AIX LPAR Media Server Performance

Hi Guys,

 I am looking for performance statistics for AIX lpar as a media server, we have windows physical server which has good throughput for backups but AIX lpar media server is too slow. I check netstat -v en0 and found Adapter rate is 20000 which indicates 20gb pipe right, However I am aware it is inherited from the parent the actual hardware and it is being used by many lpars. So is there any guidelines to tune or to check AIX lpar as Netbackup media server performance?

Thanks

Sid