Add a note about copying PV/PVC from source to destination cluster

Author: pwschuurman

content/en/blog/_posts/2022-12-16-statefulset-migration.md

@@ -143,15 +143,14 @@ The following commands copy resources from `source` to `destionation`. Details
 that are not relevant in `destination` cluster are removed (eg: `uid`,
 `resourceVersion`, `status`).
 
-Note: For the PV/PVC, this procedure only works if the underlying storage system
-      that your `StorageClass` uses can support copying existing PVs into a
-      new cluster. Storage that is associated with a specific node or topology
-      may not be supported. Additionally, some storage systems may store
-      addtional metadata about volumes outside of a PV object, and may require
-      a more specialized sequence to import a volume.
-
 Source Cluster
 
+Note: If using a `StorageClass` with `reclaimPolicy: Delete` configured, you
+      should patch the PVs in `source` with `reclaimPolicy: Retain` prior to
+      deletion. See
+      [Change the Reclaim Policy of a PersistentVolume](/docs/tasks/administer-cluster/change-pv-reclaim-policy/)
+      for more details.
+
 ```
 kubectl get pvc redis-data-redis-redis-cluster-5 -o yaml | yq 'del(.metadata.uid, .metadata.resourceVersion, .metadata.annotations, .metadata.finalizers, .status)' > /tmp/pvc-redis-data-redis-redis-cluster-5.yaml
 kubectl get pv $(yq '.spec.volumeName' /tmp/pvc-redis-data-redis-redis-cluster-5.yaml) -o yaml | yq 'del(.metadata.uid, .metadata.resourceVersion, .metadata.annotations, .metadata.finalizers, .spec.claimRef, .status)' > /tmp/pv-redis-data-redis-redis-cluster-5.yaml
@@ -160,6 +159,13 @@ kubectl get secret redis-redis-cluster -o yaml | yq 'del(.metadata.uid, .metadat
 
 Destination Cluster
 
+Note: For the PV/PVC, this procedure only works if the underlying storage system
+      that your PVs use can support being copied into `destination`. Storage
+      that is associated with a specific node or topology may not be supported.
+      Additionally, some storage systems may store addtional metadata about
+      volumes outside of a PV object, and may require a more specialized
+      sequence to import a volume.
+
 ```
 kubectl create -f /tmp/pv-redis-data-redis-redis-cluster-5.yaml
 kubectl create -f /tmp/pvc-redis-data-redis-redis-cluster-5.yaml