[rrd-users] Re: fetch?

[Alex van den Bogaerdt]

Steven S. Dick wrote:
> 
> On Thu, Sep 07, 2000 at 11:37:57AM +0200, Alex van den Bogaerdt wrote:
> > > I'm totally confused about rrdfetch.
> > 
> > Don't remember for sure but I think there's something in the tutorial.
> 
> Unless I looked in the wrong tutorial, there isn't very much.

That's correct, it isn't much.

> > What is it that you want to know?
> 
> I think I've figured out the main parts (by trial and error), but I'm
> still unable to get -resolution to do anything useful.

One problem that I've seen often is that a request is made for data
that isn't there.  For instance, an RRA stores 1-hour samples and you
ask this resolution without specifying an end-time.  Assume that you
ask for data "--start end-4h" at, say, 16:25.  This means that you try
to fetch "--start 12:25 --end 16:25" with a resolution of one hour.
However, there is no data *in the 1-hour RRA* for time period 16:00-16:25.
This can't be done, what can be done is to fetch that data from another
RRA which stores samples every minute.  Result: you get the data with
a resolution of one minute.

HTH
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