I get the picture. :-)
If I would define a time period of 5 months, after the 5th month, time
would be continuously shifted after each data collected value, overwritting
old data from the begining, never increasing past the defined size for the
5 month data, correct?

BTW, thanks Serge for the explanation.

Cheers


> > So RRD is a FIFO. Is this a file-based DB?
> 
> Yes.
> 
> > Looked at the docs and it says that we can define the 
> > database size at creation time. By this, if I define a size 
> > for x samples during a month, then after a month, the saved 
> > data will be overwritten with new collected data for the 
> > following month. In this situation how can I analize the flow 
> > for, e. g., 5 months?
> > 
> 
> 
> Well it's a FIFO, so everytime a value is added the oldest value
> Gets shifted out.
> 
> say your RRA holds 5 minute samples for a month, starts at 
> 2000-01-01 00:00:00 and ends at 2000-01-31 23:55:00.
> 
> Then after an update on 2000-02-01 00:00:00, the RRA will start at
> 2000-01-01 00:05:00 and end at 2000-02-01 00:00:00.
> 
> And this is valid for every RRA.
> 
> Serge.
> 
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