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DAG Question

Discussion in 'Software' started by Theprof, Mar 14, 2012.

  1. Theprof

    Theprof Petabyte Poster Forum Leader

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    Hey guys, I have a quick question.

    As I've mentioned before, I am working on an Exchange 2007 -> 2010 migration (CCR->DAG). Brainstorming with the team, we were thinking about deploying Exchange 2010 onto three different sites to make mailboxes available locally on the LAN for the users in each office. From a DR perspective I pretty much got it covered, also other sites must maintain the quorum. We would like for All of this will be done in one domain which spans across these three sites. The WAN is a pretty fast link and works through MPLS.

    I should probably deploy multiple DAGs and each DAG will have a witness in its own site so for example DAG1 will have a witness in site 1 and DAG2 will have a witness in site 2, etc

    Would this be a good approach in terms of keeping all three DAGs/Quorum operational in other sites in case one site suffers an outage?

    The databases will replicate to each site.
     
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  2. Gav

    Gav Kilobyte Poster

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    Unless I've misunderstood what you're trying to do, it should be possible to use a single DAG. Assuming you have two DBs one server per site:

    Site1MBXSrv

    Site1DB1 - Active
    Site1DB2 - Active

    Site2DB1 - Witness
    Site3DB2 - Witness

    Site2MBXSrv

    Site2DB1 - Active
    Site2DB2 - Active

    Site1DB2 - Witness
    Site3DB1- Witness

    Site3MBXSrv

    Site3DB1 - Active
    Site3DB2 - Active

    Site1DB1 - Witness
    Site2DB2 - Witness

    In that example, if you lost Site3, the Site3DBs would become active on Site1 and Site2. You could have multiple servers per site in the above example, you'd just have to distribute the databases accordingly. Unless you have more than sixteen servers/sixteen databases, it should be pretty straightforward with a single DAG :-)
     
  3. Theprof

    Theprof Petabyte Poster Forum Leader

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    Gotcha, thanks for the reply, I actually want to have 2 MBX servers in each site but that would created quite a few DB's..
     
    Certifications: A+ | CCA | CCAA | Network+ | MCDST | MCSA | MCP (270, 271, 272, 290, 291) | MCTS (70-662, 70-663) | MCITP:EMA | VCA-DCV/Cloud/WM | VTSP | VCP5-DT | VCP5-DCV
    WIP: VCAP5-DCA/DCD | EMCCA

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