CODEWITHSUNDEEP
rrdtoolrrdcacti
takobaba
takobaba

Reputation: 315

Updating values in an existing RRD file

I have an rrd file working fine under cacti, drawing a graph for me for more than a year from one data source.

Today, I discovered that the data in the rrd file is not correct. I have corrected the data source and fixed problem for the future. However, I need to divide the previous data by 2 to correct it historically as well.

Is it possible to update the values of an rrd file? If yes, how can I achieve this?

Upvotes: 0

Views: 3165

Answers (1)

Steve Shipway
Steve Shipway

Reputation: 4027

Data in the RRAs cannot be directly changed once written.

However, what you can do is to dump the data to XML (using rrdtool dump); edit it using some other method; and then reload the data into a new RRD file (using rrdtool restore). This, of course, requires you to create some method to automatically modify the values in the XML file, but this should be simpler than trying to modify the RRD directly.

Upvotes: 1

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