The Clusters - Node Unavailable Alarm alarm is raised when Spotlight detects that at least one cluster node (computer system) is not currently running as part of the cluster.
This alarm can only be raised when you are connected to a SQL Server that is running as part of a Microsoft Cluster Server (MSCS).
When a cluster node (i.e. a computer system that participates in a cluster) is unavailable, the workload that it normally processes will fail over to other computer systems in the cluster, resulting in lower performance.
When the alarm is raised:
- Check the SQL Server | Support Services drilldown | Cluster Services page to determine which cluster node is unavailable.
- Verify the computer system is running and that Windows is operating normally.
- Verify the Cluster Service is running on the computer system.
- Use the Windows event logs to determine why the computer system is not participating in the cluster. For more information, see the Windows Server | Events Logs drilldown.