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They managed to back it up at 1.6TB per hour.
Remember also that this is TDP not the BA client so it will behave a little different.
My experience with the TDP is with DB2 so the config may be different for Oracle.
What is backom?
On your side, which bandwidth do you get, per tape drive, when you backup and restore?
What may cause your performance problem while using a disk cache (staging area) is the data is migrated from disk to tape in the "wrong" order. Rman (Oracle/SAP) is requesting files in the same order as they were written to the backup system. The use of a staging disk in this case may affect the restore.
/hogmaster