diff --git a/controllers/drain_controller_test.go b/controllers/drain_controller_test.go
new file mode 100644
index 000000000..7f500ffbf
--- /dev/null
+++ b/controllers/drain_controller_test.go
@@ -0,0 +1,126 @@
+package controllers
+
+import (
+	goctx "context"
+	"time"
+
+	v1 "k8s.io/api/core/v1"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+
+	sriovnetworkv1 "github.com/k8snetworkplumbingwg/sriov-network-operator/api/v1"
+	consts "github.com/k8snetworkplumbingwg/sriov-network-operator/pkg/consts"
+	"github.com/k8snetworkplumbingwg/sriov-network-operator/pkg/utils"
+	"github.com/k8snetworkplumbingwg/sriov-network-operator/test/util"
+)
+
+func createNode(name, anno string) *v1.Node {
+	node := &v1.Node{}
+	node.Name = name
+	node.Annotations = map[string]string{}
+	node.Annotations[consts.NodeDrainAnnotation] = anno
+
+	Expect(k8sClient.Create(goctx.TODO(), node)).Should(Succeed())
+	return node
+}
+
+var _ = Describe("Drain Controller", func() {
+
+	Context("Parallel nodes draining", func() {
+
+		It("Should drain one node", func() {
+			node1 := createNode("node1", "Drain_Required")
+			node2 := createNode("node2", "Drain_Required")
+
+			config := &sriovnetworkv1.SriovOperatorConfig{}
+			err := util.WaitForNamespacedObject(config, k8sClient, testNamespace, "default", interval, timeout)
+			Expect(err).NotTo(HaveOccurred())
+			config.Spec = sriovnetworkv1.SriovOperatorConfigSpec{
+				MaxParallelNodeConfiguration: 1,
+			}
+			updateErr := k8sClient.Update(goctx.TODO(), config)
+			Expect(updateErr).NotTo(HaveOccurred())
+			time.Sleep(3 * time.Second)
+
+			nodeList := &v1.NodeList{}
+			listErr := k8sClient.List(ctx, nodeList)
+			Expect(listErr).NotTo(HaveOccurred())
+
+			drainingNodes := 0
+			for _, node := range nodeList.Items {
+				if utils.NodeHasAnnotation(node, "sriovnetwork.openshift.io/state", "Draining") {
+					drainingNodes++
+				}
+			}
+			Expect(drainingNodes).To(Equal(1))
+
+			err = k8sClient.Delete(goctx.TODO(), node1)
+			Expect(err).NotTo(HaveOccurred())
+			err = k8sClient.Delete(goctx.TODO(), node2)
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It("Should drain two nodes", func() {
+			node1 := createNode("node1", "Drain_Required")
+			node2 := createNode("node2", "Drain_Required")
+
+			config := &sriovnetworkv1.SriovOperatorConfig{}
+			err := util.WaitForNamespacedObject(config, k8sClient, testNamespace, "default", interval, timeout)
+			Expect(err).NotTo(HaveOccurred())
+			config.Spec = sriovnetworkv1.SriovOperatorConfigSpec{
+				MaxParallelNodeConfiguration: 2,
+			}
+			updateErr := k8sClient.Update(goctx.TODO(), config)
+			Expect(updateErr).NotTo(HaveOccurred())
+			time.Sleep(3 * time.Second)
+
+			nodeList := &v1.NodeList{}
+			listErr := k8sClient.List(ctx, nodeList)
+			Expect(listErr).NotTo(HaveOccurred())
+
+			drainingNodes := 0
+			for _, node := range nodeList.Items {
+				Expect(utils.NodeHasAnnotation(node, "sriovnetwork.openshift.io/state", "Draining")).To(BeTrue())
+			}
+			Expect(drainingNodes).To(Equal(1))
+
+			err = k8sClient.Delete(goctx.TODO(), node1)
+			Expect(err).NotTo(HaveOccurred())
+			err = k8sClient.Delete(goctx.TODO(), node2)
+			Expect(err).NotTo(HaveOccurred())
+
+		})
+
+		It("Should drain all nodes", func() {
+			node1 := createNode("node1", "Drain_Required")
+			node2 := createNode("node2", "Drain_Required")
+
+			config := &sriovnetworkv1.SriovOperatorConfig{}
+			err := util.WaitForNamespacedObject(config, k8sClient, testNamespace, "default", interval, timeout)
+			Expect(err).NotTo(HaveOccurred())
+			config.Spec = sriovnetworkv1.SriovOperatorConfigSpec{
+				MaxParallelNodeConfiguration: 0,
+			}
+			updateErr := k8sClient.Update(goctx.TODO(), config)
+			Expect(updateErr).NotTo(HaveOccurred())
+			time.Sleep(3 * time.Second)
+
+			nodeList := &v1.NodeList{}
+			listErr := k8sClient.List(ctx, nodeList)
+			Expect(listErr).NotTo(HaveOccurred())
+
+			drainingNodes := 0
+			for _, node := range nodeList.Items {
+				Expect(utils.NodeHasAnnotation(node, "sriovnetwork.openshift.io/state", "Draining")).To(BeTrue())
+			}
+			Expect(drainingNodes).To(Equal(1))
+
+			err = k8sClient.Delete(goctx.TODO(), node1)
+			Expect(err).NotTo(HaveOccurred())
+			err = k8sClient.Delete(goctx.TODO(), node2)
+			Expect(err).NotTo(HaveOccurred())
+
+		})
+	})
+})
diff --git a/pkg/daemon/daemon.go b/pkg/daemon/daemon.go
index 4c653a17d..bfe25fd27 100644
--- a/pkg/daemon/daemon.go
+++ b/pkg/daemon/daemon.go
@@ -38,6 +38,7 @@ import (
 	sriovnetworkv1 "github.com/k8snetworkplumbingwg/sriov-network-operator/api/v1"
 	snclientset "github.com/k8snetworkplumbingwg/sriov-network-operator/pkg/client/clientset/versioned"
 	sninformer "github.com/k8snetworkplumbingwg/sriov-network-operator/pkg/client/informers/externalversions"
+	consts "github.com/k8snetworkplumbingwg/sriov-network-operator/pkg/consts"
 	plugin "github.com/k8snetworkplumbingwg/sriov-network-operator/pkg/plugins"
 	"github.com/k8snetworkplumbingwg/sriov-network-operator/pkg/utils"
 )
@@ -562,7 +563,7 @@ func (dn *Daemon) nodeStateSyncHandler() error {
 // isNodeDraining: check if the node is draining
 // both Draining and MCP paused labels will return true
 func (dn *Daemon) isNodeDraining() bool {
-	anno, ok := dn.node.Annotations[annoKey]
+	anno, ok := dn.node.Annotations[consts.NodeDrainAnnotation]
 	if !ok {
 		return false
 	}
@@ -689,8 +690,8 @@ func (dn *Daemon) annotateNode(node, value string) error {
 	if newNode.Annotations == nil {
 		newNode.Annotations = map[string]string{}
 	}
-	if newNode.Annotations[annoKey] != value {
-		newNode.Annotations[annoKey] = value
+	if newNode.Annotations[consts.NodeDrainAnnotation] != value {
+		newNode.Annotations[consts.NodeDrainAnnotation] = value
 		newData, err := json.Marshal(newNode)
 		if err != nil {
 			return err