device, _, err := extractDeviceAndPrefix(mntPath)
	if err != nil {
		return err
	}

	var bkpPortal []string
	var volName, iqn, iface, initiatorName string
	found := true

	// load iscsi disk config from json file
	if err := util.loadISCSI(c.iscsiDisk, mntPath); err == nil {
		bkpPortal, iqn, iface, volName = c.iscsiDisk.Portals, c.iscsiDisk.Iqn, c.iscsiDisk.Iface, c.iscsiDisk.VolName

	if err != nil {
		return nil, err
	}

	lun := strconv.Itoa(int(lunStr))
	portal := portalMounter(tp)
	var bkportal []string
	bkportal = append(bkportal, portal)
	for _, p := range portals {
		bkportal = append(bkportal, portalMounter(string(p)))
	}

	iface, initiatorNamePtr, err := getISCSIInitiatorInfo(spec)
	if err != nil {
		return nil, err
	}