Planning for CAS Array with DAG intergation on Exchange 2010

We currently have 2 Exchange servers and have plans to add 2 more servers so it will be 2 servers with DAG and 2 servers with CAS array
Here is our current setup: EX01 has HUB, CAS and MAILBOX roles EX02 has MAILBOX only with DAG configured between 2 servers. 
Should I install another Exchange (EX03) with Mailbox role and remove it from EX01 and then have another EX04 to setup CAS array? What is the best practice ?
alex serdyukov

Hi,
In your case, you can install another Exchange (EX03) with Mailbox role and remove Mailbox role from EX01 and then have another server EX04 to setup CAS array.
Then you can deploy DAG using server EX02 and EX03, and add server EX01 and EX04 to CAS array.
Best regards,
Belinda Ma
TechNet Community Support

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