I have run the command:
lvremove /dev/pve/vzsnap-proxmox-0
And removed the snapshot. The virtueal machines are still working fine.
Then i run the command you mentioned to me, and the output is the following:
proxmox:~# ls -l /dev/mapper
total 0
crw-rw---- 1 root root 10, 59 Nov 16 12:53...