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Exchange 2010 DAG and FailoverClustering 1135 & 1177

    Question

  • Hi all.

    We have the current Exchange 2010 configuration, using a DAG:

    SITE A -  the US
    (2) CAS servers
    (2) Mailbox Servers

    SITE B - in Europe
    (2) CAS servers
    (2) Mailbox Servers

    This morning, all of the mailboxes on the second node in SITE A failed over to node 1 in SITE A.  SITE B in Europe was unaffected.

    We are getting FailoverClustering events in the System log on nodes in SITE A and SITE B. Node B in SITE A (which currently has no databases mounted on it) had 1177 events in the event log:

    FailoverClustering 1135 (appearing on ALL servers)

    Cluster node '___MAIL01' was removed from the active failover cluster membership. The Cluster service on this node may have stopped. This could also be due to the node having lost communication with other active nodes in the failover cluster. Run the Validate a Configuration wizard to check your network configuration. If the condition persists, check for hardware or software errors related to the network adapters on this node. Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges.

    FailoverClustering 1177 (appearing on Node B in SITE A)

    The Cluster service is shutting down because quorum was lost. This could be due to the loss of network connectivity between some or all nodes in the cluster, or a failover of the witness disk. 
    Run the Validate a Configuration wizard to check your network configuration. If the condition persists, check for hardware or software errors related to the network adapter. Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges

    The DAG Hotfix (http://blogs.technet.com/b/exchange/archive/2011/11/20/recommended-windows-hotfix-for-database-availability-groups-running-windows-server-2008-r2.aspx) was installed about a month ago, as we were seeing these events. It happened twice already this week.

    Any ideas where to start or the possible cause?


    Brandon Carder

    Wednesday, March 14, 2012 2:52 PM

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