[rrd-users] Aggregate/combine several RRDs

[Raimund Berger]

Alex van den Bogaerdt <alex at ergens.op.het.net> writes:

> On Fri, Jun 20, 2008 at 10:37:31PM +0200, Raimund Berger wrote:
>> "Raimund Berger" <raimund.berger at gmail.com> writes:
>> 
>> >> Creating another RRDfile isn't hard to do.  Filling it with numbers
>> >> isn't hard either.  The biggest challenge is to get your minimum and
>> >> maximum rates correct.
>> >
>> > And agreed, fetch and update via a script should not be too hard to
>> > accomplish.
>> 
>> Correction, not agreed. I forgot what I initially had in mind as being
>> the main obstacle to storage of computed intermediates, i.e. fetch
>> provoding no cdef.
>> 
>> While you can perform various computations on your input with graph
>> via cdef, I don't see a similar facility coming with fetch and/or
>> companions. So apparently, there's no way to stash those computed
>> results away in an RRD.
>
> Have you looked at rrdtool xport ?

That one looks better, thanks a lot.

Incidentally, and as I admittedly didn't look at those xml outputs
very closely yet, do you know if xport does write dump format, so it's
output can directly be fed into restore again?