If you add more allocatable devices to the system, you might need to create your own device-clean scripts. The deallocate command passes a parameter to the device-clean scripts. The parameter, shown here, is a string that contains the device name (see the device_allocate(4) man page):
st_clean -[I|F|S] device-name
-F is for forced cleanup. This option is interactive and assumes that the user is available to respond to prompts. A script with this option must attempt to complete the cleanup if one part of the cleanup fails.