[rrd-users] creating a rrd database with specific RRAs

grewskee mmcgrew at gmail.com
Tue Aug 10 21:15:43 CEST 2010


I have read the documentation several times as well as several examples
given out on the internet, and I am still having a hard time understanding
the formulas for creating the RRAs in a RRD db.

I have the following scenario, and am wondering if/how I could do this:

1. End goal is to graph the memory usage for a machine (free, cached, etc). 
I understand how to create the DS's.  I am using a step of 5 minutes (300
seconds).  I only want to store a maximum of 3 days worth of data, as shown

2. I would like to have graphs for:

Hourly (1 minute average)
Daily (5 minute average)
3 days (30 minute average)

3. For each of the above, I would also like to have the ability to determine
the MAX value as well.

Can anyone attempt to explain the formula needed to convert the above into

Thanks in advance.
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