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Exchange 2013 cu2 DAG implementation

We're planning a Exchange 2013 Cu2 DAG and had a few questions:

1)  I've read if the DAG cannot maintain quorum databases will dismount.  ie - In a 2 node DAG if you have 1 node down and you lose connection to the witness server you're pretty much screwed.  Does this change in a 3 or 4 node DAG?

2)  Is there anyway of clustering the witness server?  Without redundancy on the witness server it seems like we still have a single point of failure for the entire environment.  


We're planning on running a Exchange 2013 CU2 std 3 node DAG on 2008 Server R2 enterprise.  It will be a 4 node DAG once our second datacenter is complete.

Thanks!
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Will Szymkowski
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