DRBD Reactor and diskless clients

Looking through the DRBD 9 docs there are two features that I’m interested to experiment with more, DRBD Reactor and diskless clients.

Whilst both are reasonably well explained as independent entities in the docs, there is no coverage or examples of how they could interact with each other. In particular, of course any gotcha’s to be aware of.

Can anyone share some real-world experiences / examples ?