I've found the workaround! Here is a link to what I found (although references a different blade model, it was the same issue.) ubuntuforums.org/showthread.php
Basically you have to tell it to be more patient while booting up so that the SAS module has time to start. Edit /etc/default/grub and change
The thread I linked to said to set it to 90, but in my case, it worked at 60. I tried 30, but that wasn't enough time.