[rrd-developers] Update ex post?

Tobias Oetiker tobi at oetiker.ch
Tue Aug 24 07:42:36 CEST 2010

Hi Thorsten,

Yesterday Thorsten von Eicken wrote:

>   On 8/23/2010 2:13 PM, Sebastian Harl wrote:
> > So, I don't see any reasonable way to solve that with the current
> > architecture (and I don't see any way how this should be improved).
> I believe there is disagreement about what the problem is. You define
> the problem as "insert values in the past in a manner that is
> indistinguishable from having inserted them at the correct moment in the
> first place". Your analysis is correct for that problem.
> In real life, the problem tends to be a different one, which is "insert
> values in the past in a manner that improves on the current form of the
> data, i.e., that makes the resulting RRD more useful than without these
> insertions." Put differently, I prefer some inaccuracy in the data over
> having data gaps or garbage data in my RRD.
> What many of us have built are tools that get at the second problem. It
> would be great if the RRD maintainers could accept some of these tools
> in the spirit of "sometimes the perfect is the enemy of the good".

sure ... lets see them :-)

I was just discussing this issue off-list, I think it would be
possible to do a reasonalbe job for average, min, max, last RRAs at
least ... not so sure about HW and COMP ... but I guess they are
much less common anyways ...


Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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