RMAN> show all;
RMAN configuration parameters for database with db_unique_name OTAPDEV are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 1 DAYS;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO 'SBT_TAPE';
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/u10/otapdev/sp
file_control_files/%F';
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE SBT_TAPE TO '%F'; # defa
ult
CONFIGURE DEVICE TYPE DISK PARALLELISM 4 BACKUP TYPE TO BACKUPSET;
CONFIGURE DEVICE TYPE 'SBT_TAPE' PARALLELISM 4 BACKUP TYPE TO BACKUPSET;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE SBT_TAPE TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE SBT_TAPE TO 1; # default
CONFIGURE CHANNEL 1 DEVICE TYPE 'SBT_TAPE' PARMS  'ENV=(MAXOPENFILES=1,BLKSIZE=2
097152,TDPO_OPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
CONFIGURE CHANNEL 2 DEVICE TYPE 'SBT_TAPE' PARMS  'ENV=(MAXOPENFILES=1,BLKSIZE=2
097152,TDPO_OPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
CONFIGURE CHANNEL 3 DEVICE TYPE 'SBT_TAPE' PARMS  'ENV=(MAXOPENFILES=1,BLKSIZE=2
097152,TDPO_OPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
CONFIGURE CHANNEL 4 DEVICE TYPE 'SBT_TAPE' PARMS  'ENV=(MAXOPENFILES=1,BLKSIZE=2
097152,TDPO_OPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
CONFIGURE MAXSETSIZE TO UNLIMITED;
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BZIP2'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u10/otapdev/spfile_control_files/snapcf
_otapdev.f';

RMAN>
sql statement: alter system archive log current

RMAN> 2>
Starting backup at 11-11-2011 15:12:12
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 11/11/2011 15:12:13
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management Library
Additional information: 2

19554, 00000, "error allocating device, device type: %s, device name: %s"
// *Cause:  The specified device could not be allocated.
// *Action: One or more other messages should be displayed to help pinpoint
//          the cause of the error.  Correct the error and retry the
//          allocation.
bcm@bcm-laptop:~$ oerr ora 27211
27211, 00000, "Failed to load Media Management Library"
// *Cause:  User-supplied SBT_LIBRARY or libobk.so could not be loaded. Call
//          to dlopen for media library returned error. See Additional
//          information for error code.
// *Action: Retry the command with proper media library. Or re-install
//          Media management module for Oracle.

My LD_LIBRARY_PATH was set like this:

echo $LD_LIBRARY_PATH
/u01/app/oracle/product/11g/lib:/u01/app/oracle/product/11g/rdbms/lib

Therefore it could not find the libobk.a library.. So I created
a link in $ORACLE_HOME/lib to point to the actual library.

$ pwd
/u01/app/oracle/product/11g/lib


$ ls -tlr libobk.a
lrwxrwxrwx    1 root     system           17 Nov 14 13:02 libobk.a -> /usr/lib/libobk.a