Does cluster go down if one of the node is restarted manually and the file share witness is unstable?



  • I am exploring the 2 node cluster with file share.

    The example is as shown here: https://docs.microsoft.com/en-us/azure-stack/hci/concepts/quorum#two-nodes-with-a-witness

    enter image description here

    Majority is 2/3. So when either node goes down, the cluster will stay up.

    My question is - suppose the node 2 is restarted by an engineer as part of maintenance/patching without taking it out of the cluster, and the file share is unstable, then will the cluster dynamically adjust to survive with 1 node (primary) vote? Or will cluster go down?

    I understand there is dynamic witness and dynamic node voting that should handle this? haven't found any documentation about this example - how dynamic vote kicks in when only node 1 and file share witness (2 of the originally configured 3) are alive.



  • If the witness is not accessible, the cluster should readjust the vote so that only one of the 2 node gets a vote.

    Knowing that, if you are lucky, the node that will be rebooted will not have a vote and the other node will remain up. If you are not and the rebooted node was the one with the vote, then the cluster will go down.

    The big question is why is your witness unstable ? This is an important part of the cluster and it should not be "unstable" so I would put some time to fix this if I were you. After all, you build a cluster to have high availability and if you can't trust the witness, you can't say you have HA.




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