Les, On Sep 10, 2013, at 1:43 PM, Les Mikesell <lesmikes...@gmail.com> wrote:
> Thanks - what is the current state of the art in terms of slicing and > dicing jrb/rrd data? Besides this issue, there have been times when I > would have liked to back-fill some history or fill in some gaps with > data from a different opennms instance. With JRobin is possible to do that (of course in Java) because JRobin is not an exact copy of the RRDtool behavior. The RRDtool behavior is: you can't update any old datapoints. If you insert a datapoint at X seconds, RRDtool is going to accept data only at X + 1 (in seconds). So in order to "merge" the data, the solution is completely different if you are using JRobin or RRDtool. With JRobin, the "merge" operation can run simultaneously with OpenNMS. But, with RRDtool, OpenNMS must be stopped while doing this because of how RRDtool behaves when updating the .rrds. With RRDTool, a merge means that you must dump the content as XML, update the data as XML and then re-create a new RRD based on the updated XML. Alejandro.
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