Hi Martim,
if direct management is not supported or available you can always put your storage in an VIO SSP (Shared Storage Pool) and use it this way. I have two customers who use their Hitachi storage this way.
Stefan Gocke
IBM Certified Adanced Technical Expert (CATE)-Power Systems for AIX v3
IBM Certified Advanced Deployment Professional Spectrum Storage Mgmt.V6
and more ...