[rrd-users] Re: DERIVE - basic question

[Alex van den Bogaerdt]

On Wed, Feb 04, 2004 at 09:21:33AM -0500, Bill Z. wrote:

> rrdtool create nsm1.rrd     \
>   --start 1075810000        \
>   DS:events:COUNTER:600:U:U \
>   RRA:AVERAGE:0.5:1:105120
> 
> rrdtool create nsm2.rrd     \
>   --start 1075856400        \
>   DS:eventd:DERIVE:600:U:U  \
>   RRA:AVERAGE:0.5:1:105120

> However, the 2 graphs look the same -- as a matter of fact, the 2 DBs are
> exactly the same!  Why??

This means your counters have not
a) gone backward
b) wrapped

Starting from 10: 20,30,20 is processed:
counter -> increase 10, increase 10, increase 2^32-10
derive  -> increase 10, increase 10, decrease 10

Having zero as the minimum, that derive would look like:
increase 10, increase 10, unknown (discarded)

HTH
Alex
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