Changed the WWN settings and also tried booting in safe mode to check if it was a plug-in issue and neither of which had any effect.
I don't think it's a compatibility issue as it shows the drives in the OS boot, but I maybe wrong. Perhaps there's a setting in the hba bios settings I need to change? At the moment I have the boot support set to "disabled" but I've tried on all options and none of them seem to work.
I also forgot to mention I'm running version 6.3.5