[rrd-users] Using a single RRD vs. a separate file for each data series

Tobias Oetiker tobi at oetiker.ch
Thu Sep 11 21:49:26 CEST 2008

Hi Sean,

> I understand that using a single RRD requires all values to be written
> simultaneously, but I don't see any obvious advantage to having a single
> RRD. Is it done to improve CPU or storage efficiency?

yes, updateing a single rrd with 10 DS is almost as fast as
updateing one with 1 DS ...

> Are there any problems that I might run into if I use separate RRDs - for
> example, operations involving multiple series that I won't be able to do?

if you can, performance whise I would only keep DSes in a single
RRD if they are right group which will not change (lois&clark,
thelma&louise, ....)


Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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