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@Vinay Donthula This mostly happens when you try to delete the volumes prior to properly deleting the ClickHouse Instance i.e. chi resource. You can resolve this by patching the PVCs in the namespace:

kubectl get -n platform pvc -o=name | xargs kubectl patch \
  -n platform \
  -p '{"metadata":{"finalizers":[]}}' --type=merge

Thanks, @Prashant Shahi - it worked..!!!