Netbackup Appliance FT Server Poor Performance

Any one knows what is the best performance average to backup AIX Lpar trough SAN Client, i been applied buffers and number buffers for ft, but the performance is about a 200 MB/sec.

Netbackup Appliance and AIX lpar are connected by brocade switch with 8gb ports, the lpar has independent hba from the vios.

The appliance version is 2.6.0.3, i try to backup a Oracle Database with size 5.6 TB and take about a 8 hours to backup, the compatibility matrix between OS, Oracle Database is OK. Any Ideas ??