The name of the option was changed from max_scsi_luns in the 2.4 kernel to simply max_luns in the 2.6 kernel.
And the options line has to be in the /etc/modprobe.conf file.
So in short: Try adding this line to your /etc/modprobe.conf file:
options scsi_mod max_luns=8
This is an FC1 system with a 2.4 kernel (noted in the first post but lost in the previous one). Does the modprobe.conf vs modules.conf still apply?
Thanks!
Andrew Robinson