PVC Read-Back Test¶

A minimal workload that writes a file to a PersistentVolumeClaim, then spins up a second pod that mounts the same PVC and reads the file back. This validates end-to-end that the CSI driver, StorageClass, and persistent storage are functioning correctly.

Prerequisites¶

Storage configured with a default StorageClass

Deploy¶

Create a namespace:
```
oc new-project pvc-readback
```

Create the PersistentVolumeClaim:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: readback-pvc
  namespace: pvc-readback
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

oc apply -f readback-pvc.yaml

Run a pod that writes a file to the PVC:

apiVersion: v1
kind: Pod
metadata:
  name: pvc-writer
  namespace: pvc-readback
spec:
  restartPolicy: Never
  containers:
    - name: writer
      image: registry.redhat.io/ubi9/ubi-minimal
      command:
        - sh
        - -c
        - |
          echo "Hello from OpenShift PVC test - written at $(date)" > /data/testfile.txt
          echo "File written successfully."
      volumeMounts:
        - name: data
          mountPath: /data
  volumes:
    - name: data
      persistentVolumeClaim:
        claimName: readback-pvc

oc apply -f pvc-writer.yaml

Wait for the writer pod to complete:
```
oc get pod pvc-writer -n pvc-readback -w
```
The pod should reach Completed status. Confirm the write succeeded:
```
oc logs pvc-writer -n pvc-readback
```

Run a second pod that reads the file back from the same PVC:

apiVersion: v1
kind: Pod
metadata:
  name: pvc-reader
  namespace: pvc-readback
spec:
  restartPolicy: Never
  containers:
    - name: reader
      image: registry.redhat.io/ubi9/ubi-minimal
      command:
        - sh
        - -c
        - |
          echo "Reading file from PVC:"
          cat /data/testfile.txt
      volumeMounts:
        - name: data
          mountPath: /data
          readOnly: true
  volumes:
    - name: data
      persistentVolumeClaim:
        claimName: readback-pvc

oc apply -f pvc-reader.yaml

Verify the reader pod can see the data:

oc logs pvc-reader -n pvc-readback

You should see:

Reading file from PVC:
Hello from OpenShift PVC test - written at <timestamp>

What This Validates¶

PVC provisioning — the StorageClass dynamically provisions a volume
Data persistence — data written by one pod is available to another pod mounting the same PVC
CSI driver functionality — the full attach/mount/read/write path works end-to-end

Cleanup¶

oc delete project pvc-readback