[rrd-users] Re: Migrating data from one RRA to another one

Alex van den Bogaerdt alex at ergens.op.het.net
Tue May 4 21:29:36 MEST 2004

On Tue, May 04, 2004 at 09:29:49AM +0200, Gerhard Strangar wrote:
> > > update to insert the data. But how do a read from the RRA? I don't think
> > > using rrdtool dump and applying sed to the XML file is a good idea.
> > > Any suggestions?
> > 1: why not?
> It's quite a lot of work to get the XML file to raw data again.

It will take some time, sure.

> > 2: use rrdtool fetch perhaps?
> Okay, this could work. But I forgot something: I store MIN and MAX
> values, too. But there's no way to tell rrdtool update to insert

It is a bit of an hack:

1: create three new databases, DS type gauge
2: insert the numbers, min,avg,max each in their own database
3: dump the databases
4: merge the xml files
5: restore one database
6: use rrdtool tune to alter the DS type (if necessary)

And if this isn't possible for whatever reason: With the combination of
MIN,AVG,MAX and the new interval duration it should be possible to compute
two or three updates per interval which will produce the desired result.

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