To resolve the stuck Join state follow the following steps.
1. Go to the server that holds the master of the partition being merged.
2. Load DSREPAIR on the server holding the master of the parent partition then select Advanced Options| Replica Partition Operations, click on the partition and then do a Cancel partition operation. This will put the parent back into an on state.
3. Give it a few minutes to sync out. The child partition will also go back to an on state.
4. Make sure that the server that no longer exists in the tree has been removed from the tree. (In NDSMANAGER delete the server object and in NWADMIN delete the volume objects of the server that no longer exists.
5. Run timesync status, and report sync status in DSREPAIR and resolve any errors within the partitions. This includes the child partition that is too me merged as well as the parent partition. (Load DSREPAIR | time synchronization or report synchronization status.)
6. If Everything appears clean then re-do the merge operation.
Если не понятно, могу перевести.