Netbackup 7.5 very slow writting on tape with RMAN
I have a problem with my RMAN backup on Netbackup 7.5.
I'm using RMAN script for backup, it was working ok until we made a DB upgrade, from Oracle 9 to 10. After the upgrade, the RMAN backup job runs at 2500kb/s, when the standard backup on the same server runs at more than 90mb/s.
The same server works as Oracle DB server and Netbackup master, media and client, and the library is conected directly via FC. The OS is RHEL 5.7.
Any ideas why the write speed is so low with RMAN?