This is very awkward to do. You'd need to dump the RRD to XML, modify the XML, then reload it to make a new RRD file with the different step size.
Your 5-min 1-sample RRAs would need to be changed to 5-min 5-sample, and similarly for the larger RRAs. You'd likely also need to create a new 1-min 1-sample RRA, 3 months long, and initially populate it with data pulled from the 5-min RRA. This would be possible, but (a) you wouldn't have the data granularity for historical data, and if you miss out the initial copy of data from the original 5min RRA to the new 1min RRA you'd get odd behaviour, and (b) you would need to write a fairly complex program to process the XML, as no existing utility I know about can do this. Steve _____ Steve Shipway ITS Unix Services Design Lead University of Auckland, New Zealand Floor 1, 58 Symonds Street, Auckland Phone: +64 (0)9 3737599 ext 86487 DDI: +64 (0)9 924 6487 Mobile: +64 (0)21 753 189 Email: <mailto:s.ship...@auckland.ac.nz> s.ship...@auckland.ac.nz P Please consider the environment before printing this e-mail From: rrd-users-bounces+s.shipway=auckland.ac...@lists.oetiker.ch [mailto:rrd-users-bounces+s.shipway=auckland.ac...@lists.oetiker.ch] On Behalf Of Brent Barr Sent: Thursday, 12 April 2012 6:38 a.m. To: rrd-users@lists.oetiker.ch Subject: [rrd-users] Changing data collection rate in an existing file I have over a year of data for my systems at a 5 minute sample rate. I'd like to change to collecting data every minute, but would rather not end up with new rrd files where I have a before/after problem when I'm charting data. My problem is that if I am collecting data every minute, I want to collect and store 5x the data too so I still have the high accuracy data for three months. So I can't just change the step size in the .xml dump and restore it, I think I'd have to make some serious changes to the database file too. Or is there a way to move data from one file to another? I have another rrd setup with the correct step and enough locations for the faster collection rate. Can I grab the data from the old file and drop it in the new one somehow? Maybe using the fetch and update commands and a loop? Thanks for any help-
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