[rrd-users] Re: RRD general info about length of storage

[Tobias Oetiker]

Today Clay Jones wrote:

>
> I'm new to RRD, and I've only been able to infer the following assumptions
> from the documentation:
>
> 1.  RRD will store data until it is rolled-up or archived in a RRA.  I.E. If
> not specified with 'max', there is no limit to the number of data points to
> be stored aside from the RRA specification.
>
> 2.  If there are multiple RRAs, RRD will store the data for the "longest"
> RRA.
>
> I'd like to confirm these assumptions.  Here's an example:
>
> I store CPU% every 5 minutes, and I want a weekly, monthly, and yearly
> average, min, and max graphs.
>
> Weekly = 12/hour * 168 hours/week = 2016 Data points per week
> RRA = only 1 point stored each for average, min, max, etc.
>
> Are the monthly and yearly RRA's calculated off of the weekly avergages, or
> does the RRD keep data for up to 1 year?  For example:
>
> Year = 12/hour * 8760 hours/year = 105,120 total Data points stored in RRD
> per year
> RRA = only 1 point stored for yearly average, min, max, etc.
>
> Are these numbers an accurate representation of how the data is stored?

nope, the RRAs are independent, data for each RRA comes direct from
the data you enter ... each RRA has its own 'holdingarea' where
data is prepared to enter the RRA

tobi
>
> Thanks,
>
> Clay
>
>
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