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There are generally 3 ways to do this, described in the doc, you are describing option 1 where they are on separate networks with the same names:
Host Name Requirements
An EPM System Disaster Recovery deployment requires a means of resolving host references
between the production and standby sites. Ensure that your configuration uses one of these
options, listed in order of preference:
- Production and standby sites are on separate networks. The fully qualified host names can be the same in both sites.
- Production and standby sites have different DNS that resolve the host names to the correct IP address in their network.
The standby site can have a standby DNS that is activated when a disaster occurs.
- Production host names are resolved to a local IP address at the standby site by means of an /etc/hosts file.
If you have separate networks in that the two servers have the same name but are completely segregated and everything including the database server is the same then yes, you are describing the first DR scenario. I would recommend the hosts file option as it would ensure the hosts always resolve to what you expect.