Taking Backup on tape Getting Error

Hi,

My production server is running with SuSE Linux 10 SP2 with DB2 9.7 database.

I have LTO4 tape drive directly connected to my Production server

I am able to take backup to disk but when I am trying to take backup to tape I am getting error as below.

SRSPROD:shpadm 38> db2 backup database SHP to /dev/st0

SQL2031W Warning! Please mount the target or source media on device

"/dev/st0".

Do you want to continue(c), terminate this device only(d), abort the utility(t) ? (c/d/t)

I have full permissions on tape

SRSPROD:shpadm 39> ls -l /dev/st0

crwxrwxrwx 1 root disk 9, 0 2010-04-26 08:57 /dev/st0

Thanku