Trying to unmount Logical Volume, gives error "umount: /dev/lvm3/nlv1: not mounted"

Question

I'm fairly new to Logical Volume Management, so please bare with me. I want to unmount the logical-volume lvm3-nlv1, in order to finally delete it.

Viewing mount point using lsblk

When I run lsblk, the following is the output I get:

NAME          MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda             8:0    0 223.6G  0 disk 
├─sda1          8:1    0   549M  0 part 
├─sda2          8:2    0  49.2G  0 part 
│ └─lvm3-nlv1 253:0    0   2.3G  0 lvm  /media/theperson/97ee469c-3af3-4a2d-a6be-b86847d686ef
├─sda3          8:3    0     1K  0 part 
└─sda5          8:5    0 173.8G  0 part /

Finding mount information in /proc/mounts using grep

When I tried fininding nlv1 using grep like te following, we can see that nv-nlv1 is mounted:

grep nlv1 /proc/mounts

Output:

/dev/mapper/nv-nlv1 /media/theperson/97ee469c-3af3-4a2d-a6be-b86847d686ef ext3 rw,nosuid,nodev,relatime 0 0

Trying to Unmount Logical Volume using umount

I tried the following command to unmount:

sudo umount /dev/lvm3/nlv1       #tried even with "-v"

Output:

umount: /dev/lvm3/nlv1: not mounted.

Am I missing something? I tried finding an answer on StackOverflow, but none applies to me.

Answer 1

You need to use the correct device name in the umount-command, it is the name you found with the previous grep-command:

sudo umount /dev/mapper/nv-nlv1

Alternatively you can pass the mount-point to the umount-command:

sudo umount /media/theperson/97ee469c-3af3-4a2d-a6be-b86847d686ef