[rrd-users] Re: Storimg 5 min data for 2 yr

[Stephan Harren]

But if you graph for one year of data, this will be 105120 values on 600 
pixels. What kind of values will rrdtool graph with? I tried, and from my 
experience, the MAX graph is higher if you keep an rra for the MAX values 
than the MAX graph if you don't. I guess this happens because rrd (maybe, 
just guessing) averages the 5-min values to appropriate information fitting 
into the pixel parameters. But anyway, graphs  ! are ! different if you don't 
keep the max or keep the max data.

Anyone tell me if I'm wrong.

Best regards,

Stephan

Am Dienstag, 4. Februar 2003 08:32 schrieb Ketil Oftedahl:
> Andrew,
>
> I think you can get by by using only ONE RRA.  If you sample tha data at
> 5 minute intervals and store every sample for the 2 year period there
> will be no need to store additional average/max values.
>
> >            RRA:AVERAGE:0.5:1:210240     \
>
> This will be the "raw" storage of all samples for 17520 hours (730 days)
>
> >            RRA:AVERAGE:0.5:6:700      \
>
> This will give you 30 minute averages for 350 hours
>
> >            RRA:AVERAGE:0.5:24:775     \
>
> ...and 2 hour averages for 1550 hours
>
> >            RRA:AVERAGE:0.5:288:797    \
>
> ...and 24 hour averages for 19128 hours (797 days)
>
> Only this last one will cover a longer period than the raw 5-minute step
> RRA.
> If you increase the 5-minute step RRA to cover 797 days (if that's what
> you need) you will only need that ONE RRA.
>
> If you store every sample for the required period you will be able to
> create both AVERAGE and MAX graphs for any period up to the total RRA
> storage period with any resolution up to the sample/storage interval.
> (Although a 2-year graph with 5-minute step size will be rather wide
> ;->)
>
> Creating MAX or MIN RRAs will only be required when you are using the
> consolidation functionality to store data lass often than the sample
> interval but still want to keep the MAX/MIN values.
>
> Rgds,
> Ketil
>
> Andrew Werbowy wrote:
> > So should I use MAX or not?

-- 
Stephan Harren
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