changing name of OMS DB Repository in emctl/emca?

 Hello, all. Question about changing the DB repository pointer on the OMS console once we move from single-instance to Data Guard physical standby.We started off the OMS install with a single instance database repository:

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Original:

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DB Host A:

hostname:dbhosta

db_name=EMPROD01

instance_name=EMPROD01

.. but now we would like to add a physical data guard standby DB

- our OMS app is on a separate server , pointing to DB repository at dbhosta:1521/EMPROD01

- we are doing filesystem copy of the OMS (rsync) from omshosta to omshostb

- the OMS dir should be the same as what's on primary site.