Which kind of hard drive should I use for my server? [closed]
The S100 and S300 are software RAID cards, whereas the SAS6IR and H200 are hardware RAID cards. Based on that alone, I would recommend the latter.
Ubuntu also has Linux software RAID support. You can choose to use that during the installation. I've used Linux RAID on production machines and it works great. It also does not tie the drives to a proprietary RAID system, thereby allowing you to just pop them into another server if your server fails.