[rrd-users] Showing the average for a specific time period

Steve Shipway s.shipway at auckland.ac.nz
Tue May 10 00:13:52 CEST 2011

Sounds what you want is the Holt-Winters Aberrant Behaviour detection.

To get this, you need to define the normal pattern cycle (in this case, probably weekly)and define the special HW RRAs in the RRD file.  Read up on the HW support in the RRD documentation, as its far too complex to fully exlain here.


Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.shipway at auckland.ac.nz<mailto:s.shipway at auckland.ac.nz>
Ph: +64 9 373 7599 ext 86487

From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] on behalf of Michel de Lange [michel_de_lange at yahoo.co.uk]
Sent: Monday, 9 May 2011 8:21 p.m.
To: rrd-users at lists.oetiker.ch
Subject: [rrd-users] Showing the average for a specific time period

Dear experts,

I am monitoring the number of users of applications, and I want to show the actual number and the average number at that point in time. So I have my data every 10 minutes, and I want to show how the data for now compares with the data, which is normal (average), for example, for Monday at 10:20. How do I go about doing that?

I could create variables in the database for this peculiar average, and maintain it myself: Every time I write to the database, I recalculate this average. But I wonder whether RRDtool can do it for me?

With kind regards, and thank you for your attention,

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