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I am building a cluster of 4 nodes along with a file share witness. Every month due to server updates the server that holds the file share will need to be rebooted. My question is while the file share becomes unavailable during that time will the cluster go down?

  • What is version of Windows server ?, please add that in the question. – Shanky Feb 14 at 15:18
  • Direct answer, if only the FS witness is down cluster will not come down. It still has 4 votes assuming all are voting – Shanky Feb 14 at 15:18
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No, the cluster will not go down until a node cannot form quorum. Assuming all four nodes have a quorum vote, there are five possible votes. Accordingly a node will have to get three votes to maintain or gain quorum. When the file share witness goes offline, the node that currently owns quorum will maintain ownership because it can still get four votes.

See Understanding Quorum in a Failover Cluster for the long answer.

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