TSM备份oracle Rman脚本报错呀。请各位帮帮忙

$ rman target /
Recovery Manager: Release 10.2.0.1.0 - Production on Thu May 10 11:08:25 2012
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
connected to target database: JYTEST (DBID=3817242930)
RMAN> run
2> {
3> allocate channel c1 device type 'sbt_tape' parms 'ENV=(TDPO_OPFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
4> backup full tag 'dbfull' format 'dbfull_%T_%d_%s_%p' database include current controlfile;
5> release channel c1;
6> }
using target database control file instead of recovery catalog
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of allocate command on c1 channel at 05/10/2012 11:11:29
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