[rrd-users] Questions of new user
linux at thehobsons.co.uk
Sun Dec 6 12:40:08 CET 2009
Alex van den Bogaerdt wrote:
> >>if you update more often than required for you step size, the data will be
>>>aggregated using the aggregation function you've chosen (MIN, MAX,
>>>so either the smallest or the highest or the average of the values
>>>will be stored.
>> No, the aggregation functions are NOT used for sub-step updates.
>> See Alex's tutorial on rates and normalising - it's all explained well
> > http://www.vandenbogaerdt.nl/rrdtool/
>Actually I did not really describe sub-interval updates. And I don't know
>from the top of my head. I'd have to look in the sources to see what really
>happens when you do that.
Well it's "sort of" in there, but not really highlighted. If you
update every second with a step size of 60, then you can feed in one
value of 60 and 59 values of 0 - and get the result of 1/second for
the step. Min. Max, etc only come in when consolidating PDPs.
That's what I've observed anyway.
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