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

[Serge Maandag]

> I've noticed that if the RRD does not contain any data for the span 
> requested, a graph will still be generated, but with no data (of 
> course.)

I'm glad it does.

> I'm wondering if it is somehow possible to have RRDs::graph 
> NOT create a graph, but instead, set RRDs::error

That would require a source hack, I think.

> I could do an RRDs::last on each RRD and check to see if it falls 
> within the span, but I'd rather not have to do the extra 
> operation if I can avoid it.

rrds::last wouldn't help you. I think you are looking for some kind of
rrds::first. You could do something like 
rrdtool fetch | grep -v nan | head -1 | etcetera to fetch the first
value.

Serge.

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