TSM 5.2 performances on AIX 5.1

[Madalina Cozea]

Hello everybody, 
I need some info regarding the performances of a TSM on AIX urgent ,if any of u could 
help , because i'm experiencing some problems. 
I've installed TSM 5.2 on a AIX box (5.1 64 bits) and left all the default parameters 
. 
The performances over a Gbit network are poor , backups of 4 GB taking over 35min 
(5.1.5 AIX client) . There is no load on server , the disk is busy 5% . 
Do u have any  idea what could causing poor performance and what can be done ?
thanks, 
Mada