[rrd-users] Re: Newbie question

[Alex van den Bogaerdt]

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:

   DEF:load=....
   CDEF:background1=load,4,GT,INF,UNKN,IF
   CDEF:background2=load,10,GT,INF,UNKN,IF
   ....
   AREA:background1#00CC00
   AREA:background2#FF0000
   LINE:load#0000FF:load

HTH
-- 
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