[rrd-users] Re: Graphing Mail Delivery Time

[Alex van den Bogaerdt]

Dan McGinn-Combs wrote:

> The delivery time is asynchronous. That is, I can't go to the mail server
> and read a counter. I have to wait until the mail shows up and then check
> its headers to get the elapsed time. I was hoping to graph specific areas of
> the world in a single .gif image (such as Brussels, Paris, Munich and
> Rotterdam).

That should be possible.  You need to think of how you handle multiple
emails that come in simultaniously.  If mail is transfered during the
interval t1->t2, do you log the time at t1 or t2, or do you log the
amount of messages in transfer during the interval. These three options
are completely different from each other and so will be your front end.

> But I can't count on the mail from all of them being available every time I
> check the inbox. So it appears my goal of having a DS for each one of them
> in the same RRD is not achievable. In other words, can I update the same RRD
> as follows:
> 
> rrdtool update europe.rrd --template Paris 989009000:<elapsedtime>
> rrdtool update europe.rrd --template Munich 989009000:<elapsedtime>

maybe so, I don't know what happens when you skip DSes.

> Failing that, is it reasonable to then graph information from multiple RRD's
> so that these locations can still be on the same graphic?

That would be better in any case.  What if you add another city?
In rrdtool graph you can specify a DEF per city, coming from a RRD per
city, no problem. Another city would mean another RRD.

cheers
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