[rrd-users] Re: newbie question

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Wed Apr 10 18:06:11 MEST 2002

Justin Knash wrote:

> I'm fairly new to rrdtool, but I have been using mrtg for about a 
> year.  I'm trying to graph some gigabit uplinks on some Cisco Catalyst 
> 6509 switches.  The problem I'm running into is that I get large spikes 
> every once and a while, and my graph ends up only showing the spike, 
> and not the rest of the data.  Any ideas?

1) Define "large spike".  If the spike is below 1 Gbps it could
   be a real spike actually occuring on your network ...
2) Make sure you've set proper min and max values; use rrdtool tune
   to check and, if necessary, correct this

Existing spikes that are a result of missing max values can be
removed by setting the max value, dumping the database then restoring
it again with the -r flag.

If (1) is the case then there's nothing you can do about it without
masking the thruth from the viewer.  It is reality in that case.

If you *really*need* to lye then you could use --upper-limit and --rigid
to set a fixed, low enough, maximum to the image -or- you could do the
CDEF magic as described in the tutorial.

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