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Maintaining Quorum DAG members across AG sites

Answered Maintaining Quorum DAG members across AG sites

  • Tuesday, May 01, 2012 8:24 PM
     
     
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    SITE I - Primary
    Two: C/HT/MB
    One: FSW

    SITE II - CoLocation
    Two: CAS
    Two: HT/MB
    One: Alt. FSW

    Now if site two goes down due to power outage.. Primary flies solo, no problem
    But, if during the power outage ONE of the servers in Primary reboot/fail.. we loose node majority.. mail fails.. we need to restart cluster service in forced quorum (/fq) and evict a DAG node.

    What is the best solution?  Adding two more mailbox servers in Primary?

     

     

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  • Tuesday, May 01, 2012 9:32 PM
     
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    Hello,

    What you can do is to use two DAG.

    let's say:

    • DAG1: two MBX in Site 1 and one MBX in Site 2. Witness server in Site 1
    • DAG2: two MBX in Site 2 and one MBX in Site 1. Witness server in Site 2

    On DAG1, add mailboxes of users in Site 1 on its databases.

    On DAG2, add mailboxes of users in Site 2 on its databases.

    Like that, if a site is down then the second site will not be down and you will have a passive copy of databases of the down site.

    For more information about Datacenter Switchovers: http://technet.microsoft.com/en-us/library/dd351049.aspx

    This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.   

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  • Tuesday, May 01, 2012 10:26 PM
     
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    Dont forget to add your CAS\HT roles as well in both sites

    Bulls on Parade