Resize PVCs Dynamically in Kubernetes

Check if StorageClass supports expansion

kubectl get sc
# Look for ALLOWVOLUMEEXPANSION = true

Check current PVC size

kubectl get pvc data-loki-write-0 -n logging -o jsonpath='{.spec.resources.requests.storage}'

Patch the PVC to new size

kubectl patch pvc data-loki-write-0 -n logging \
  -p '{"spec":{"resources":{"requests":{"storage":"100Gi"}}}}'

Verify

kubectl get pvc data-loki-write-0 -n logging
# STATUS should stay "Bound", CAPACITY should update

Gotcha

• You can only increase size, never shrink
• Azure Disk CSI: online expansion works, no pod restart needed
• If PVC shows FileSystemResizePending condition, restart the pod using it
• Some older provisioners require the pod to be deleted so the volume can detach, resize, and reattach
• allowVolumeExpansion must be true on the StorageClass before you try to patch