diff --git a/postgres/app/helmrelease.yaml b/postgres/app/helmrelease.yaml
index 97c2c3c..f44b8b5 100644
--- a/postgres/app/helmrelease.yaml
+++ b/postgres/app/helmrelease.yaml
@@ -34,7 +34,9 @@ spec:
       instances: 3
       storage:
         size: 10Gi
-        storageClass: ocs-storagecluster-ceph-rbd
+        # default storage class on ai-2 cluster, on basel or staging you
+        # should use 'ocs-storagecluster-ceph-rbd' instead
+        storageClass: ibm-spectrum-scale-fileset
       walStorage:
         # It's not mandatory to split WAL from the main data volume. 
         # However, doing so helps to avoid issues with the main data volume 
@@ -44,8 +46,8 @@ spec:
         # to the point where the volume fills up, blocking the cluster from
         # operating properly.
         enabled: true 
-        size: 10Gi 
-        storageClass: ocs-storagecluster-ceph-rbd
+        size: 10Gi
+        storageClass: ibm-spectrum-scale-fileset
       resources:
         requests:
           cpu: "500m"