I'm guessing that you have a 300MB RRD file with thousands of rows in the RRAs, and are hoping to only backup the portions of it that have altered, in much the same way that an Oracle RMAN backup only backs up altered records.
As far as I know there is no easy way to do this. All databases suffer from this; try backing up only the changed portions of a large mysql table, for example. You could write a custom daily script to dump the day's high-resolution data (via rrdtool fetch) to an export file and backup that, though restore would be a pain in the neck. At least you'd not have to back up the lower-resolution RRAs as their contents could be deduced from the high-resolution data, if you keep it going back far enough. The way we achieve this for MRTG/RRD is to have a much smaller (800 row) RRD that backs up completely daily and then rotates. The frontend allows us to select archived versions of the RRD to view historical data, though this is not as convenient as having it all in one 10,000 row RRD of course. Another way is to run your updates through the trunk version of rrdcached, and use the pause/resume function to quiesce writing while you snapshot the filesystem. Then, you can backup the snapshot (though you're still backing up the full amount of data). However this at least ensures you have consistent backups with structural integrity. 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 ccddtt Sent: Monday, 16 July 2012 9:08 p.m. To: rrd-users Subject: [rrd-users] Incremental backup rrd file hi,rrd-users! I had some rrd files more than 300M,need bakup to remote server every day. I use VPN access the remote server,the link is very slow. who can tell me how to incremental backup the rrd file ? i think maybe like this:i can back that day rrd data(not need other day),and put to remote server,and iput the bak data to rrd file. thanks very much! _____ 2012-07-16
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