How should a CSV be recovered after a temporary cluster network failure?

Jiya Raha 100 Reputation points
2026-08-18T06:35:04.94+00:00

After a brief network flap on one Hyper-V cluster node, one of our Cluster Shared Volumes remained in a Paused state and reported error 0xc000020c.

Cluster networking has already recovered, but the affected CSV did not return to normal access automatically.

What is the safest recovery sequence in this situation? Specifically:

  • How can we bring the paused CSV back online without disrupting the running workloads
  • Should we move the CSV coordinator to another healthy node with Move-ClusterSharedVolume
  • Is there a recommended way to redistribute CSV coordinator ownership after recovery

I’d also like to know which cluster events or PowerShell checks are useful for confirming that the CSV is healthy before moving workloads back onto it.

Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
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  1. AI answer

    2026-08-18T06:35:27.7466667+00:00

    For a temporary cluster network interruption with CSV error 0xc000020c (STATUS_CONNECTION_DISCONNECTED), the safest sequence is to first confirm the cluster and storage paths have recovered, then bring the paused CSV back online, and only after that consider ownership redistribution.

    Recommended recovery sequence:

    1. In Failover Cluster Manager, verify the affected CSV status.
      • Open Start > Administrative tools > Failover Cluster Manager.
      • Expand the affected volume.
      • If the volume is offline or paused, use Bring this resource online.
    2. Verify CSV state in PowerShell.
      • Run: 
             Get-ClusterSharedVolume
      • This shows the status for the affected CSV and all CSVs in the cluster.
    3. Check for the underlying cause before moving anything.
      • For 0xc000020c, review System and Application event logs for communication interruptions between the node and the volume.
      • Also confirm cluster networking and storage connectivity are stable again.
    4. Validate the environment before placing more load on the CSV.
      • Make sure network and storage drivers and firmware are current.
      • Check for common causes of paused CSV state such as:
        • network bottlenecks or teaming mismatches
        • adapter resource exhaustion
        • physical disk or HBA failure
        • switch or cable faults
        • insufficient CSV capacity
        • unsupported filter drivers or multiple antivirus products

    About Move-ClusterSharedVolume:

    • Move-ClusterSharedVolume moves CSV ownership to a different node.
    • It is appropriate only after the CSV is healthy again.
    • It should not be the first recovery action for a paused CSV caused by a temporary network flap.
    • First restore normal CSV access and confirm health; then, if needed, move coordinator ownership to a healthy node.

    Example syntax:

    Move-ClusterSharedVolume -Name <CSVName> -Node <HealthyNode>

    Redistributing CSV coordinator ownership:

    • After recovery, coordinator ownership can be redistributed by moving the CSV to another healthy node.
    • The context confirms that CSV ownership is controlled by a particular node at any given time, and Move-ClusterSharedVolume is the supported cmdlet for changing that owner.
    • No specific balancing algorithm or redistribution pattern is provided in the context, so the supported guidance is to move ownership only after health is confirmed.

    Useful checks before moving workloads back:

    1. Failover Cluster Manager
      • Confirm the CSV is online.
      • Confirm the cluster is visible and manageable.
    2. PowerShell
      • Run: 
             Get-ClusterSharedVolume
      • Use this to confirm the CSV is present and no longer paused/offline.
    3. Event logs
      • Review System and Application logs for communication-related errors around the incident time.
      • For broader failover analysis, check Microsoft-Windows-FailoverClustering events and correlate timestamps with cluster logs.
      • Useful failover-related events called out in the guidance include 1069, 1146, and 1230.
    4. Cluster log review
      • In the cluster log, look for signs that the resource recovered successfully, such as:
        • Resource <name> has come online
        • Group move for <name> has completed
      • If recovery failed, look for:
        • Online for resource <name> failed

    If workloads were interrupted long enough, VMMS-managed VMs might need to be started manually after cluster recovery.

    References:

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  2. Harry Phan 31,865 Reputation points Independent Advisor
    2026-08-21T00:41:07.3133333+00:00

    Hello,

    The error code 0xc000020c indicates that the Cluster Shared Volume is paused due to a transient I/O or connectivity issue. Since your cluster networking has already recovered, the safest way forward is to resume the CSV without forcing ownership changes unless necessary.

    Start by running Get-ClusterSharedVolume in PowerShell and check the State property. If it shows Paused, you can issue Resume-ClusterResource -Name "<CSVName>" which will bring the CSV back online without disrupting workloads. This is the preferred method because it avoids unnecessary coordinator moves and keeps the running VMs attached to the same storage path.

    If the resume operation fails or the CSV remains inaccessible, then moving the CSV coordinator is valid. Use Move-ClusterSharedVolume -Name "<CSVName>" -Node <HealthyNode> to shift ownership. This forces the cluster to re-establish the I/O path through a healthy node. It’s safe to do this while workloads are running because CSV redirection will handle the transition, but you should expect a brief latency spike.

    Once the CSV is resumed or moved, you can redistribute coordinator ownership using Get-ClusterSharedVolume and Move-ClusterSharedVolume to balance load across nodes. Microsoft’s best practice is to spread CSV ownership evenly so that no single node is overloaded with metadata traffic.

    For validation, check the System and FailoverClustering event logs on the affected node. Look specifically for Event ID 5120 (indicating loss of access to a CSV volume) and Event ID 5142 (indicating recovery). In PowerShell, Get-ClusterSharedVolumeState will confirm the health status, and Get-ClusterResource -Name "<CSVName>" | Get-ClusterLog -TimeSpan 5 can provide detailed diagnostics. Also verify that redirected I/O has ceased by checking performance counters under Cluster CSV File System Driver.

    In summary: resume the CSV first, move ownership only if resume fails, then redistribute coordinators for balance. Confirm health with event logs and PowerShell checks before placing workloads back.

    I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!

    HP.

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