[rrd-users] Re: Merging .rrd files

[Alex van den Bogaerdt]

On Tue, Dec 31, 2002 at 10:28:12AM -0700, James-lists wrote:

> I have 2 T-1's which I was polling separately, each creating a separate .rrd file. They are now bonded together
> as an IMA group and I would like to merge the old data into the new .rrd file. Each .rrd file has a unique name.
> I cannot seem to find the rrd tool to do this, could someone point me to its name or a way to do this ?

No tool.  This is not a standard procedure.

How to do this (roll your own script):

1) Wait until both .rrd files are updated (so they're in sync as far
   as time is concerned)
2) dump both databases to xml
3) read each RRA, line by line, merge and write to the destination
4) restore the newly created xml file

The new file can be made in the following ways:

1) you could create a 3rd database with the right properties and
   dump this one just as you dump the other two.  Make sure the
   last update time is the same as the other 2 (so: it is in sync)
2) you could study an xml dump and create the new xml using the
   knowledge you gained
3) you could really edit one of the two xml files and restore from
   the edited file

Needless to say you need to be *very* careful when doing all this.

Try it out a few times before you do the definitive change, make
sure to have recent backups et cetera.

Good luck and happy newyear!
Alex
-- 
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