To mount an LVM volume on Linux, first set the volume to the “active” state:
Mount the drive as usual. When finished, the drive must be unmounted and the command
must be executed. Note that this could turn off all of your volume groups, so you should be careful and use a different command if you have more than one volume group.
Alternatively you can activate a specific volume group with the command
vgchange -a y <VolGroupName>