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Alternate FSW questions RRS feed

  • Question

  • We are running Exchange 2010 SP2.  We have two Data Centers - London and Paris.

    At the moment, the FSW is listed in London.

    I understand it's possible to configure an Alternative FSW...but I can't see much documentation on how this works? Will this come into place if the original FSW is down, automatically?
    Saturday, August 11, 2012 7:15 PM

Answers

  • No, it is not automatic and does not provide redundancy.
    See:
    http://blogs.technet.com/b/exchange/archive/2011/05/31/exchange-2010-high-availability-misconceptions-addressed.aspx

    Misconception Number 1: The Alternate Witness Server (AWS) provides redundancy for the Witness Server (WS)
     
    The actual name – Alternate Witness Server – originates from the fact that its intended purpose is to provide a replacement witness server for a DAG to use after a datacenter switchover. When you are performing a datacenter switchover, you’re restoring service and data to an alternate or standby datacenter after you’ve deemed your primary datacenter un-usable from a messaging service perspective.
     
    Although you can configure an Alternate Witness Server (and corresponding Alternate Witness Directory) for a DAG at any time, the Alternate Witness Server will not be used by the DAG until part-way through a datacenter switchover; specifically, when the Restore-DatabaseAvailabilityGroup cmdlet is used.
     
    The Alternate Witness Server itself does not provide any redundancy for the Witness

    • Proposed as answer by Martina_Miskovic Sunday, August 12, 2012 7:36 AM
    • Marked as answer by emma.yoyo Friday, August 17, 2012 1:56 AM
    Saturday, August 11, 2012 7:34 PM
    Moderator

All replies

  • No, it is not automatic and does not provide redundancy.
    See:
    http://blogs.technet.com/b/exchange/archive/2011/05/31/exchange-2010-high-availability-misconceptions-addressed.aspx

    Misconception Number 1: The Alternate Witness Server (AWS) provides redundancy for the Witness Server (WS)
     
    The actual name – Alternate Witness Server – originates from the fact that its intended purpose is to provide a replacement witness server for a DAG to use after a datacenter switchover. When you are performing a datacenter switchover, you’re restoring service and data to an alternate or standby datacenter after you’ve deemed your primary datacenter un-usable from a messaging service perspective.
     
    Although you can configure an Alternate Witness Server (and corresponding Alternate Witness Directory) for a DAG at any time, the Alternate Witness Server will not be used by the DAG until part-way through a datacenter switchover; specifically, when the Restore-DatabaseAvailabilityGroup cmdlet is used.
     
    The Alternate Witness Server itself does not provide any redundancy for the Witness

    • Proposed as answer by Martina_Miskovic Sunday, August 12, 2012 7:36 AM
    • Marked as answer by emma.yoyo Friday, August 17, 2012 1:56 AM
    Saturday, August 11, 2012 7:34 PM
    Moderator
  • Hi Redman,

    Any updates?


    Frank Wang

    TechNet Community Support

    Tuesday, August 14, 2012 3:02 AM