diff --git a/pkg/client/client.go b/pkg/client/client.go
index 96086c5..cb3d2a9 100644
--- a/pkg/client/client.go
+++ b/pkg/client/client.go
@@ -35,6 +35,13 @@ type Server struct {
 	DatacenterID string
 }
 
+type Volume struct {
+	ID           string
+	Name         string
+	ServerID     string
+	DatacenterID string
+}
+
 func New(datacenterId string, secret []byte) (IONOSClient, error) {
 	var cfg *ionoscloud.Configuration
 	if secret[0] == '{' {
@@ -72,6 +79,35 @@ func (a *IONOSClient) GetServer(ctx context.Context, providerID string) (*cloudp
 	return a.convertServerToInstanceMetadata(ctx, &server)
 }
 
+func (a *IONOSClient) GetServerVolumes(ctx context.Context, providerID string) ([]Volume, error) {
+	if a.client == nil {
+		return nil, errors.New("client isn't initialized")
+	}
+	volumesReq := a.client.ServersApi.DatacentersServersVolumesGet(ctx, a.DatacenterId, providerID)
+	volumes, req, err := volumesReq.Depth(1).Execute()
+	if err != nil || req != nil && req.StatusCode == 404 {
+		if err != nil {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	var list []Volume
+
+	for _, volume := range *volumes.Items {
+		if volume.Properties == nil {
+			continue
+		}
+		list = append(list, Volume{
+			DatacenterID: a.DatacenterId,
+			ServerID:     providerID,
+			ID:           *volume.Id,
+			Name:         *volume.Properties.Name,
+		})
+	}
+	return list, nil
+}
+
 func (a *IONOSClient) RemoveIPFromNode(ctx context.Context, loadBalancerIP, providerID string) error {
 	if a.client == nil {
 		return errors.New("client isn't initialized")
diff --git a/pkg/ionos/instances.go b/pkg/ionos/instances.go
index c4fa75a..1b628c2 100644
--- a/pkg/ionos/instances.go
+++ b/pkg/ionos/instances.go
@@ -1,79 +1,100 @@
 package ionos
 
 import (
-	"context"
-	"errors"
-	"fmt"
-	"strings"
+    "context"
+    "errors"
+    "fmt"
+    "strings"
 
-	v1 "k8s.io/api/core/v1"
-	cloudprovider "k8s.io/cloud-provider"
-	"k8s.io/klog/v2"
+    v1 "k8s.io/api/core/v1"
+    cloudprovider "k8s.io/cloud-provider"
+    "k8s.io/klog/v2"
 
-	client2 "github.com/GDATASoftwareAG/cloud-provider-ionoscloud/pkg/client"
-	"github.com/GDATASoftwareAG/cloud-provider-ionoscloud/pkg/config"
+    client2 "github.com/GDATASoftwareAG/cloud-provider-ionoscloud/pkg/client"
+    "github.com/GDATASoftwareAG/cloud-provider-ionoscloud/pkg/config"
 )
 
 var _ cloudprovider.InstancesV2 = &instances{}
 
 func GetUUIDFromNode(node *v1.Node) string {
-	if node == nil {
-		return ""
-	}
-	withoutPrefix := strings.TrimPrefix(node.Spec.ProviderID, config.ProviderPrefix)
-	return strings.ToLower(strings.TrimSpace(withoutPrefix))
+    if node == nil {
+        return ""
+    }
+    return ProviderIDWitPrefix(node.Spec.ProviderID)
+}
+
+func ProviderIDWitPrefix(providerID string) string {
+    withoutPrefix := strings.TrimPrefix(providerID, config.ProviderPrefix)
+    return strings.ToLower(strings.TrimSpace(withoutPrefix))
 }
 
 func (i instances) AddClient(datacenterId string, token []byte) error {
-	if i.ionosClients[datacenterId] == nil {
-		c, err := client2.New(datacenterId, token)
-		if err != nil {
-			return err
-		}
-		i.ionosClients[datacenterId] = &c
-	}
-	return nil
+    if i.ionosClients[datacenterId] == nil {
+        c, err := client2.New(datacenterId, token)
+        if err != nil {
+            return err
+        }
+        i.ionosClients[datacenterId] = &c
+    }
+    return nil
 }
 
 // no caching
-func (i instances) discoverNode(ctx context.Context, node *v1.Node) (*cloudprovider.InstanceMetadata, error) {
-	for _, client := range i.ionosClients {
-		var err error
-		var server *cloudprovider.InstanceMetadata
-		providerID := GetUUIDFromNode(node)
-		klog.Infof("discoverNode (datacenterId %s) %s %s", client.DatacenterId, node.Name, providerID)
-		if providerID != "" {
-			server, err = client.GetServer(ctx, providerID)
-		} else {
-			server, err = client.GetServerByName(ctx, node.Name)
-		}
-		if err != nil {
-			return nil, fmt.Errorf("failed to discoverNode %v", err)
-		}
-		if server == nil {
-			continue
-		}
-		return server, nil
-	}
-	return nil, errors.New("failed to discoverNode")
+func (i instances) discoverNode(ctx context.Context, node *v1.Node) (*cloudprovider.InstanceMetadata, *client2.IONOSClient, error) {
+    for _, client := range i.ionosClients {
+        var err error
+        var server *cloudprovider.InstanceMetadata
+        providerID := GetUUIDFromNode(node)
+        klog.Infof("discoverNode (datacenterId %s) %s %s", client.DatacenterId, node.Name, providerID)
+        if providerID != "" {
+            server, err = client.GetServer(ctx, providerID)
+        } else {
+            server, err = client.GetServerByName(ctx, node.Name)
+        }
+        if err != nil {
+            return nil, nil, fmt.Errorf("failed to discoverNode %v", err)
+        }
+        if server == nil {
+            continue
+        }
+        return server, client, nil
+    }
+    return nil, nil, nil
 }
 
 func (i instances) InstanceExists(ctx context.Context, node *v1.Node) (bool, error) {
-	klog.Infof("InstanceExists %s", node.Name)
-	server, err := i.discoverNode(ctx, node)
-	klog.InfoDepth(1, server)
-	return server != nil, err
+    klog.Infof("InstanceExists %s", node.Name)
+    server, _, err := i.discoverNode(ctx, node)
+    klog.InfoDepth(1, server)
+    return server != nil, err
 }
 
-func (i instances) InstanceShutdown(_ context.Context, node *v1.Node) (bool, error) {
-	klog.Infof("InstanceShutdown %s", node.Name)
-	// TODO check here for mounted volumes
-	return true, nil
+func (i instances) InstanceShutdown(ctx context.Context, node *v1.Node) (bool, error) {
+    klog.Infof("InstanceShutdown %s", node.Name)
+    server, client, err := i.discoverNode(ctx, node)
+    if (server == nil && err == nil) || server == nil {
+        return true, nil
+    }
+
+    volumes, err := client.GetServerVolumes(ctx, ProviderIDWitPrefix(server.ProviderID))
+    if err != nil {
+        return false, err
+    }
+
+    for _, volume := range volumes {
+        if strings.HasPrefix(volume.Name, "csi-pv.k8s.") {
+            return false, nil
+        }
+    }
+    return true, nil
 }
 
 func (i instances) InstanceMetadata(ctx context.Context, node *v1.Node) (*cloudprovider.InstanceMetadata, error) {
-	klog.Infof("InstanceMetadata %s", node.Name)
-	server, err := i.discoverNode(ctx, node)
-	klog.InfoDepth(1, server)
-	return server, err
+    klog.Infof("InstanceMetadata %s", node.Name)
+    server, _, err := i.discoverNode(ctx, node)
+    if server == nil && err == nil {
+        return nil, errors.New("failed to discoverNode")
+    }
+    klog.InfoDepth(1, server)
+    return server, err
 }