[rrd-developers] Re: Idea for RRDtool 1.1.x: Database

[Alex van den Bogaerdt]

gbrandt at pcibuf.com wrote:
> 
> I would like to add to this thought.  We are tracking many devices on our
> network, and also want a way of looking at historical data.  We are currently
> using a script to generate the html page, and images, and then copy the images
> to an archive directory.  Kludgey, but it works.  The ability to tie in a back
> end database, and then generate the graphs for current and some past time period
> would be great!.  Especially when viewed on the same page.

Or, even better, plot in the same graph.  Month by month comparison.
There has been a brief discussion on this between me and Tobi and
it seems to be a nice feature.

However, it's going to be difficult to always do it right. For instance,
februari doesn't always have 28 days. Comparing the current month with
the previous month will also be a pain.  However, comparing week 1 in
2000 with week 1 in 2001 shouldn't be a problem and neither would it
be difficult to compare 4 weeks at a time.

Any thoughts on this?

P.S.
For your specific problem, have you considered using the current
features of RRDtool? For instance, use the "yearly" RRA to go back
anywhere from now to now-2years? Or, extend the size of an RRA and
use more than the MRTG-compatible time periods?

"rrdtool graph file.png --start end-4w --end now-1year"
This may prove to be enough for your needs so if you haven't tried
this yet, for instance because you don't know about it, I recommend
to read the tutorial.

cheers,
Alex

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