test DR in exchange 2010


I have two sites and the server as below

HUB  (HUBCAS role)
MBX01  (MBX role)
MBX02  (MBX role)


EXCH01  (All in one role)

I have a DAG and all above servers are members of that DAG

I have 4 databases replicating each other

All databases are mounted in MBX01

Now I wanted to do a DR test

I want to shutdown all 3 servers in site1 and mount all 4 databases in site2

and need to test the mail flow.

Then again I want to bring the site1 servers up and mount all databases in mbx01

What are the steps I need to take for failover and failback

and how much time it required..

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