Rebuilding the initial ram disk (initrd)
Installing new hardware may mean that new kernel need to be loaded when your server boots up. There’s a two step process to making a new initrd file:
First, add the appropriate line to your /etc/modules.conf or /etc/modprobe.conf which corresponds to your new kernel module.
Next, rebuild the initial ram disk after making a backup of the current one:
# cp /boot/initrd-`uname -r`.img /boot/initrd-`uname -r`.img.bak
# mkinitrd -f initrd-`uname -r`.img `uname -r`
Reboot the server now and make sure the new driver is loaded properly.