a) Use a current release. That would be 2.4.33. b) Delta-syncrepl supports MMR in current releases c) The reason I suggest delta-syncrepl is because syncrepl is known to be problematic, particularly with MMR. If you want reliable replication, use delta-syncrepl.
Is it recommended in MMR setups to use delta-syncrepl before syncrepl in general? Are there any disadvantages, like using more RAM, or other things to care..?
Thanks, Meike