[rrd-users] Questions of new user

Simon Hobson 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,
>>>AVERAGE etc)
>>>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
>>  there.
>  > 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.

Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

More information about the rrd-users mailing list