You can learn more about PFS mirroring [here](http://www.dragonflybsd.org/docs/how_to_implement_hammer_pseudo_file_system__40___pfs___41___slave_mirroring_from_pfs_master/)
-In order to correctly map hard disk sernos to device names ypu can use the 'devattr' command.
+In order to correctly map hard disk sernos to device names you can use the 'devattr' command.
# udevd
# devattr -d "ad*" -p serno