# Allow customer to set RBD storage class as the default storage class for the cluster

During odf installation via UI

for infra with already existing "default" SC (eg: say gp3-csi): option should be default unchecked. for infra with no "default" SC (BM here): option should be default checked.

Confirmation that the option was choosen


## Check the created storageclasses
RBD storageclass is showing as default

~ $ oc get storageclass
NAME                                    PROVISIONER                             RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
gp2-csi                                 ebs.csi.aws.com                         Delete          WaitForFirstConsumer   true                   89m
gp3-csi (default)                       ebs.csi.aws.com                         Delete          WaitForFirstConsumer   true                   89m
ocs-storagecluster-ceph-rbd (default)   openshift-storage.rbd.csi.ceph.com      Delete          Immediate              true                   4m
ocs-storagecluster-cephfs               openshift-storage.cephfs.csi.ceph.com   Delete          Immediate              true                   3m20s

If multiple storageclass are marked as default the latest one marked behaves as the default

## Check the annotations

~ $ oc get storageclass ocs-storagecluster-ceph-rbd -o=jsonpath='{.metadata.annotations}' | jq
{
  "description": "Provides RWO Filesystem volumes, and RWO and RWX Block volumes",
  "storageclass.kubernetes.io/is-default-class": "true"
}

The default storageclass annotation is present

## Check by creating a PVC without storageclass name

~ $ cat <<EOF | oc create -f -
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: rbd-pvc     
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi             
EOF

## Check if the pvc is bound to the default storageclass

~ $ oc get pvc | grep rbd-pvc
rbd-pvc                               Bound    pvc-becc1bb1-0634-426d-a98b-7a53a105e9fe   1Gi        RWO            ocs-storagecluster-ceph-rbd   3m25s