Which DRBD versions can talk to each other?

Which DRBD versions will connect and sync between each other.

Please note that we not extensively test or suggest that anyone run mis-matched DRBD between nodes for any extended period of time. We facilitate some backwards compatibility only to allow for a "rolling upgrades.

8.4 can talk to 9.0
9.0 can talk to 9.1

9.1 can not talk to 8.4.

- Edited by DJV 2020-12-14