[rrd-developers] problems graphing past end of RRD

Alex van den Bogaerdt alex at ergens.op.het.net
Tue Feb 26 11:41:31 CET 2008

On Mon, Feb 25, 2008 at 08:47:34AM -0800, Thorsten von Eicken wrote:

> > You are asking for data that is not yet there. You get as little of
> > it as possible. And if this means selecting the RRA at 4520 seconds
> > per bucket, then so be it.
> Suppose you're a sysadmin or a network admin. You're looking at the last 
> day graph of a device. Data for an hour because of a problem. What do 
> you expect to see? A graph that ends with the last data point (i.e. an 
> hour ago) leading you to believe that everything is fine unless you 
> carefully look at the X axis? Or a graph that ends "now" and shows the 
> data gap at the end of the graph? I have not seen any serious network 
> monitoring tool that shows the former, and I would refuse to use one, 
> actually.

I expect RRDtool to do as I ask, not to read my mind and do something
else which it thinks I would have wanted to ask instead.

My final comment on this:

The problem is not in rrdtool's code. The problem is in the parameters
it was given.

Alex van den Bogaerdt

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