I tried those commands but got this msg:
# tape unload
Invalid command: unload
tape usage: tape [-<type>] <command> [device]
type: c (non-SCSI) or s (SCSI)
Cartridge tape commands:
reten - retension the tape
erase - erase and retension tape
reset - reset controller and drive
rewind - rewind tape controller
rfm - skip to next file
So I tried
# tape reset:
UX:tapecntl: ERROR: Device open failure.
UX:tapecntl: ERROR: Please check tape or cables are installed properly.
Operation may not be valid on this controller type.
# tape rfm gives:
UX:sh: ERROR: ^C^Ctape: Not found