DR within Same Site Using Different Virtual Directory Names

We are deploying Exchange 2013 and have setup a set of 2013 servers in a different building we would like to use for DR.
We have 2 servers in our main datacenter behind a load balancer and 2 servers in a 2nd datacenter within the same DAG. So mailbox databases are already on the servers. However for the CAS role, we are looking at just setting the DR servers to
have different virtual directory names so in a DR situation, we just need to tell people to access owadr.domain.com instead of owa.domain.com. The DR servers would be behind a 2nd load balancer only configured to talk to those two servers.
Both of these datacenters are in the same AD site, and the network vLANS are stretched across each datacenter so DAG replication is already working. The primary serves are already working behind the production load balancer. Just need to make
sure we are going in the right direction for the DR setup. Our public certificate already names the names of owa.domain.com, owadr.domain.com, and autodiscover.domain.com on the cert. We are not really concerned so much with Outlook/ActiveSync
traffic in a DR situation, but would just like OWA to be a temporary solution while the main datacenter recovers. So a different virtual directory name should work right?

Hi,
From your description, I know four servers are in the same site but with different building. So you create two load balancer. And it seems you add the DAG members into Load Balancer. Could you confirm if you use WNLB?
In fact, WNLB can't be used on Exchange servers where mailbox DAGs are also being used because WNLB is incompatible with Windows failover clustering. If you're using an Exchange 2013 DAG and you want to use WNLB, you need to have the Client Access server
role and the Mailbox server role running on separate servers. See more details in the following link:
http://technet.microsoft.com/en-us/library/jj898588(v=exchg.150).aspx.For
For your environment, I have a suggestion: we can deploy two servers with only CAS role installed. One cas in one datacenter. Put them in one Load Balancer. Point OWA URL to this load balancer. So when one datacenter is down, the request will
go to anoter CAS in another datacenter. And the OWA URL is not changed..
But if you want to use two OWA URLs for each datacenter. owa.domain.com and owadr.domain.com. You can set OWA internal URL and external url on CAS servers in DR site to use owadr.domain.com. And ask users to login
https://owadr.domain.com/owa instead of
https://owa.domain.com/owa when the primary datacenter is down.
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Silver

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