[rrd-users] Increase RRA Size

[Tobias Oetiker]

Hi Guy,

Yesterday Bigras, Guy wrote:

> Hi there,
>
> I'd like to add a new RRA to the RRD file.  Can't figure out how to do it.
>
> Here's some background information:
>
> I'm using Cacti 0.8.7e with rrdtool verion 1.3.8-1.
>
> I've setup my RRDs to use four custom RRAs instead of the default
> ones.  The major difference is that there is no data point
> averaging being done. Here is my RRA setup (5 minute polling
> interval):
>
> RRA1: Daily
> Consolidation: average
> steps: 1
> rows: 300
> Timespan: 86400
>
> RRA2: Weekly
> Consolidation: average
> steps: 1
> rows: 2304
> Timespan: 604800
>
> RRA3: Monthly
> Consolidation: average
> steps: 1
> rows: 9216
> Timespan: 2592000
>
> RRA4: Yearly
> Consolidation: average
> steps: 1
> rows: 109440
> Timespan: 31536000
>
> The reason there is no averaging is because the powers from above
> do not want to loose any data point.  They want to be able to
> zoom into any "peak" on the graph and be able to look at the real
> data as opposed to an average.
>
> However now they want to be able to keep more than a year's
> worth.  Hard drive space is not an issue so I've opted for a ten
> year RRA.  I just don't know how to modify an existing RRD file
> to incorporate these changes.  I've tried some scripts to export
> data and import back but it doesn't seem to work.
>
> thanks in advance for your help
> Guy

two things ...

a) you missunderstood the RRA concept ... if you want to keep hires
   data, you should just make the RRA1 very long ... but still have
   some lower resolution RRAs (maybe of the same length) as they will
   provide performance benefits when generating graphs over long
   periodes of time.

b) there is rrdtool resize for resising RRAs ... although there
   might be 'odd' side effects as the newly created space will be
   empty ...

cheers
tobi


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-- 
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