grewskee wrote: >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 >below. > >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 >RRAs?
Firstly, if you only store 5 minute sample periods, you cannot display data at 1 minute resolution. Even if you enter data every minute, it will be consolidated & normalised to 5 minute periods if you specify 300s as the step time. So, assuming you do want one minute resolution, you will need to set your step time to 60s. For 3 days you can probably get away without consolidation, so as a minimum you could probably get away with : RRA:AVERAGE:0.5:1:4320 That means, consolidate 1 step time (Primary Data Point, PDP) per Consolidated Data Point (CDP), and keep 4320 consolidated samples (60 minutes * 24 hours * 3 days). It doesn't matter which consolidation function you use since for one sample, min=avg=max. Alternatively, you could do : RRA:AVERAGE:0.5:1:60 RRA:MAX:0.5:1:60 RRA:AVERAGE:0.5:5:288 RRA:MAX:0.5:5:288 RRA:AVERAGE:0.5:30:144 RRA:MAX:0.5:30:144 That means: Consolidate 1 PDP per CDP and keep 60 value - that's one hour by one minute intervals. Consolidate 5 PDPs per CDP and keep 288 values - that's 5 minutes, and (60/5 * 24) values. Consolidate 30 PDPs per CDP and keep 144 values - that's 30 minutes, and (60/30 * 24 * 3) values. And for each of those, keep both an average and maximum value. In practice, I would keep more data than that. If you try and graph just a single data point beyond what you have stored, then you may find you pull data from a lower resolution consolidation - eg you may find that instead of getting an hour at 1 minute resolution, you get 5 minute chunks. -- Simon Hobson Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed author Gladys Hobson. Novels - poetry - short stories - ideal as Christmas stocking fillers. Some available as e-books. _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
