MS Cluster - Quorum Drive

Posted on 2011-10-11
Last Modified: 2012-05-12
Hi All,

I have Windows clustering (Active/Passive) running on two Win 2003 R2 x64 servers.

I am relativley new to clustering but I am planning on failing over to my passive node to do some maintenance on the current active one.

First problem I have come across is that I cannot locate the Quorum drive, on both machines in disk management there are only C: and D:  my understanding was that the Quorum drive had to exist in this enviroment... if so, where is it?

Question by:techmiss
    LVL 9

    Expert Comment

    In the event of failure, Windows Clustering maintains a primary node, and replicates changes for the cluster registry by means of a shared disk. This disk is called the quorum drive. The quorum drive has two responsibilities:

        It replicates the cluster registry to all other nodes in the server cluster. The cluster registry is stored in the following location on each node:
        The cluster registry is replicated to the \Mscs\Chkxxx.tmp file on the quorum drive. These files are exact copies of each other and can be manually copied and renamed to replace each other. The Quolog.log file is a transaction log that maintains a record of all changes to the checkpoint file so that these changes can be appended to nodes that were offline when they join back into the cluster. Quolog.log is stored in the \Mscs directory on the quorum disk.
        If there is a loss of communication between the nodes in the cluster, a "Split Brain" scenario occurs. In this situation, the owner of the quorum disk resource becomes the only owner of the cluster and all the resources. The owner then makes the resources available for clients. When the node that owns the quorum disk does not function correctly, the surviving nodes arbitrate to take ownership of the device. In a single cluster, there is a local quorum resource. In the event of a hardware failure of the quorum disk, it may be necessary to designate another device as the quorum disk.

    The quorum disk is located on a shared bus in the cluster. Use the following procedure to designate a different drive for the quorum device:

        Start Cluster Administrator (CluAdmin.exe).
        Right-click the cluster name in the upper-left corner, and then click Properties.
        Click the Quorum tab.

    For more info refer this microsoft article

    Author Comment


    When I click on the Quorum tab, the root path of such is  "\MSCS\"   where exactly is this?

    LVL 9

    Accepted Solution

    \MSCS\ is the path were quorum resides.

    You might also see Quorum Resource and Partition under that tab.

    Quorum resource means under that drive quorum resides for example "Disk E:"

    so Quorum path will be e:\MSCS\

    Hope this clears ur doubt

    Author Comment

    Hi Ahmed786,

    Nearly there, I would expect to see a drive / partition there instead, but I have as in the picture - what could this denote?

     Quorum properties
    LVL 9

    Expert Comment

    You can try to search the entire drive by the name MSCS and lets see where you can find that path.

    Author Closing Comment

    Thanks, found it in c:\windows\cluster

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