Mapi connection behaviour between two sites-Exchange 2010

I have small doubt, need help from you guys,
i have two sites A, B,  DAG is span over the two sites;
Both site has array Of different FQDN
site A has active copies, its PASSIVE copies are in site-B
i have witnesserver in third location
if Active mailbox database in Site-A fails, passive copy on Site-B will become active;  i guess
My question is ===>  without downtime or without MANUAL Task, will mapi connection goes to site-B copy ??? ,

In Cross Site maintainence we, have to work out mainly on Database Activation Coordination Mode(DAC) which avoids the split brain syndrome.
below URL's gives you clear vision on how we can do that and what it is for.
Gowtham T

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