hana studio may hang when you have system replication setup with mode sync and network connectivity is lost between primary & secondary.
Synchronous with full sync option (mode=sync. Full sync is configured with the parameter [system_replication]/enable_full_sync) means that log write is successful when the log buffer has been written to the log file of the primary and the secondary instance. In addition, when the secondary system is disconnected (for example, because of network failure) the primary systems suspends transaction processing until the connection to the secondary system is re-established. No data loss occurs in this scenario.
use the below url for correct order of executing hdbnsutil.
System Replication Implementation and Testing (part 1)
System Replication Implementation and Testing (part 2)
In our landscape we are using "async" replication with parameter logshipping_async_wait_on_buffer_full to false, we still have issue with hanastudio when we simulated network connection lost between primary and secondary. We have opened OSS message and SAP has accepted this is bug and they are working on it. we are at Rev 97.03.
Regards
Prashanth