[rrd-users] Re: A beginners question

[Alex van den Bogaerdt]

Jason Fesler wrote:

> As to the performance..  I can *definately* say that each RRA adds that
> much more IO requirements.  I have 10 RRA's in most of my .rrd files.  I

Maybe you can trade in hard drive space for a performance gain.
This of course depends highly on the details of your setup, however
it is worth trying.

If you don't create graphs often, most of the current disk IO is wasted.
Also, if your graphs are not created with a resolution that is available
in one of the RRAs, current disk IO is wasted.

Maybe you can setup a test RRD with only one RRA.  If you use this
RRA to graph 400 days, rrdtool will need to consolidate 400 times
1440 CDPs into 400 pixels.  However, you currently are doing the same
spread out over time, even if you're not going to graph it.

cheers,
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