[rrd-users] Re: resize question

Alex van den Bogaerdt alex at ergens.op.het.net
Fri Dec 10 14:26:10 MET 2004

On Fri, Dec 10, 2004 at 02:06:08PM +0100, Robin Elfrink wrote:

> >what does
> >"rrdtool fetch your.rrd AVERAGE --start end-30d --end 12:00 | wc -l"
> >report?
> >
> >And what about:
> >"rrdtool fetch your.rrd AVERAGE --start end-30d --end now | wc -l"
> >?
> bash-2.05b# rrdtool fetch resize.rrd AVERAGE --start end-30d --end 12:00 
> | wc -l
>     1443

This used the 30-minute RRA.

30 days, 24 hours a day, 2 intervals per hour.  Add a couple of
header lines and you get 1443.

> bash-2.05b# rrdtool fetch resize.rrd AVERAGE --start end-30d --end now | 
> wc -l
>     1444

This is strange.  I would expect to see more lines.
Hmmm... never mind, it is not important.

rrdtool fetch is certainly capable to fetch data from the 30-minute RRA,
so rrdtool graph should be able to do this as well.

Repeat the debugging process but now with rrdtool graph.

A simple graph, just one DS, will probably be enough.
(some adjustment may be needed, such as the DS name).

rrdtool graph picture1.png --start end-30d \
	--end 12:00 DEF:a=resize.rrd:ds0:AVERAGE LINE1:a#FF0000

and of course

rrdtool graph picture2.png --start end-30d \
	DEF:a=resize.rrd:ds0:AVERAGE LINE1:a#FF0000

If the first picture does not produce normal results,
add in "-r 1800" and retry.  This shouldn't help for
the 2nd picture.


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