On Wed, Apr 25, 2007 at 07:08:02PM +0200, Christoph Schwabl wrote:
> Hello,
> 
> I get wrong (rounded) data with the rrdfetch command.

No, you do not.  At least not in your example (I'm sure some
rounding will occur, eventually, somewhere).

> Is this normal? What should I do to correct this problem?

You should RTFM http://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html
section on counter types.

Also see my site for some more information.

Delta_value is 54000000000 (because you say so!), delta_time is 900
(because of timestamps 1177498800 and 1177497900), thus the computed
rate is 54000000000/900 = 60000000 = 6.0e+07

HTH
-- 
Alex van den Bogaerdt
http://www.vandenbogaerdt.nl/rrdtool/

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