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

[Braendle at medianet.freinet.de]

Hi there,

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?
e.g. 5 * 600  1 minute samples
     6 * 700 30 minute samples
     5 * 775  2 hour samples
     ...
or is it enough that I only multiply the first two values with 5

Any suggestions welcome

Thanks in advance for all your help

J. Braendle


>	Lets try to be compatible with MRTG: MRTG stores about the following
>	amount of data:
>	
>	
>	 600 5-minute samples:    2   days and 2 hours
>	 600 30-minute samples:  12.5 days
>	 600 2-hour samples:     50   days
>	 732 1-day samples:     732   days
>	
>	These ranges are appended so the total amount of data kept is 
>	approximately 797 days. RRDtool stores the data differently,
>	it doesn't start the ``weekly'' archive where the ``daily''
>	archive stopped.
>	For both archives the most recent data will be near ``now'' and
>	therefore we will need to keep more data than MRTG does!
>	
>	We will need:
>	
>	
>	 600 samples of 5 minutes  (2 days and 2 hours)
>	 700 samples of 30 minutes (2 days and 2 hours, plus 12.5 days)
>	 775 samples of 2 hours    (above + 50 days)
>	 797 samples of 1 day      (above + 732 days, rounded up to 797)



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