Solution ORA-19554

RMAN-00571: ===============================================

RMAN-00569: ======== ERROR MESSAGE STACK FOLLOWS =========
RMAN-00571: ===============================================
RMAN-03009: failure of allocate command on t1 channel at 08/08/2012 08:51:48
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management Library
Additional information: 2

This problem occurs during TSM configuration on AIX for RMAN backup.

root cause : Absence of libobk64.a package on $ORACLE_HOME/lib/ 

Solution : Think simple :-) 

This package is Available on tsm library directory , so just create soft link 

bash-3.2$ cd  ORACLE_HOME/lib/ 

bash-3.2$ ln -s /usr/lib/libobk64.a libobk.a

Then simply query that the package are available on ORACLE_HOME/lib/ 

bash-3.2$ ls -lrt libobk*

Love Oracle :-)