[rrd-users] Re: Wanting an error instead of an "empty" graph

[Serge Maandag]

> Under what conditions would a graph containing no data be of value?

rrdtool is built to handle missing data.
whether it is before, after or during the time spanned by your rra's.
It just displays it as being NaN, which in my opinion is much better
than to generate errors and such. 

> if the timestamp of the last update of the rrd is 
> earlier then one week ago, then I know that I don't have the 
> data that I want.

Ah, I assumed you kept on updating the rrd with nans and you wanted to
find 
the last time a valid number was entered.

Serge.

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