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Volume Clone

In HwameiStor, users can create clone volume for data volumes that have the same data as the source volume at the moment the clone occurs.

note

Creating clones of non-HA volume is currently only supported, and only in-place cloning is supported.

Volume clone is implemented using snapshot technology. To avoid data inconsistency, please pause or stop I/O before cloning.

Follow the steps below to create and use clone volume.

1. Create Clone Volume​

You can create a pvc to perform a cloning operation on a data volume. The details are as follows:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
    name: hwameistor-lvm-volume-clone
spec:
  storageClassName: hwameistor-storage-lvm-ssd
  dataSource:
    # Bound data volumes must be provided
    name: data-sts-mysql-local-0
    kind: PersistentVolumeClaim
    apiGroup: ""
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

2. Use Clone Volume​

Use the following command to create an nginx application and use the data volume hwameistor-lvm-volume-clone:

cat << EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  namespace: default
spec:
  containers:
  - name: nginx
    image: docker.io/library/nginx:latest
    imagePullPolicy: IfNotPresent
    volumeMounts:
    - name: data
      mountPath: /data
    ports:
    - containerPort: 80
  volumes:
  - name: data
    persistentVolumeClaim:
      claimName: hwameistor-lvm-volume-clone
EOF