Announcement

Collapse
No announcement yet.

Use Branch office as a Warm DR Site?

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Use Branch office as a Warm DR Site?

    Hi,
    I'm wondering about the possibility of setting up a remote office as a warm DR site. The 2 sites are linked via 1 T1 line. Currently each site has an Exchange 2003 server + a "front-end" server in a DMZ at main site for OWA. Each location has its own internet link. I want to forklift this into a "site-resilient" 2007 environment. The branch office users can have their mailboxes at the main site, they can just run outlook on Citrix or something.

    There are a few issues here... most notably, the clustering mehtod for the mailbox servers. I have heard that you can do cross-subnet CCR, if you install it on Server 2008, but haven't seen any more details on doing this. Therefore I am leaning towards SCR in the remote site, since I think it would be cost-prohibitive to set up a stretched subnet etc.

    I'm also a little curious as to how the HT / CAS role redundancy would work. I am aware that we would probably take the "front-end" server out of the DMZ at the main site, and transition to CAS role in main server farm... correct? Teh other thing is mail routing redundancy with the HT component, and how that would work... aside from just changing MX record.


    Moose

  • #2
    Re: Use Branch office as a Warm DR Site?

    What have you got in the DMZ?
    If is anything but Edge then you aren't supported.

    You could SCR each server to the other. I have done that a number of times.
    When it comes to HUB, as long as the servers are in the Exchange forest you can deliver email to any hub transport server in the network and Exchange will ensure it is delivered.
    If you have two Internet connections, then set them up identically, except for different external host names and PTR records (so same antispam etc) and have both servers in the MX records with the same cost.

    For CAS, that should proxy, but as SCR isn't live fail over you will have plenty of time to sort out client access.

    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.

    Comment


    • #3
      Re: Use Branch office as a Warm DR Site?

      Hi Simon, I think it's coming together, let me see if I understand you

      I know 2003 "front end" server is supposed to be internal, not in DMZ, unfortunately I'm inheriting this deal.. So the first step in 2007 migration would probably be to set up my CAS/HT at the main site, and point users outlook to that, and move OWA / ActiveSync to this. Then I can remove that front end in the DMZ.

      Then I can go ahead and set up CAS/HT at remote sites, along with their MB servers and migrate them, and set up site-to-site SCR each way. Incidentally, with SCR, can I run all 3 roles on the same box?

      The last thing I'm sketchy on is this: currently, users from multiple AD sites access OWA by browsing to the same "front end" server in the DMZ. According to the Exchange 2007 docs, if you have multiple CAS servers in multiple sites, you have to either point users to unique URLs (each to their own CAS server) or use a reverse proxy (like ISA) to provide one external point of contact for external users. Is this true? Can't I point everyone to the same CAS sever?

      Comment


      • #4
        Re: Use Branch office as a Warm DR Site?

        Originally posted by Moose1309 View Post
        . Incidentally, with SCR, can I run all 3 roles on the same box?
        OK I just answered that question; from the docs:

        An SCR target computer must have the Mailbox server role installed, even if it does not host production mailboxes. The Mailbox server role is required because it includes the Microsoft Exchange Replication service and other components necessary for SCR functionality. If the SCR target computer is not clustered, it can also host other server roles, such as the Hub Transport, Client Access, and Unified Messaging server roles.
        RTFM huh..

        Comment


        • #5
          Re: Use Branch office as a Warm DR Site?

          Personally I would be looking to correct the existing installation, which includes removing the server from the DMZ so that things can work correctly.

          You should be able to point everyone to same CAS, but it may well have to be a standalone CAS, not one that is holding the other roles so that the proxy works correctly.

          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.

          Comment

          Working...
          X