OpenNMS is using by default the Java project of an implementation of RRDtool called JRobin. It is also possible to use OpenNMS with Tobi Oetikers RRDtool. During time the feature set of JRobin and RRDtool differ. User which want to use latest features of RRDtool can switch OpenNMS easily to use RRDtool instead of JRobin. The drawback is loosing all history of collected performance data. To avoid this problem and helping people moving from JRobin to RRDtool it should be possible to easily migrate JRobin files to RRDtool format.