[root@temp4 ~]# lvremove /dev/mapper/luks01vg-luks01lv
Logical volume luks01vg/luks01lv is used by another device.
[root@temp4 ~]# umount /luks
[root@temp4 ~]# cryptsetup luksClose /dev/mapper/luks1
[root@temp4 ~]# lvremove /dev/mapper/luks01vg-luks01lv
Do you really want to remove active logical volume luks01lv? [y/n]: