Is the module loaded? type command lsmod to list modules. Look for advansys.
If not there load it with command ' modprobe advansys ' as load ' modprobe sd_mod '
If you get a FATAL: Module advansys not found then you need to compile it for the kernel.
You will need a copy of your current running kernel source to compile it. In the 2.6 kernels the advansys is no longer in the .config that is created when you run make xconfig. You will need to edit the .config and add this line under the SCSI low-level drivers section.
and also make sure you have this under the Scsi support section
It would be best to downlaod the latest kernel from http://www.kernel.org
and compile from that one. Again you will need to manual edit your .config file since the xconfig tool does not have the advansys in the list. Not for sure of the reason.
Extract kernel to /usr/src
ln -s linux-2.6.15.* linux
make oldconfig may need to run ' make menuconfig '
make xconfig ( modify if needed ) other choices ' make config ' and ' make gconfig '. Make sure you save it then exit.
edit the saved .config file to add advansys option