What happens to a running Cluster if the quorum disk fails

Discussion in 'Clustering' started by Marc, Sep 11, 2007.

  1. Marc

    Marc Guest


    I am quite new to Clusetring and haven't found a real answer to the
    questions in the White papers.

    Imagine a 2-node Cluster with shared storae and a quorum disk on the shared
    SCSI storage too. What happens if the shared quorum disk fails (hardware
    reason) with the Cluster still running. Will teh Cluster stay up and running
    or will it stop working.

    I found some answers that point ot the Cluster will not start if the Quorum
    is not available but I am talking about a running Cluster.

    Marc, Sep 11, 2007
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  2. Marc

    Mike [MSFT] Guest

    Hello Marc,

    I'm not sure how much information you want here, so I'm jump in with both

    In Windows Server 2003, the Quorum disk resource is required for the Cluster
    to function. In your example, if the Quorum disk suddenly became unavailable
    to the cluster then both nodes would immediately fail and not be able to
    restart the clussvc.

    In that light, the Quorum disk was a single point of failure in a Microsoft
    Cluster implementation. However, it was usually a fairly quick workaround to
    get the cluster back up and operational. There are generally two solutions
    to that type of problem.

    1. Detemrine why the Quorum disk failed and repair.
    2. Reprovision a new LUN, present it to the cluster, assign it a drive
    letter and format. Then start one node with the /FQ switch and through
    cluadmin designate the new disk resource as the Quorum. Then stop and
    restart the clussvc normally and then bring online the second node.

    Mike Briggs [MSFT]
    Windows Server 2008 Beta Engineer
    Windows Cluster Support Team
    Mike [MSFT], Sep 11, 2007
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  3. Marc

    Elden Guest

    But this is all fixed in Windows Server 2008!! The cluster will now survive
    if the quorum goes down
    Elden, Sep 12, 2007
  4. While all this is true, you can offcourse run an MNS cluster without a
    quorum disk, but with a FSW.

    Edwin vMierlo [MVP], Sep 12, 2007
  5. Not only that, you can actually simple "off line" your quorum disk in a
    running 2008 cluster, if you want to....
    And it that is pretty cool !!
    .... actually all of clustering in 2008 is pretty cool...
    Edwin vMierlo [MVP], Sep 12, 2007
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