I have to install a new Unity 5.0 (with failover) UM mode for Exchange 2003 for a customer.
An existing Unity 4 UM is running but I will install both new servers on new hardware servers.
According to what I read, I can do the new installation in parallel of Unity 4 production, extend the AD schema with the unity 5 assistant, and migrate subscribers using GSM and COBRAS tools to finalize the migration.
But I want to receive confirmation from you guys about the AD integration.
Customer has a single forest with two child domains. Currently, subscribers are only on one of both domains but with the new Unity 5.0 infrastructure, subscribers will be from both domains.
What I want to know if it's a supported design: using one unity server (with failover) to manage subscribers from two different domains (but into a single forest).
If it works technically, how? Because Unity servers must be members of an existing domain, but which one should I choose?
Thank you for your help.
That is a supported design. We have configurations that have a single forest with multiple peer and/or child domains in our QA test lab. If you've got Exchange servers in the different domains, you'll need to run Permissions Wizard on the different mail stores before installing Unity.
I'm not an AD expert, so I can't explain how it works technically. I'll leave that to somebody else.
As to which domain to add the Unity server to, I don't think it matters.
I was looking through the Unity Design Guide chapter on Exchange (http://www.cisco.com/en/US/docs/voice_ip_comm/unity/5x/design/guide/5xcudg040.html) to see what it has to say on the issue, and the only thing I saw was the following:
"If Cisco Unity subscribers are homed in more than one domain, a DC for each domain must be in the same data center as the Cisco Unity server.