adding Consolidation Functions to existing RRDs

[sda99]

Hello all,

does somebody have or knows of a script, that would allow me to add new CF's to existing RRDs? One of my well used Data Profiles was created with only the AVG CF binded back in the day..

[TheWitness]

There are some functions in the latest Cacti lib/rrd.php that can do this. They were written by Gandalf back when he was more active (and not retired). However, they have never been tested. I brought them into the 1.0 release from the 0.9 release, but again, they've never been tested.

[sda99]

There are some functions in the latest Cacti lib/rrd.php that can do this. They were written by Gandalf back when he was more active (and not retired). However, they have never been tested. I brought them into the 1.0 release from the 0.9 release, but again, they've never been tested.

thank you TheWitness I will try to look into it.. funny enough I found the same question in a 2009 forum post about34251.html where you also hinted at a possible perl script - sadly you haven't linked it back then, you probably don't remember anymore haha

[TheWitness]

If it's more than a few days, then yes. This looks like the function: rrd_copy_rra. You have to load the dom using another function, and then figure out what to pass as the third parameter. This function though looks like it's taking an array of files and making changes. rrd_rra_clone. Some starters. Use 'test data' though. If you fiddle with it and find adding some more documentation is good. Do that in the develop branch inside the function documentation as pull requests. Thanks!

[sda99]

If it's more than a few days, then yes. This looks like the function: rrd_copy_rra. You have to load the dom using another function, and then figure out what to pass as the third parameter. This function though looks like it's taking an array of files and making changes. rrd_rra_clone. Some starters. Use 'test data' though. If you fiddle with it and find adding some more documentation is good. Do that in the develop branch inside the function documentation as pull requests. Thanks!

thank you very much, let me just say I have a lot more reading to do ._.

[sda99]

If it's more than a few days, then yes. This looks like the function: rrd_copy_rra. You have to load the dom using another function, and then figure out what to pass as the third parameter. This function though looks like it's taking an array of files and making changes. rrd_rra_clone. Some starters. Use 'test data' though. If you fiddle with it and find adding some more documentation is good. Do that in the develop branch inside the function documentation as pull requests. Thanks!

OK, I am also thinking about a different approach.. would it be possible to: backup all my current RRDs, then delete them from the default location - this would force all the RRDs to be recreated on the next poll (if my data source templates are at this point already mapped to the new Data Profile Preset - would the new RRDs be recreated with those new RRAs+CFs?), meaning all my graphs start flushed again; however could I then somehow use the backup RRDs in the same Cacti instance to only view my historic graphs somehow?

[Osiris]

You can do that, and then create a script to splice_rrd.php the resulting files. I think it should work.

[sda99]

You can do that, and then create a script to splice_rrd.php the resulting files. I think it should work.

oh so I could actually use splice to merge RRDs even with different RRA/CF structures?

[Osiris]

As long as the final is correct, yes. I think both additive and subtractive should work.