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migrating to Exchange 2010 from 2003 and implementing DAG

Posted on 2012-09-21
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I'm about to migrate Exchange 2003 to Exchange 2010 with DAG.  As I understand DAG supports incremental deployment which means a cluster is not required prior to the DAG deployment.  Since I'm starting from scratch I would like to deploy this correctly.  It seems that Exchange 2010 and DAG is fairly straight forward in regards to the deployment.  Below are the steps I plan to take..  Of course this is just a basic over view.  I would like other people's input so I can plan properly.

I plan to spin up a VM with 8 GB's of RAM.  Since I have such a small environment (110 mailboxes with 170 GB's) I plan to place all roles on one server.  DAG supports this and my environment is small.

I than plan to spin up another VM but I assume this one will only need mailbox role since this will be the standby DAG server?  

Then I plan to move all mailboxes to the new multi role server (assuming the standby DAG doesn't need multi role)

Set all of the static NAT's so emails going out and in have the same NAT translations to the internet for my new CAS that is replacing my 2003 FE. Once Exchange 2010 environment with DAG is deployed I plan to route all inbound/outbound emails to my CAS server.

I plan to change my SMTP banner to match my internet DNS record for reverse DNS standards.

What else do I need to think about?  I know there are many steps to make this happen but am I in the right direction?
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Question by:gopher_49
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johan_v earned 2000 total points
ID: 38424121
Hi,

First of all I recommend you to use the mailbox calculator to determine if your sizing is correct.

http://gallery.technet.microsoft.com/office/Exchange-2010-Mailbox-Server-Role-

Besides this I would recommend to make the second server also a multi role server this because this makes your environment more high available. And is also the best practice sizing according to the server ratio mentioned in this article: http://technet.microsoft.com/en-us/library/dd346701.aspx

But don't forget if you really want to load balance smtp and web traffic (owa, activesync etc) you will need a hardware load balancer.

In either scenario create a CAS array also if you choose to only implement one CAS server.

The rest of the idea looks fine.

Regards,
Johan
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