if err = util.persistISCSI(b); err != nil {
		// Return uncertain error so kubelet calls Unmount / Unmap when the pod
		// is deleted.
		return "", types.NewUncertainProgressError(err.Error())
	}
	return devicePath, nil
}

// persistISCSI saves iSCSI volume configuration for DetachDisk into global
// mount / map directory.
func (util *ISCSIUtil) persistISCSI(b iscsiDiskMounter) error {