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Failover Virtual Machines When Network Disconnection RRS feed

  • Question

  • Dears,

    I have 2 hosts (WS2008R2-SP1) that are connected together to a SAN storage. When disconnecting the network from one of the hosts, the VMs don't failover to the other host, but if the host is down, the VMs failover successfully.

    Is there anyone who has an idea of how to make the failover when the network disconnects??

    • Moved by BrianEhMVP Tuesday, May 29, 2012 2:43 PM (From:Hyper-V)
    Sunday, May 27, 2012 2:03 PM

Answers

  • Hi!

    If the cluster doesn't automatically initiate a failover when a host loses its network connection, it means that the clustered nodes still have an established heartbeat connection through another network.

    Check the networks in your failover cluster manager, and disallow cluster communication through eventually detected SAN networks or similar.

    If you mean that the cluster doesn't failover VM's when the host loses the connection to the NIC used for virtual machine networking, then this is normal. The cluster only initiates failover when a Hyper-V node is considered absent and does not take any consideration to what happens with the virtual machines.

    Sunday, May 27, 2012 4:04 PM
  • Hi,

    In Failover Cluster console, click on Networks, right on the “Cluster Network X”, you will be able to see the settings like the following screenshot. If you have the box “Allow cluster network communication on this network” checked on several network adapters, when one of them is down, the cluster may works properly instead of failover.


    Monday, May 28, 2012 1:59 PM
    Moderator

All replies

  • Hi!

    If the cluster doesn't automatically initiate a failover when a host loses its network connection, it means that the clustered nodes still have an established heartbeat connection through another network.

    Check the networks in your failover cluster manager, and disallow cluster communication through eventually detected SAN networks or similar.

    If you mean that the cluster doesn't failover VM's when the host loses the connection to the NIC used for virtual machine networking, then this is normal. The cluster only initiates failover when a Hyper-V node is considered absent and does not take any consideration to what happens with the virtual machines.

    Sunday, May 27, 2012 4:04 PM
  • Hi,

    In Failover Cluster console, click on Networks, right on the “Cluster Network X”, you will be able to see the settings like the following screenshot. If you have the box “Allow cluster network communication on this network” checked on several network adapters, when one of them is down, the cluster may works properly instead of failover.


    Monday, May 28, 2012 1:59 PM
    Moderator