diff --git a/pkg/azuredisk/azure_controller_common.go b/pkg/azuredisk/azure_controller_common.go
index e2240ea832..26fd6f0d5f 100644
--- a/pkg/azuredisk/azure_controller_common.go
+++ b/pkg/azuredisk/azure_controller_common.go
@@ -132,7 +132,7 @@ func (c *controllerCommon) AttachDisk(ctx context.Context, diskName, diskURI str
 			if err != nil {
 				return -1, err
 			}
-			if isSameNode(string(nodeName), string(attachedNode)) {
+			if strings.EqualFold(string(nodeName), string(attachedNode)) {
 				klog.Warningf("volume %s is actually attached to current node %s, invalidate vm cache and return error", diskURI, nodeName)
 				// update VM(invalidate vm cache)
 				if errUpdate := c.UpdateVM(ctx, nodeName); errUpdate != nil {
diff --git a/pkg/azuredisk/azuredisk.go b/pkg/azuredisk/azuredisk.go
index 0fb06ddaf4..5cf65726d7 100644
--- a/pkg/azuredisk/azuredisk.go
+++ b/pkg/azuredisk/azuredisk.go
@@ -786,38 +786,3 @@ func checkAllocatable(ctx context.Context, clientset kubernetes.Interface, nodeN
 
 	return fmt.Errorf("isAllocatableSet: driver not found on node %s", nodeName)
 }
-
-// isSameNode checks whether node1 and node2 are the same node
-func isSameNode(node1, node2 string) bool {
-	if strings.EqualFold(node1, node2) {
-		return true
-	}
-	// check whether node1 and node2 are VMSS instance name
-	if len(node1) < 6 || len(node2) < 6 {
-		return false
-	}
-
-	// machineName is composed of computerNamePrefix and 36-based instanceID.
-	// And instanceID part if in fixed length of 6 characters.
-	// Refer https://msftstack.wordpress.com/2017/05/10/figuring-out-azure-vm-scale-set-machine-names/.
-	if strings.EqualFold(node1[:len(node1)-6], node2[:len(node2)-6]) {
-		// check whether node1 is 36-based instanceID and node2 is 10-based instanceID
-		id1, err := strconv.ParseUint(node1[len(node1)-6:], 36, 64)
-		if err == nil {
-			id2, err := strconv.ParseUint(node2[len(node2)-6:], 10, 64)
-			if err == nil && id1 == id2 {
-				return true
-			}
-		}
-
-		// check whether node1 is 10-based instanceID and node2 is 36-based instanceID
-		id1, err = strconv.ParseUint(node1[len(node1)-6:], 10, 64)
-		if err == nil {
-			id2, err := strconv.ParseUint(node2[len(node2)-6:], 36, 64)
-			if err == nil && id1 == id2 {
-				return true
-			}
-		}
-	}
-	return false
-}
diff --git a/pkg/azuredisk/azuredisk_test.go b/pkg/azuredisk/azuredisk_test.go
index 40c8f48be9..c1ba86e950 100644
--- a/pkg/azuredisk/azuredisk_test.go
+++ b/pkg/azuredisk/azuredisk_test.go
@@ -589,79 +589,3 @@ func TestGetUsedLunsFromNode(t *testing.T) {
 		}
 	}
 }
-
-func TestIsSameNode(t *testing.T) {
-	tests := []struct {
-		name          string
-		nodeName      string
-		nodeName2     string
-		expectedValue bool
-	}{
-		{
-			name:          "same node",
-			nodeName:      "test-node",
-			nodeName2:     "test-node",
-			expectedValue: true,
-		},
-		{
-			name:          "different node with shorter name",
-			nodeName:      "node1",
-			nodeName2:     "node2",
-			expectedValue: false,
-		},
-		{
-			name:          "different node",
-			nodeName:      "test-node",
-			nodeName2:     "test-node2",
-			expectedValue: false,
-		},
-		{
-			name:          "empty node",
-			nodeName:      "",
-			nodeName2:     "test-node",
-			expectedValue: false,
-		},
-		{
-			name:          "node1 is 10 based instance name, node2 is 36 based instance name",
-			nodeName:      "aks-agentpool-20657377-vmss000012",
-			nodeName2:     "aks-agentpool-20657377-vmss00000c",
-			expectedValue: true,
-		},
-		{
-			name:          "node1 is 36 based instance name, node2 is 10 based instance name",
-			nodeName:      "aks-agentpool-20657377-vmss00000c",
-			nodeName2:     "aks-agentpool-20657377-vmss000012",
-			expectedValue: true,
-		},
-		{
-			name:          "node1 is 10 based instance name, node2 is 36 based instance name, but different vmss",
-			nodeName:      "aks-agentpool-20657377-vmss000019",
-			nodeName2:     "aks-agentpool-20657377-vmss00000c",
-			expectedValue: false,
-		},
-		{
-			name:          "node1 is 36 based instance name, node2 is 10 based instance name, but different vmss",
-			nodeName:      "aks-agentpool-20657377-vmss00000c",
-			nodeName2:     "aks-agentpool-20657377-vmss000019",
-			expectedValue: false,
-		},
-		{
-			name:          "node1 is 10 based instance name, node2 is 10 based instance name, but different vmss",
-			nodeName:      "aks-agentpool-20657377-vmss000019",
-			nodeName2:     "aks-agentpool-20657377-vmss000017",
-			expectedValue: false,
-		},
-		{
-			name:          "node1 is 36 based instance name, node2 is 36 based instance name, but different vmss",
-			nodeName:      "aks-agentpool-20657377-vmss00000c",
-			nodeName2:     "aks-agentpool-20657377-vmss00000a",
-			expectedValue: false,
-		},
-	}
-	for _, test := range tests {
-		result := isSameNode(test.nodeName, test.nodeName2)
-		if result != test.expectedValue {
-			t.Errorf("test(%s): result(%v) != expected result(%v)", test.name, result, test.expectedValue)
-		}
-	}
-}