I have multiple opennms installation on different file systems which access the same postgresql 9.6 database for opennms. The accesses are never concurrent.

Unfortunately, each installation displays only the data it has collected, instead of displaying all the data collected by all installations. This leads to "holes" in the graphs.

I have tried to make all /etc/opennms folders contents match, but it did not solve it.

Isn't there a way to overcome this? 

Maybe the latest opennms version supports this.