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  • Adding cas and mailbox servers to a new site

    Hi everybody! This is my first time post in this forum. I hope I am asking the right question.
    I have two Exchange 2010 sp2 CAS/HUB and twoExchange 2010 sp2 Mailbox servers in the US. I would like to expand it to
    another office in China. What is the best way of doing this?
    I am thinking of adding another CAS/HUB and a Mailbox server (Active Database)
    in that region. Passive database stays in US. Any restrictioions of Active and Passive on different site.
    How are the users in China access to the local CAS server? A second URL? For
    example, the current one is webmail.company.com. The second one would be
    webmail-cn.company.com. Can I have just one URL which enable users to access to another CAS servers in different site?
    Do I run into any site problem with this design?
    Any other things that I should pay attention to? Any other suggestions are welcome.
    Thanks.
    Last edited by MailGuy; 10th May 2012, 23:22. Reason: forget the version of Exchange

  • #2
    Re: Adding cas and mailbox servers to a new site

    To have "active and passive" database copies you will need a DAG, so make sure you are using Server 2008 Enterprise on all the Mailbox servers. You can have cross site DAGs -- do some research () on the requirements, specifically where you place the witness servers to ensure proper failover. Also make sure you inter-site bandwidth is up to the mailbox replication traffic.

    You will need another CAS and HT role (mandatory in each site with MBX roles) and would give it a different name for external access, as you suggest.

    Basically, you should have no problems as long as you plan and research OK
    Tom Jones
    MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
    PhD, MSc, FIAP, MIITT
    IT Trainer / Consultant
    Ossian Ltd
    Scotland

    ** Remember to give credit where credit is due and leave reputation points where appropriate **

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    • #3
      Re: Adding CAS and mailbox servers to a new site

      I wouldn't do Active/Active over that kind of distance.
      If you want to keep a passive copy of the database in another location, then you would need to have two servers dedicated to that region. One server would be active, one would be passive. That would be separate from the current implementation. The servers can hold all of the roles though.

      You will need to have an RPC CAS Array in each AD site. This should be a unique name that does not resolve externally. It also does not need to be in the SSL certificate.

      Simon.
      --
      Simon Butler
      Exchange MVP

      Blog: http://blog.sembee.co.uk/
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      • #4
        Re: Adding cas and mailbox servers to a new site

        Thanks for your reply.
        Since I have a DAG (with 2 mailbox servers) in the US, can I dedicate a database in one of this server to hold the passive database? The Mailbox server (will be added to the DAG) in China will be holding the active copy. Of course I will be manually start the passive database instead of automatically start in case the WAN is not behaving but not the mailbox server.
        Can you explain a little more on this "This should be a unique name that does not resolve externally"? If I don't have an external URL, how the user access to their mailbox outside the office?
        Thanks.

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        • #5
          Re: Adding CAS and mailbox servers to a new site

          I am referring to the RPC CAS Array, which is an internal host name only. If the RPC CAS Array resolves externally then it causes a problem with Outlook Anywhere and other things. Hopefully you already have an RPC CAS Array, if not, then implement one now (it takes five minutes server side, but requires each Outlook client to be touched).

          I wouldn't mix the DAGs over such a distance.

          What happens if the connection fails? The China server will go offline. The fact that you want to do a manual activation doesn't mean anything - because you are using a single DAG you will be unable to keep the second location active during a connection failure.

          However if you have two DAGs, with the second DAG having its FSW in the remote location, in the event of a connection failure, both locations continue to operate.

          Simon.
          --
          Simon Butler
          Exchange MVP

          Blog: http://blog.sembee.co.uk/
          More Exchange Content: http://exchange.sembee.info/
          Exchange Resources List: http://exbpa.com/
          In the UK? Hire me: http://www.sembee.co.uk/

          Sembee is a registered trademark, used here with permission.

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