[rrd-users] clear values from RRA
A Darren Dunham
ddunham at taos.com
Wed Jan 14 01:40:42 CET 2009
On Wed, Jan 14, 2009 at 12:13:25AM +0100, Levente Kovacs wrote:
> I have another question. If you see my temperature sensor test site, you may
> realize the very first values of the blue and green lines to be -60. It is
> because my hardware has 3 ports, but only one (red) had an actual sensor
> connected to it. The unconnected ports read out the minimum measurable value,
> that is -60deg.
> Anyways... I'd like to clear those values from my RRAs. How can I do it?
> Shlould I write a perl script which modifys the XML dump? If I do so, and when
> I restore the data... will the newly aquired data lost which were recorded
> during the process of the XML?
You could continue collecting data yourself (perhaps just to a text
file). Insert that data after the conversion is complete and you won't
have lost any data.
> Or is there any way inside the RRD system to do say "do this and that with
> values smaler and/or larger then X".
You can set up a CDEF from your data at graph time that ignores values
smaller than X, then graphs that data rather than the recorded RRA data.
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