When I say tune, I mean utilizing rrdtune and rrdresize to affect changes to the RRD file. I suspected the file was fixed, but wanted a little bit more assurance. Thanks for the response.
On 6/19/2014 10:59 AM, Simon Hobson wrote: > Kevin Stewart <[email protected]> wrote: > >> Once an RRD is created, as points are added, will the file grow over >> time? Or does the file stay the same size (given that is is not tuned)? > As Pablo says, they are pre-allocated and stay the same size - that size is > known because you define all the DSs (data series), consolidations, and > retention periods (ie number of consolidated data points to keep) when you > create the file. Internally it is as the name says, a round robin. Each > consolidated data set is defined by a single list of values - plus a pointer > to the current "start/end". As new data comes in, it simply over-writes the > oldest data and the pointer moved on - when the pointer gets to the end, it > wraps around to the beginning. So nothing is "added" or "removed" - only > updated in-place. > > However I'm not sure what you mean by "not tuned" - because RRD files are > actually quite highly tuned for a specific purpose, that of efficiently > storing/extracting/graphing predefined sets of data as above. > > As a bit of trivia, RRD Tools came out of the MRTG project - a set of tools > to collect, consolidate, and graph interface traffic rates for routers (hence > Multi Router Traffic Grapher). > > _______________________________________________ > rrd-users mailing list > [email protected] > https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
