How to DAG work in the case of one DAG fail

Hi,
Suppose my one DAG copy failed then how to switch exchange on second copy of DAG.
In 2007 exchange we configure cluster,But in 2010 there is no cluster feature,so how it switch from one DAG copy to Another DAG copy in the case of failure.
Regards
Anil 

Hi,
Yes, there is cluster feature in Exchange 2010 as Steve mentioned above.
If the active mailbox database copy is dismounted, then it will switch over to another database copy (a passive copy) automatically.
Best regards,
Belinda Ma
TechNet Community Support

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