[rrd-users] Re: A doubt on RRD database

Serge Maandag serge.maandag at staff.zeelandnet.nl
Wed Jan 26 15:47:56 MET 2005

> So RRD is a FIFO. Is this a file-based DB?


> 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.


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