[rrd-users] Re: Using update to insert legacy values into an existing RRD archive?

Leif Neland leif at neland.dk
Tue Jan 9 18:36:46 MET 2007

Rob Newman wrote:
> Hi there,
> I am continuously monitoring a whole series of variables with RRD,
> and this is working happily. I have old primary data points (time
> stamp and value) that I wish to add to these existing RRD archives.
> Is there anything I should be aware of when I do this? The archives
> are currently being updated every twenty seconds with new PDP's, so I
> am concerned about clashes. Is this a needless worry?

You can not go backwards in time, i.e. you can not enter any data which is 
older than the latest entered.

So you must create a new RRD, first fill it with the old datapoints, then 
extract values from the current RRD, and enter into the new RRD. Finally 
swap the old and new RRD.
And you must do most of it in a 20 second window between updates.

Good luck :-)


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