ubuntu@ubuntu:/mnt$ sudo mount -t ext4 /dev/mapper/isw_fegbaeadg_RAID0_SSD1 ~/myubuntu/
mount: /dev/mapper/isw_fegbaeadg_RAID0_SSD1 already mounted or /home/ubuntu/myubuntu/ busy
ubuntu@ubuntu:/mnt$ sudo umount -l /dev/mapper/isw_fegbaeadg_RAID0_SSD1
umount: /dev/mapper/isw_fegbaeadg_RAID0_SSD1: not mounted