In infinite wisdom Philip Frank ich@philipfrank.de wrote:
Data collection: In the past, I used rrdtool to collect stats on a server. Its datastore has a limited size - over time old entries get merged together and the data gets thinner, but is never completely deleted. Unfortunately, it is not very portable.
The size of the RRD file does not increase over time. THat is a feature, not a bug :-) . Merging of the older data (reducing the granularity) is a side effect of this. In my opinion, the way RRD handles that is quite intelligent. It would be hard to get that functionality right using mysql and rollup tables.
Why do you say that RRDs are not portable? I have seen them work on bsd/linux (and on 32/64 bit).