Re: DERIVE and rrd-min=0

On Thu, May 11, 2006 at 07:36:40PM -0700, Sean Whitney wrote:
> So following instructions at
> 
> http://cricket.sourceforge.net/support/doc/reference.html#datasource
> 
> I have set rrd-min=0 for several values, then I ran rrdtune to reset  
> the rrd-min values in the file.  I am wondering will it only set a  
> min value for future values?  Or will it removed old spikes from a  
> graph as well?

No, tuning the parameters doesn't do anything to the data already in the
RRD file.

You need to remove the old spikes manually.  If you do "rrdtool dump"
to a text file and load it back in with "rrdtool restore", rrdtool will
reject any data upon reloading that is outside of the bounds.

You can also use the "killspike2" tool from the Cricket contrib site,
which uses the method described above (dump and reload) to remove the
spikes.


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