What does Windows error code 5925 (ERROR_CLUSTER_NO_QUORUM) mean?

 
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ERROR_CLUSTER_NO_QUORUM

ERROR_CLUSTER_NO_QUORUM means too few votes were available to form or keep the cluster running. It is a safety mechanism intended to prevent split-brain operation.

What to check

  • Determine which nodes and witness are currently reachable before starting or evicting anything.
  • Review node vote and witness configuration, especially after site, network, or maintenance changes.
  • Restore normal connectivity or follow the documented disaster-recovery procedure for the cluster design.

Important: Do not force quorum unless you understand the recovery procedure and its data-consistency implications.

Get-ClusterQuorum
Get-ClusterNode | Format-Table Name, State, NodeWeight, DynamicWeight

Microsoft: Quorum witness

Microsoft: Deploy a quorum witness

Microsoft: Troubleshoot unexpected cluster failover

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