[mrtg] Re: Weekly Max Greater than Daily

[Alex van den Bogaerdt]

Jim McAtee wrote:

> With all the non-rate related items people are monitoring with mrtg (I know,
> using screwdrivers to hammer nails), you'd think the developers might have
> adapted it to handle such tasks.  All you would really need is a simple option
> that would be passed to rateup to tell it not to normalize the data.  If you
> get a gauge rate somewhere between timeslots at n*300 and (n+1)*300, just
> record that rate for time (n+1)*300 and be done with it.


Alright, let's work out an example.

If n*300 is 12:00 and thus (n+1)*300 is 12:05, we get the following:

at 12:00 you record a rate (gauge) of 100.  At 12:01 you record
a rate of 200.  The next sample comes in at 12:05 and is at rate
250.

So, for the entire interval of 12:00 to 12:05 MRTG/rateup/rrdtool
wants to calculate *one* rate.  Which one is it?
a) 200  because this was the first rate during that interval
b) 250  because this was the last rate during that interval
c) 0.2*200 + 0.8*250 because this is the averaged rate during that interval

The design is so that these calculations are done in a few steps:

1) calculate a rate
2) normalize this rate
3) store the normalized rate

A gauge is the result of step (1)
For step (2) together with RRDtool, you can use the consolidation
function LAST which will store, in this case, the rate 250.

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