Database Software

Hello, I'm having problems setting up TDP for Oracle. When I run a backup, I get the following error stack from RMAN:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of allocate command on t1 channel at 02/21/2007 09:40:52
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27000: skgfqsbi: failed to initialize storage subsystem (SBT) layer
IBM AIX RISC System/6000 Error: 106: Reserved errno was encountered
Additional information: 7011
ORA-19511: Error received from media manager layer, error text:
SBT error = 7011, errno = 106, sbtopen: system error

I'm running AIX 5.2, TDP 5.3, level 3
Oracle version 9.2.0.4
My libobk.a file is linked in the following manner
libobk.a@ -> /usr/lib/libobk64.a
/usr/lib/libobk64.a@ -> /usr/tivoli/tsm/client/oracle/bin64/libobk64.a

I'm not sure if the version of AIX i'm running is 64 bit or not, does anyone know how I can check this?

Oh and the sbtio.log file is empty.