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Identify the stage that is failing
A PVC’s state is a starting point, not a complete diagnosis. A claim can be unbound, bound while its Pod cannot use it, or apparently healthy in Kubernetes while the storage system has a problem. Use the events and objects at each layer to narrow down the failure before changing resources.
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| What you see | Where to investigate next |
|---|---|
| PVC is Pending | Matching PV availability, StorageClass settings, requested access mode and capacity, topology requirements, and the provisioner’s events or logs. |
| PVC is Bound, but the Pod cannot use the volume | Pod scheduling and events, node health, CSI controller and node components, mount options, and backend attachment or access restrictions. |
| Snapshot or expansion is stalled | The relevant snapshot or PVC status and events, class and driver support, and the storage provider’s operation state. |
| Kubernetes objects look healthy, but data is unavailable or degraded | CSI health reports, if configured, and the storage backend’s own health and recovery tools. |
Record the current state before making changes
Capture the namespace, PVC and PV names, consuming Pod, selected node, StorageClass, Kubernetes version, CSI driver and sidecar versions, and the exact event or error text. This gives you a baseline for comparing what changes during recovery and for matching instructions to the deployed versions.
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List claims and volumes:
kubectl get pvc,pv -A. -
Inspect the claim and its conditions and events:
kubectl describe pvc <claim> -n <namespace>.#1 Best Overall
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Inspect the associated PV and its reclaim policy:
kubectl describe pv <volume>. -
Inspect the consuming Pod’s scheduling and volume events:
kubectl describe pod <pod> -n <namespace>. -
Review the relevant StorageClass:
kubectl get storageclass <class> -o yaml. Adapt command scope and permissions to your cluster.The Tool Desk
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Do not delete the PVC as a diagnostic shortcut. For dynamically provisioned PVs, the StorageClass reclaim policy is inherited when the volume is created. If the PV’s policy is Delete, deleting the claim can also delete the underlying storage asset; Retain preserves it for manual recovery.
If the PVC is Pending, check binding and provisioning
When Kubernetes cannot find a matching PV
Compare the claim’s requested storage class, access mode, and capacity with available PVs. Check the PVC and PV events for clues such as an unmet requirement or incompatibility. A volume that exists is not necessarily a match for the claim.
When dynamic provisioning is expected
Inspect the StorageClass’s provisioner and parameters, along with any capacity or topology constraints. Then check the relevant provisioner’s events and logs to distinguish a claim that does not meet the class requirements from a provisioning request that reached the backend but failed there. The exact component names and log locations vary by CSI deployment.
If the PVC is Bound but the Pod cannot mount it
Bound confirms that a claim has a volume assignment; it does not establish that the volume attached to the Pod’s node or mounted successfully. Use the Pod events to identify whether the problem occurs during scheduling, attach, mount, or container startup.
- Scheduling: Check whether the Pod is assigned to a node and whether the volume’s topology or access constraints are compatible with that placement.
- Attach: Check node health, the CSI controller and node components, and the provider’s attachment state. Look for conflicts such as an existing attachment or an access-mode limit.
- Mount: Confirm that the CSI node driver is installed and functioning on the selected node. Review mount errors, backend data-path availability, and the StorageClass or PV mount options.
- Application startup: If attach and mount completed, distinguish a volume recovery issue from an application-level startup or data-consistency problem.
Kubernetes does not validate mount options before passing them to the storage integration, so an invalid option can cause a mount failure. Reattachment after some node failures is possible, but it does not cover every backend or failure mode; use the provider’s documented procedure for the specific storage system.
Use CSI health reports as signals, not as automatic repair
Kubernetes CSI volume-health reporting is conditional: the feature gate and the relevant driver and monitor-sidecar support must be configured. When available, node and controller reports are independent and can describe states such as Inaccessible, DataLoss, Degraded, StorageUnreachable, or StorageDegraded.
Kubernetes exposes those reports; it does not automatically reschedule Pods, fail over volumes, or otherwise remediate the reported condition. If health fields are absent, verify driver support and deployment configuration rather than treating missing reports as proof that the backend is healthy.
Protect data during claim, snapshot, and volume recovery
Recovering a volume after its PVC was deleted
First determine whether the backend storage still exists and check the PV’s reclaim policy. A PV with Retain enters the Released phase after its claim is deleted; it is not automatically ready for an unrelated claim. If reusing it, reserve it for the intended claim with claimRef and verify the PV and PVC identities before allowing a workload to write. Follow the CSI driver and provider’s recovery instructions for any backend-specific steps.
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Handling snapshots safely
Before deleting a VolumeSnapshot, inspect its deletion policy: it determines whether deleting the Kubernetes snapshot also deletes the underlying snapshot content. A PVC deletion can also be delayed while snapshot creation is in progress because of source-protection behavior. Consider whether the provider’s own backup or snapshot mechanism is needed in addition to Kubernetes VolumeSnapshot objects.
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Treat expansion failures separately from mount or recovery failures
Volume expansion requires the StorageClass to allow it and support from the CSI driver and storage system. Inspect the PVC’s status and events, confirm the provider can supply the requested capacity, and follow its capacity guidance before retrying. Kubernetes volume expansion is for growth; it does not shrink a PVC below its current size.
Check versions before applying a reclaim-policy fix
For a PV or storage asset that disappeared unexpectedly, record the sequence of deletion and identify the Kubernetes and CSI external-provisioner versions. Kubernetes v1.31 release guidance describes a change to CSI PV deletion order and specifies Kubernetes v1.31 with external-provisioner v5.0.1 or later for the newer behavior. That version-specific guidance is not a general fix for other Kubernetes versions, drivers, or backends; check the documentation matching the deployed combination before changing reclaim behavior.
Choose a recovery path by risk and evidence
When more than one recovery option is supported, compare them against the actual failure and application needs:
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- Data-loss risk and reversibility: Prefer a path that preserves the existing backend data and can be reversed while the cause is still uncertain.
- Failure layer: Distinguish Kubernetes binding from CSI attach or mount and from a backend fault; a Kubernetes resource change will not necessarily repair a provider-side problem.
- Recoverable copies: Check whether an existing snapshot or backup can be restored and whether it is consistent enough for the application.
- Compatibility: Match instructions to the Kubernetes, CSI driver, sidecar, and backend versions actually deployed.
- Service impact: Account for the application’s downtime and data-consistency requirements before detaching, restoring, or redirecting a volume.
Once the failure is isolated, follow the CSI driver’s and storage provider’s documented recovery procedure, then verify the resulting PV/PVC state, Pod events, mount, and application access before returning the workload to service.
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