to work around this for
just 4 values and the patch to rrdtool was much shorter ;)
Simon Hobson wrote:
> 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.
> rrd-users mailing list
> rrd-users at lists.oetiker.ch
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the rrd-users