diff --git a/pkg/common/cns-lib/volume/manager.go b/pkg/common/cns-lib/volume/manager.go
index 856f284891..640082aa8d 100644
--- a/pkg/common/cns-lib/volume/manager.go
+++ b/pkg/common/cns-lib/volume/manager.go
@@ -1064,6 +1064,7 @@ func (m *defaultManager) AttachVolume(ctx context.Context,
 		// Construct the CNS AttachSpec list.
 		var cnsAttachSpecList []cnstypes.CnsVolumeAttachDetachSpec
 		cnsAttachSpec := cnstypes.CnsVolumeAttachDetachSpec{
+			DiskMode: string(vim25types.VirtualDiskModeIndependent_persistent),
 			VolumeId: cnstypes.CnsVolumeId{
 				Id: volumeID,
 			},