Exchange server DAG Design

Hi Team,
 
We are planning to install exchange 2010 in our environment,I am in a process if designing the database placement .I have four servers for the mailbox role and two data centers. The plan is to keep two servers in each data center.


I need your help in providing some best practices to place the database in each server.
Where I want to achieve high availability.

We have 8 thousand users and planning to keep 1GB mailbox size.

Regards,

Saroj
sarojtbAsked:
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AmitIT ArchitectCommented:
You said two data center. I assume Data Center 1 will be primary and 2 will be just for DR purpose. Remember DAG is just HA for Mailbox role. You need to consider HA for HUB / CAS as well. Read this article first, will give you understanding, how to design HA.

http://www.msexchange.org/articles-tutorials/exchange-server-2010/high-availability-recovery/designing-site-resilient-exchange-2010-solution-part1.html
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sarojtbAuthor Commented:
Yes we have the 2HT/CAS server available in each data centers along with the two mailbox servers.
Now I need to know if i have to host only 2000 mailboxes in each server how I will go with the DAG design ,

 I mean distribute the active/passive database across all the four nodes.

Regards,
Saroj
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AmitIT ArchitectCommented:
Do you want both site to be active always or one will be DR site.
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If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.

sarojtbAuthor Commented:
One site will be used for DR and will hold passive copies.
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AmitIT ArchitectCommented:
Use Exchange 2010 mailbox calculator for server sizing. this will help you to estimate server size requirement.
http://gallery.technet.microsoft.com/office/Exchange-2010-Mailbox-Server-Role-
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sarojtbAuthor Commented:
Na
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