http://privex3guvvasyer6pxz2fqcgy56auvw5egkir6ykwpptferdcb5toad.onion/articles/linux-lvm-cheatsheet
Don't worry, it can be fixed. It's caused by the snapshot having the same label and/or UUID as the original volume, causing XFS to believe it's already mounted. Option 1. Mount the filesystem with UUIDs disabled If you only need to mount the snapshot temporarily, then you can simply disable the use of UUIDs while mounting.