[rrd-users] Re: Bug with "MAX" RRA ?
Alex van den Bogaerdt
alex at ergens.op.het.net
Tue Dec 30 15:54:25 MET 2003
On Tue, Dec 30, 2003 at 02:58:48PM +0100, Paul Courbis wrote:
> I'm trying to setup an RRD database to kkep a track f "MAX" values of a
> counter. My problem is that the values are transformed depending on the
> timeslot alignement. That is, if I setup a RRD database receiving a data
> every minute, the value is used unchanged if it's store on the beginning
> of the minute, while it is transformed (average with previous value) if
> it's entered some second laters.
That's the normalization process kicking in.
> here's a little shell script that produces 2 curves, one with data
> stored on the beginning of a minute, the other 30 second laters. As I
> keep "MAX" values, curves should be the same (in my mind at least) but
> it's not the case.... Run this script, it'll create a "demo.gif" graph
> showing the problem.
MAX has to do with RRA. Rates are going to the RRA _after_ normalizing
Try your script after changing the following:
- change "step" from 60 to 1
- for each RRA, multiply the pdp_per_cdp value by 60
1*60 == 60*1 ,
normalizing 1 second is different from normalizing 60 seconds)
> If anyone can explain...
I did, countless times. Please find them on the web, archives, google
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