Hi. I'm currently looking at a design whereby I have 7 AD sites, with each site requiring access to messaging locally. I am looking at putting together a design based upon the following: Each Site has a single appropriately sized server with Mailbox/Hub/CAS roles. Database Availability Group with 7 members spanning all 7 AD sites Databases configured with a minimum of 3 database copies No redundancy of any role within any single site. This wouldn't be my first choice of design, but specific requirements may dictate something similar if this is a supported configuration. Any clarification of this would be greatly appreciated. TIA

Dear Shaun Use the sizing tool to design you Exchange 2010 Setup Exchange 2010 Mailbox Server Role Requirements Calculator http://msexchangeteam.com/archive/2009/11/09/453117.aspx Other Server roles requirements http://msexchangehelp.wordpress.com/2010/02/08/exchange-2010-prerequisites-system-requirements-recommendation/ Regards Niroshan Ezra Paulsingh My Blog | http://exchange2010info.wordpress.com/

I don't see any problem with the configuration but .. I would placed those server on 2 or 3 sites and make them HA, DAG/Casarray/HUB(Edge)/MX records etc http://technet.microsoft.com/en-us/library/dd638121.aspx If you haven't already read through it, give some time to read themJonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

Thanks both. I have already sized the servers adequately. In addition, I have already designed an rite resilient DAG configuration with high availability with site at the Hub/CAS role level over 2 sites. As I mentioned, the question I have asked is more of from a supportability point of view than best practice. I know this isn't a typical design, but this may not be suitable for my particular scenario. Under normal circumstances I wouldn't recommend this but.......you know how it is :) Thanks Again.

OK i see :) No problem, just ask if anything is unclear we will help youJonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog