Backup Exec ignoring Oracle RMAN Compression?
Backup Exec 2012 running on W2K8R2
Oracle databases running on Linux.
Using Backup Agent to run backup jobs of Oracle database - to disk on Backup Exec W2K8 server.
We're trying to reduce the size of Backup Exec (BE) backup files. The backups, having been written to disk, or then copied across a 10Mb WAN link using robocopy.
The bulk of our BE backup are Oracle databases, and so I'm concentrating on these database backups. I'm familar with Oracle and RMAN, I can run local RMAN backups on the Linux servers with or without RMAN compression, by settting CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET; Running with RMAN compression reduces the size of the rman backup files by about 70%.
Now, back in BE:
Even though I've set the Oracle databases to use RMAN compression for all database backups, BE seems to ignore this setting.
Backing up the same Oracle database in BE - with or without RMAN compression set at the RMAN device level, makes no difference to the resultant BE backup files. Looking at the BE Job Log shows the same volume of data having been backed up, and no indication of rman compression having been used.
So, it would seem Backup Exec ignores the RMAN devices settings, and uses it's own compression. In this case, 'Software compression' has been used by Backup Exec.