[rrd-users] Re: removing rra's

[Alex van den Bogaerdt]

Bjorn Nordbo wrote:

> The idea was to:
> 
> - store four weeks of 5 minute samples
> - store two months of 2 hour samples
> - store three years of 1 day samples
> - store max values for every 2 hours 2 months back
> - store max values for every 2 days 3 years back

Of course you mean: the idea is to be able to view ... [etcetera]

Always keep your graph (or fetch) goals in mind when generating
the database.

> Is this definition a bad idea? Should I add RRA's to match the most
> commonly used presentation intervals? Do you have any idea on how
> much impact this has on graphing time?

I don't know how much impact it has.  I never did formal testing
of it, perhaps others did and are willing to share the information?

> > If you like you can write an application that does the proper
> > magic.  Every now and then this (kind of) question pops up but
> > I think the dump and restore exercise is good enough for the
> > occasional change needed.
> 
> I think I'll write something. Updating 10000 RRD's manually isn't
> exactly the way I want to spend the rest of 2001. :-)

<g>  

It shouldn't be hard to write something that can actually be a part
of rrdtool. I mean, if you're going to design something anyway you
could have others benefit from it too.

I do not claim it is good code but have a look at rrd_resize.c for
a start.  Just use it as a template for your own program, or extend
the existing program.

cheers,
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