# Persistent Storage

FPTCloud's Managed FKE product provides a block storage (CSI – Container Storage Interface) solution, supporting users to store, read, and write data at desired speeds using . Managed FKE clusters provide a default storage class using policy disks similar to <mark style="color:red;">**worker pool worker group-based**</mark> policy disks. FPTCloud's CSI supports online volume resizing.

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&#x20;Users can create PVCs (persistent volume claims) using these storage classes and build applications that utilize these PVCs.

&#x20;If users wish to create a new storage class with a different policy disk type, proceed as follows:

* Save the default storage class configuration.
* Modify the policy disk.
* Rename the storage class.
* Remove the annotation for the default storage class.

&#x20;*Do not modify the cluster's default storage class configuration. If a user changes this setting, it will automatically roll back to the default configuration. To use a new storage class, you must specify the \`storageClassName\` in the PersistentVolumeClaim configuration.*


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