[rrd-users] Re: MAX doesn't work as expected: peaks are filtered

Alex van den Bogaerdt alex at ergens.op.het.net
Mon Aug 16 09:57:47 MEST 2004

On Sun, Aug 15, 2004 at 03:43:08PM +0200, Cristian Ghezzi wrote:

> It appears that all values inserted in the database within the last STEP 
> period are always averaged when creating a PDP, even when I'm going to 
> use the value in a MAX RRA, thus creating spurious values.

> This means that if I insert more than one value within a step, I will 
> not find the MAX of those values in the database, but an average value 
> which will always be lower than expected.

So, you are going to have "--step 1" and all is well.  Adjust your RRA
steps per CDP to your liking.

> - What happens is clearly wrong: the value of 500 inserted in the middle 
> of the previous STEP, which is an absolute maximum for the whole period, 
> has been smoothed down to 450.

This is not wrong.  This is expected behaviour. You can control this
process by adjusting step sizes and steps.

> Am I doing something wrong?

Nice order...
"rrdtool is wrong, rrdtool is bad, rrdtool sucks, Am I doing something wrong?"

I ask you to respect any "Reply-To" and "Mail-Follow-Up" headers.  If
you reply to me off-list, you'd better tell me you're doing so.  If
you don't, and if I reply to the list, that's your problem, not mine.

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