Check the man pages for tar. Lots of help via searching the web.
/dev/st0 (rewind tape on process completion)
/dev/nst0 (no rewind tape on process completion)
tar -cvf /dev/st0 /home/oracle/file.txt
My system admin is in the process of purchasing a LTO tape drive. Just wondering if you had any problems and what do you think of the drive.