Ah, I don't have RA rh5-->dr-rh1.
So, I could setup a RA from all multimaster to dr-rh1 to avoid this kind of problems.
I'm not sure to understand. Really, I have a real time RA from rh5 to rh1, and from
rh1 to rh5. So, if I initialize rh1 from rh5, rh1 should still replicates to dr-rh1,
because rh5 is always in synch with rh1...