Managing a PVC

Based on service requirements, files in containers need to be persistently stored on disks. When the containers are re-built or re-allocated to new nodes, the persistent data can still be used.

To persistently store data on storage devices, you need to use the PersistentVolume (PV) and PersistentVolumeClaim (PVC) when provisioning containers.

• PV: a piece of storage in the Kubernetes cluster that has been provisioned by an administrator or dynamically provisioned using a StorageClass.
• PVC: a request for storage by a user. A PVC consumes PV resources. A PVC can request specific size and access modes. For example, a PV can be mounted in ReadWriteOnce, ReadOnlyMany, or ReadWriteMany mode. For details, see Access Modes.

This section describes how to use Huawei CSI to create, expand the capacity of, and clone a PV/PVC, as well as create a PVC using a snapshot.