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

[Clay Jones]

Is it correct that the RRD would contain 1 year's worth of data points if I
specify an RRA with a yearly average?  Is keeping 1 year's work of 5 minute
data points the only way to generate a yearly average graph?

It's not a problem to do so, I just want to be clear on the implementation,

Thanks very much for your feedback.




On 2/12/02 2:42 PM, "Tobias Oetiker" <oetiker at ee.ethz.ch> wrote:
> 
> 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
> 







> 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?

>> 
>> Thanks,
>> 
>> Clay
>> 
>> 
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