How is Exchange 2010 DAG with NLB possible?

355LT1 used Ask the Experts™
I have an existiing Windows 2008 DC with Exchange 2010 with all three roles. Can I setup a new Windows 2008 Hyper V VM with Exchange DAG for failover with NLB ? How?
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Rick FeeMessaging Engineer - Disaster Recovery Engineer

No...When you have DAG setup you can only use a NLB hardware appliance, if you have CAS/HUB on the same server.   You can't setup WNLB and DAG on the same server.   You need to break off the CAS/HUB roles from the Mailbox if you want to use WNLB.
Solutions Architect
1. you cannot use Windows NLB on a server with DAG you need a hardware load balancer for this
2. it is a very bad idea to use join domain contorller to a cluster
It isn't supported to add an Exchange 2010 Mailbox server that's also a directory server to a DAG.

DC + Exchange and Everything else in the world on the same server is wrong to start with anyways ( with exception of SBS (-:,  go figure why......




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