diff --git a/pkg/operator/ceph/cluster/mon/mon.go b/pkg/operator/ceph/cluster/mon/mon.go
index aa1a817b1..93ab03a1e 100644
--- a/pkg/operator/ceph/cluster/mon/mon.go
+++ b/pkg/operator/ceph/cluster/mon/mon.go
@@ -502,11 +502,6 @@ func (c *Cluster) ensureMonsRunning(mons []*monConfig, i, targetCount int, requi
 		return errors.Wrap(err, "failed to save mons")
 	}
 
-	// make sure we have the connection info generated so connections can happen
-	if err := WriteConnectionConfig(c.context, c.ClusterInfo); err != nil {
-		return err
-	}
-
 	// Start the deployment
 	if err := c.startDeployments(mons[0:expectedMonCount], requireAllInQuorum); err != nil {
 		return errors.Wrap(err, "failed to start mon pods")
@@ -1056,6 +1051,29 @@ func (c *Cluster) waitForMonsToJoin(mons []*monConfig, requireAllInQuorum bool)
 }
 
 func (c *Cluster) saveMonConfig() error {
+	if err := c.persistExpectedMonDaemons(); err != nil {
+		return errors.Wrap(err, "failed to persist expected mons")
+	}
+
+	// Every time the mon config is updated, must also update the global config so that all daemons
+	// have the most updated version if they restart.
+	if err := config.GetStore(c.context, c.Namespace, c.ownerInfo).CreateOrUpdate(c.ClusterInfo); err != nil {
+		return errors.Wrap(err, "failed to update the global config")
+	}
+
+	// write the latest config to the config dir
+	if err := WriteConnectionConfig(c.context, c.ClusterInfo); err != nil {
+		return errors.Wrap(err, "failed to write connection config for new mons")
+	}
+
+	if err := csi.SaveClusterConfig(c.context.Clientset, c.Namespace, c.ClusterInfo, c.csiConfigMutex); err != nil {
+		return errors.Wrap(err, "failed to update csi cluster config")
+	}
+
+	return nil
+}
+
+func (c *Cluster) persistExpectedMonDaemons() error {
 	ctx := context.TODO()
 	configMap := &v1.ConfigMap{
 		ObjectMeta: metav1.ObjectMeta{
@@ -1067,7 +1085,6 @@ func (c *Cluster) saveMonConfig() error {
 	if err != nil {
 		return errors.Wrapf(err, "failed to set owner reference mon configmap %q", configMap.Name)
 	}
-
 	monMapping, err := json.Marshal(c.mapping)
 	if err != nil {
 		return errors.Wrap(err, "failed to marshal mon mapping")
@@ -1106,24 +1123,7 @@ func (c *Cluster) saveMonConfig() error {
 			return errors.Wrap(err, "failed to update mon endpoint config map")
 		}
 	}
-
 	logger.Infof("saved mon endpoints to config map %+v", configMap.Data)
-
-	// Every time the mon config is updated, must also update the global config so that all daemons
-	// have the most updated version if they restart.
-	if err := config.GetStore(c.context, c.Namespace, c.ownerInfo).CreateOrUpdate(c.ClusterInfo); err != nil {
-		return errors.Wrap(err, "failed to update the global config")
-	}
-
-	// write the latest config to the config dir
-	if err := WriteConnectionConfig(c.context, c.ClusterInfo); err != nil {
-		return errors.Wrap(err, "failed to write connection config for new mons")
-	}
-
-	if err := csi.SaveClusterConfig(c.context.Clientset, c.Namespace, c.ClusterInfo, c.csiConfigMutex); err != nil {
-		return errors.Wrap(err, "failed to update csi cluster config")
-	}
-
 	return nil
 }
 
@@ -1337,6 +1337,12 @@ func (c *Cluster) startMon(m *monConfig, schedule *MonScheduleInfo) error {
 		return errors.Wrapf(err, "failed to commit maxMonId after starting mon %q", m.DaemonName)
 	}
 
+	// Persist the expected list of mons to the configmap in case the operator is interrupted before the mon failover is completed
+	// The config on disk won't be updated until the mon failover is completed
+	if err := c.persistExpectedMonDaemons(); err != nil {
+		return errors.Wrap(err, "failed to persist expected mon daemons")
+	}
+
 	return nil
 }
 
diff --git a/pkg/operator/ceph/cluster/mon/mon_test.go b/pkg/operator/ceph/cluster/mon/mon_test.go
index 5ec65b27f..3df90b419 100644
--- a/pkg/operator/ceph/cluster/mon/mon_test.go
+++ b/pkg/operator/ceph/cluster/mon/mon_test.go
@@ -231,6 +231,31 @@ func validateStart(ctx context.Context, t *testing.T, c *Cluster) {
 	assert.NoError(t, err)
 }
 
+func TestPersistMons(t *testing.T) {
+	clientset := test.New(t, 1)
+	ownerInfo := cephclient.NewMinimumOwnerInfoWithOwnerRef()
+	c := New(&clusterd.Context{Clientset: clientset}, "ns", cephv1.ClusterSpec{}, ownerInfo, &sync.Mutex{})
+	setCommonMonProperties(c, 1, cephv1.MonSpec{Count: 3, AllowMultiplePerNode: true}, "myversion")
+
+	// Persist mon a
+	err := c.persistExpectedMonDaemons()
+	assert.NoError(t, err)
+
+	cm, err := c.context.Clientset.CoreV1().ConfigMaps(c.Namespace).Get(context.TODO(), EndpointConfigMapName, metav1.GetOptions{})
+	assert.NoError(t, err)
+	assert.Equal(t, "a=1.2.3.1:6789", cm.Data[EndpointDataKey])
+
+	// Persist mon b, and remove mon a for simply testing the configmap is updated
+	c.ClusterInfo.Monitors["b"] = &cephclient.MonInfo{Name: "b", Endpoint: "4.5.6.7:3300"}
+	delete(c.ClusterInfo.Monitors, "a")
+	err = c.persistExpectedMonDaemons()
+	assert.NoError(t, err)
+
+	cm, err = c.context.Clientset.CoreV1().ConfigMaps(c.Namespace).Get(context.TODO(), EndpointConfigMapName, metav1.GetOptions{})
+	assert.NoError(t, err)
+	assert.Equal(t, "b=4.5.6.7:3300", cm.Data[EndpointDataKey])
+}
+
 func TestSaveMonEndpoints(t *testing.T) {
 	ctx := context.TODO()
 	clientset := test.New(t, 1)