Does a Supermicro x8SAX support SAS drives? I looked through the manual but am not seeing where this is mentioned. I want to set up on board raid 1
Did you not come across this page during your searches (the first result when you Google for the motherboard type)?
No mention of SAS support - there doesn't appear to be a SAS controller onboard.
Just because there's no SAS support doesn't mean you can't have RAID - the ICH10R controller supports RAID. Just use SATA drives.