Thanks, interesting.. > > "step" - specifically what happens if values are fed in more often? > Step is the size of each bin in the database - ie the length of each > time slot for which it can store data. Anything you feed it more > often that the step time is accumulated until the period is complete > and then it's all used to work out the single value stored for that > bin. > > Eg, if you feed in values of 0,0,5,0,0 which all fit within one step > time, then the min, max, and average are all 1. This is a surprise! It would certainly appear at first glance that the max/min were 5 & 1. > > Alex has some excellent tutorials at > http://www.vandenbogaerdt.nl/rrdtool/ - they explain a lot. I'll certainly go there now, thanks.
> >2) Can I change step after the database is created? > > - I setup one value for daily step size, but now want to do twice-daily > > updates. > > - Can I change step size, and just start inserting updates more often? > > Don't think so. I think you have to dump the data then do one of two things : > 1) create a new database and feed the old data in > 2) edit the data and re-import it My data comes from a live feed source, is there any standard way to export from rrd in a manner that allows re-import? I suppose one could write something that would do fetches from the old, and updates into the new. > You cannot go backwards in time. So to put historical data in, you > must doing before putting current data in. Ah; so update can be backwards in time, (negative time), but all inserts must be in a forward sequence. (Seems like these things should be in the main documentation and tutorial.) _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
