[rrd-users] Insert OLD data into RRD files

[Andy Riebs]

Alexander,

It's still true that it's difficult to load "old" data, though this is
actually desirable in large monitoring operations where an invalid
timestamp could skew all manner of results.

For an occasional back-dated update, the easiest thing to do is 
     1. Dump the database
     2. Edit the dump file by hand, duplicating a valid XML stanza from
        immediately before or after the desired update time, and
        updating it with the missing data, in chronological sequence
     3. Restore the database

HTH!
Andy

On Thu, 2009-06-18 at 11:41 +0000, Alexander Skwar wrote:
> Hello!
> 
> Is there a way to insert OLD data into RRD files? I tried:
> 
> $ rrdtool updatev 269.rrd 1241121600:852
> return_value = -1
> ERROR: 269.rrd: illegal attempt to update using time 1241121600 when
> last update time is 1245323161 (minimum one second step)
> 
> Searching the lists, I found a post from 2003
> http://osdir.com/ml/db.rrdtool.user/2003-01/msg00128.html
> which says, that it's not possible to load old data.
> 
> Is that still true?
> 
> What would I need to do, to get old data into my RRD file(s)?
> 
> - Dump contents
> - Create empty new RRD file
> - Load data, INCLUDING old data and dumped content
> 
> Would that be the correct approach?
> 
> The RRD files have been created by Cacti and I don't have
> the slightest clue HOW they were created. Given the following
> rrdtool dumped XML file (where I removed ALL the values
> in the <database> sections), what would be the command
> to recreate the RRD file?
> 
> http://files.getdropbox.com/u/135660/Cacti/269.rrd.blank.xml
> 
> Thanks a lot,
> 
> Alexander
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Andy Riebs,   HP Scalable Computing and Infrastructure / Catalysts
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