[rrd-users] Re: Give an inch...They take a mile...

[Alex van den Bogaerdt]

Schroeder, Dennis wrote:

> Ok, now for my first question.  If I attempt to update an RRD with a time
> that already exists in the database, will it overwrite the first value or
> ignore the new value because one already exists?

You'll get an error message saying that you cannot update because it is
before the last update time.

However, if you have two separate RRD files, you can create one graph from
two sources.  The two RRD files can have different last-update-times.

> If I can update an existing entry in the database, then what I'm trying to
> accomplish will be possible and there will likely be more questions.  If RRD
> won't update an existing value, I'm dead in the water.

Modifying an existing entry is not possible.  Rebuilding a database
from scratch is (provided of course the input data is still available).

cheers,
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