Hello Kazuaki Anzai,
On your DR site you have to use same host name for your SQL instance.
It can be active - passive kind of setup.
Please let me know if you have more questions, I can explain you all in detail.
Regards,
Yogesh
This question is very trick as it is specific to your scenario, and I don't quite understand it.
There are several techniques to build HA/DR (High-Availability/Disaster Recovery) systems.
For SQL Server specifically, as of SQL Server 2012 you should use AlwaysOn Availability Groups. Here you can read more about it:
https://blogs.msdn.microsoft.com/saponsqlserver/2015/10/23/sql-server-alwayson-summary/
For the ERP/NetWeaver system on Microsoft you only have the option of high-availability with the Failover Cluster (MSCS), as building a DR option it not supported/documented (means you probably have to build your own DR mechanism).
You cannot have systems running with the same hostname.
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