Solved!!!
it is probably a bug of the SLES installer and Co.
It seems that the installer tries to load the module for the 2.6 kernel instead of the one for kenel 3
During setup phase the system tryed to install module hpsa with error "invalid module format"
modinfo hpsa show:
vermagic: 2.6.31.12-0.7-default SMP mod_unload modversions
while the module copied from a running SLES (installed on a vm using only the setup disk 1) gave this
vermagic: 0:11-3.0.76-default SMP mod_unload modversions
I did start the installation from SLES dvd and copied the correct module via USB stick,
depmod -a
modporbe hpsa
at this point is able to access the storage and to complete the installation.