[rrd-users] Re: Newbie question

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Tue May 28 16:54:07 MEST 2002

Bill Ryan wrote:

> Anyway, what I need is a database which will have true values (unlimited 
> upper boundary) but will graph, say, 0 -> 50, so the typical range of data 
> will be viewable - but when the load spikes to past 50, rrdtool will not 
> consider it an anomaly and will show the spikes only as topping out the 
> graph.  IOW, "-u 50" nicely keeps the graph between 0 -> 50, but removes the 
> spikes that go beyond ... and I need this information represented as well.

You could use the combination of "--upper-limit 4 --rigid" to always
stop graphing at 4.00

You could also choose to use the CDEF approach where you modify the
values as described by Serge.  This has a "side effect" (not really)
of also modifying the values used for GPRINT et al.

You are interested in signalling huge peaks.  You could setup an
AREA with a value of INF and plot this in a color depending on the
actual value.  This looks like a colored background. Something to start:


 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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