This procedure is described in "The device_allocate File".
Create an empty lock file for each allocatable device in the /etc/security/dev directory.
This procedure is described in "Setting Up Lock Files".
If you add a Xylogics or an Archive tape drive, you can use the st_clean script; otherwise, create your own. How to create a device-handling script is described in "Device-Clean Scripts".
Make all device-special files for the device to be owned by user bin, group bin, and mode 000.
You can run the dminfo command to get a listing from the device_maps file of all the device-special files that are associated with the device you are making allocatable.