BizTalk Production and DR setup

Dear Gurus,

I need your help very badly. Our
client has a BizTalk environment like above under the same domain.

Everything BizTalk and SQL
installed on configured on machine(I know it’s a bad design, but client is not
ready for more severs). Please note that PRODUCTION and DR has different names.

Now client is asking us for DR
practice, meaning they want to shutdown the PROD and make the DR ready. Everything
in PRODUCTION site is mounted in SAN, they simply replicated all the BizTalk
and custom databases to DR site.  Obviously
this solution is not working as all the DB contains PROD server name. Now they need
immediate solution.

I am not a Infra guy not BizTalk
admin, but I suggested  hem for two
solutions.

1. Rename the SQL-Server to point
its own DB.

– Remove server from the list of known remote
and linked servers on the local instance of SQL Server.
EXEC master.dbo.sp_dropserver ‘[SERVER NAME]‘

– Define the name of the local instance of SQL
Server.
EXEC master.dbo.sp_addserver ‘[NEW SERVER NAME]‘, ‘local’

In the above case I will pass DR server name as a parameter, so the
change will happen in low level. In fact that’s what I needed. After that I
will also change the master secret sever as per the recommendation from
microsoft(http://msdn.microsoft.com/en-us/library/aa559842.aspx)

We have a risk here,  remember they replicated all DB info from
production to DR site, still the DB holds the value of PROD server. So we ask
them to turn off the production(down time) and proceed with the server name.

2. We create a new DR environment
like DR, later we change the server name.

Please advise me, really I am not
sure on how to resolve the above issue.