Knowledge

ERROR_CLUSTER_DISK_NOT_CONNECTED - 5963 (0x174B)

Clustered storage is not connected to the node.

Updated: Feb 21, 2026

Technical Background

The ERROR_CLUSTER_DISK_NOT_CONNECTED error (0x174B) is a specific error code indicating that a disk in a Windows Failover Cluster environment is not connected to the current node. This error typically occurs during operations where the cluster needs to access or manage disks, such as during failovers or maintenance tasks.

Error Details

This error is generated when a clustered storage resource fails to connect to its designated node within the cluster. The failure can be due to various reasons, including hardware issues, network connectivity problems, or misconfiguration of the cluster resources. It is important to note that this error does not indicate a permanent failure but rather a temporary disconnection.

Common Causes

  • Hardware Issues: Physical disk failure or malfunction.
  • Network Connectivity Problems: Network link failures between nodes and storage devices.
  • Misconfigured Cluster Resources: Incorrect resource configuration in the cluster.
  • Resource Limitations: Exceeding the capacity of available resources.

Real-World Context

In a Windows Failover Cluster, disks are managed as shared resources. When a node needs to access these disks for operations such as failovers or maintenance, it must first establish a connection. If this connection is lost or not established properly, the ERROR_CLUSTER_DISK_NOT_CONNECTED error is generated.

Is This Error Critical?

The criticality of this error depends on the specific operation being performed and the state of the cluster. While the error does indicate an issue with disk connectivity, it may not necessarily cause immediate system instability unless the failure affects a critical resource or service.

How to Diagnose

To diagnose the ERROR_CLUSTER_DISK_NOT_CONNECTED error, follow these steps:

  1. Review Operation Context: Understand the context in which the error occurred (e.g., during failover, maintenance, or routine operations).
  2. Validate Parameters: Ensure that all parameters used for accessing the disk are correct and up-to-date.
  3. Confirm Object Types: Verify that the object types being accessed match the expected types within the cluster configuration.
  4. Verify Input Data: Check if there is any corrupted or invalid data that could be causing the connection issue.
  5. Check Limits or Constraints: Ensure that no resource limits have been exceeded, such as maximum number of connections or bandwidth limitations.

How to Resolve

To resolve the ERROR_CLUSTER_DISK_NOT_CONNECTED error, consider these practical steps:

  1. Correct Parameter Usage: Ensure all parameters are correctly set and up-to-date.
  2. Adjust Operation Context: If the operation context is incorrect, adjust it to match the current state of the cluster resources.
  3. Restore Data: If data corruption is suspected, restore from a backup or correct any issues in the storage system.
  4. Retry Operation with Valid Inputs: Attempt to perform the operation again using valid inputs and ensuring all prerequisites are met.

Developer Notes

Developers should be aware that this error can occur during various operations within a cluster environment. Proper handling of such errors requires understanding the underlying resource management mechanisms in Windows Failover Clusters.

Related Errors

FAQ

Q: What does the ERROR_CLUSTER_DISK_NOT_CONNECTED error indicate?

A: It indicates that a disk in a Windows Failover Cluster is not connected to its designated node, preventing access or management operations.

Q: How can I prevent this error from occurring?

A: Regularly monitor and maintain cluster resources, ensure proper network connectivity, and configure resources correctly to avoid misconfigurations.

Q: Can this error cause system instability?

A: Generally, it does not cause immediate system instability but may affect the availability of certain services or operations depending on the criticality of the affected resource.

Summary

The ERROR_CLUSTER_DISK_NOT_CONNECTED (0x174B) is a specific error code indicating that a disk in a Windows Failover Cluster environment is not connected to its designated node. This error can be caused by various factors, including hardware issues, network connectivity problems, or misconfiguration of cluster resources. Proper diagnosis and resolution involve reviewing the operation context, validating parameters, confirming object types, verifying input data, and checking resource limits.