[rrd-users] Re: Increasing One Year RRD Database to Two Years

[Alex van den Bogaerdt]

Brian E. Seppanen wrote:
> 
> 
> Is it possible to take an existing rrd database that stores data with a 
> one year limit and expand it to a two year limit?    Will this impact the 

You can.  "rrdtool resize".  This command will generate a *new* database
which you should check and when found to be all right you can move the new
one over the old.

> data within the database?   Has anyone done this to a large number of RRD 
> databases, are there any caveats?  

No, not for large amounts.  One caveat that I know of is that you may
update the old database while you're checking the new one.  This means
you can loose one update or so.

Checking the database may not be necessary.  When I implemented the
command I expected feedback.  Apart from the confusion generated by
the creation of the new database I never heard of any problems.

HTH
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