AIX

your performance depends on the underlying hardware (what type of disks you have in your DS* boxes), the used disk setup within (raid1 vs raid5) and the infrastructure on your way to your disks. If the physical disks are same type (like 15k) and same size and your switches your way to that storage are same bandwidth, than your perforance will be most likely very similar - if the disks are slower, or the switches are lower bandwidth than it might or might not be slower as most environments do never max out their SAN boxes / switches.
Overall AIX should be capable to make the best out of it no matter what is provided from SAN site.
Regards
zxmaus

Thanks. Did you think any driver conflicts will arise while adding lower end and higher end model lun in the aix box?

Hi,

I do not think so as you do not change your hba's - and the luns themselves do not need a driver.

Regards
zxmaus