[rrd-users] Re: How many samples do I really need in my rrd datafile

Clifton Royston cliftonr at lava.net
Thu Feb 22 22:02:00 MET 2001

On Wed, Feb 21, 2001 at 02:29:46PM +0100, Braendle at medianet.freinet.de wrote:
> I have a little problem  with rrdtool that makes me crazy:
> I've read all manual I've found and the only thing 
> which may help me was something under the following URL
> http://ee-staff.ethz.ch/~oetiker/webtools/rrdtool/tutorial/rrdtutorial.html
> at the end of this mail.
> Here is my Problem:
> I want to use 60 second instead of 300 seconds between my samples.
> Do I have to store 5 times the amount of data to get the same
> results (graphs) via rrdcgi?

It depends - do you want to *store* a sample every 60 seconds, or do
you just want to *take* a sample every 60 seconds?  You can take a
sample every 60 seconds with the initially defined RRD, and RRDtool
will just accumulate 5 of them into 1 5-minute sample.

If you want to keep 1 minute samples, then decide how many you want to
keep, and insert that RRA at the beginning of the example RRD
definition.  (Don't replace the others, just add that one first.)
RRDtool will then keep those values, while continuing to also compute
the values into the other RRAs for longer time intervals.

  -- Clifton

 Clifton Royston  --  LavaNet Systems Architect --  cliftonr at lava.net
                  "WWJD?  JWRTFM!" - Scott Dorsey (kludge)

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