Our DAT streamer ARCHIVE Python 28454-XXX is connected to second SCSI controller ncr815. Only two little modifications were useful for convenience: (1) I created /dev/tape as the link to /dev/nst0, and (2) linked /bin/mt to /bin/mt-st in order to have the possibility to set variable block size. The device is available for disk group.
Usage and recommendations:
mt setblk 0(to set variable physical block size)
dd if=/dev/tape bs=96b | tar xf -(to read our tapes written at Sun)
mt fsf, etc. (for tape positioning)
tar cfb - 96dirs
| dd of=/dev/tape bs=96b(write to tape)