RMAN: backup fails ANU2503E "Backup object already exists on TSM (Doc ID 443900.1)

Problem:

Sending backups to SBT fails with the follwoing error :


RMAN-03009: failure of backup command on ORA_SBT_TAPE_1 channel at 02/19/2015 10:35:07
ORA-19506: failed to create sequential file, name="igpu49hm_1_2", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Error received from media manager layer, error text:
ANU2503E Backup object '/adsmorc//igpu49hm_1_2' already exists on TSM Server.
ORA-19600: input file is backup piece (+DGFRA/my_db/backupset/2015_01_31/annnf0_arch_id0_20150131_1807_0.3915.870458935)
ORA-19601: output file is backup piece (igpu49hm_1_2)

 Investigation:

 Based on the metalink note Doc ID 443900.1 :
 The basic problem is that when perform a backup using a disk channel, which does not use TDPO at all.Then allocate a channel with "sbt_tape" and perform a backup of the 'backup recovery area'. The problem is that the name of the backup piece when going to tape will take the same name as the backup piece already on disk.

In this case, this attempted to backup the same backup piece using TDPO twice. This caused the second backup attempt to fail, since this already had an image with the same name.

Since, TDPO does not choose the image name, but rather it's determined and passed by rman. TDPO will not allow duplicate backup images to be created to prevent overwriting an existing backup.

VERITAS is unwavering on allowing a backup_id within the catalog to be overwritten or reused. It will NOT happen. 

Solution:

Use the %t backup format option , so that the TDPO backup_id that is generated is unique for each copy.
so :

 run {
 allocate channel oem_disk_backup device type disk;
 recover copy of database with tag 'ORA$OEM_LEVEL_0';
 backup incremental level 1 cumulative copies=1 for recover of copy with tag 'ORA$OEM_LEVEL_0' database;
 release channel oem_disk_backup;
 allocate channel oem_sbt_backup1 type 'SBT_TAPE' format '"MY_FORMAT"_%d_d%s_p%p_%U_%t.bkp' maxpiecesize 100G parms='ENV=(TDPO_OPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
 backup archivelog all not backed up;
 backup recovery area;
 backup backupset all not backed up since time 'SYSDATE-1';
 }
RUN


Or just to send some backupieces :

{

CONFIGURE CONTROLFILE AUTOBACKUP OFF;

BACKUP DEVICE type SBT backupset 19941,19942,19943,19944,19945,19946,19947,19948,19949,19950,19951,19952,19953,19954,19955,19956,19957,19958,19959,19960,19961,19962,
 19963,19964,19965,19966,19967,19968,19969,19970,19971,19972,19973,19974,19975,19976,19977,19978,19979,19980,19981,19982,19983,19984,19985,19986,19987,19988,19989
format="MY_FORMAT_%U" ;

}