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Migrating 2 exchange 2010 servers with dag to 2013 - planning

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Our current setup as follows: EX01 2010 (hub, transport, mailbox)   EX02 2010 (mailbox)  with dag setup. 

The goal to migrate our environment to 2 2013 servers both having all 3 roles and DAG and CAS array using round robin for failover - to ensure redundancy and High avaliability with minimum down time.

I'm looking for step by step plan.  So far here is what I have:

1. Install server 2012 with Exchange 2013 with mailbox role only

2. Stop DAG replication and dismount databases on EX02 (passive copies) mount databases on EX 2013

3. Stop mailbox role on EX01 and point it to EX 2013

4. Install Transport Role and CAS array (Proxy?) on  EX 2013

5. Stop Transport and CAS services on EX 01 and remove ex 2010 from the environment

6. Install another copy of EX 2013 on separate server and create dag and CAS array between them

This is just a idea that I have and I realize that there are some steps that I'm missing. I would be grateful if some exchange pros would fill in the blanks. Also looking for some good articles to read. The problem is that every environment is different and its hard to find exactly what I'm looking for. Thank you


alex serdyukov


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