[rrd-users] retrieving lower level information from defined higher level archieves

Steve Shipway s.shipway at auckland.ac.nz
Mon Nov 29 02:35:44 CET 2010

Short answer is no - RRDTool is good, but it  is not psychic.  It cannot create information out of thin air!  If you have only supplied per-hour data, then it cannot provide accurate per-minute data.  If you ask for per-minute data, it will give you the best it can - even if this means a single per-hour sample.

What you *can* do, is to request a graph for a small time window, and the best data available will be used.  This might result in a very blocky graph if the required and available intervals differ greatly!

For 'fetch' and 'graph', RRDTool always attempts to do the best it can using the available data.  If you haven't given it adequate data, you won't get a very good result, as with any system.


Steve Shipway
ITS Unix Services Design Lead
University of Auckland, New Zealand
Floor 1, 58 Symonds Street, Auckland
Phone: +64 (0)9 3737599 ext 86487
DDI: +64 (0)9 924 6487
Mobile: +64 (0)21 753 189
Email: s.shipway at auckland.ac.nz<mailto:s.shipway at auckland.ac.nz>
P Please consider the environment before printing this e-mail

From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [mailto:rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] On Behalf Of josh joshua
Sent: Monday, 29 November 2010 5:05 a.m.
To: rrd-users at lists.oetiker.ch
Subject: [rrd-users] retrieving lower level information from defined higher level archieves


I have rrd file with weather day captured  per day, per month. Suppose I want to find out weather condition for minute, is it possible to do that from given rrd graph?

To be precise, currently my RRD file has RRA defined for  per day , per month. Without adding new RRA which corresponds to per hour or per minute, can I retrieve data using currently available information (per month, per day) ?

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