Nagios Support Forum

For how long RRD files accumulate the performance data in Nagios ? Is the duration configurable?

This sounds more like an XI question, but yes it is configurable. To the extent that you can change the length of time to keep various times for check results, 1 day of 1 min checks or only 5 min of 1min check, on a per rrd file\check basis. The amount kept by default should be able to be gathered from running rrdtool on the individual rrd files.

I would take a look at this plugin:

http://exchange.nagios.org/directory/Ad ... IN/details

RRD files are automatically created when a host or service which returns perfdata is created. The file size is automatically determined based on the data it will be logging and as new data is logged, at a set period the old performance data is compressed down further and further to maintain the file size.