/dev/mapper inodes

• libdevmapper creates inodes in /dev/mapper corresponding to active mapped devices.

• LVM2 creates symbolic links to /dev/<vgname>/<lvname> for any Logical Volumes that are meant to be exposed to users of the system, but not for ones it uses internally e.g. for pvmove or snapshot exceptions. (Internal LVs are listed in square brackets in the output of 'lvs -a'.)