This is why I continually recommend external RAID cards. They are readily available and available for extended period. They also notify you of impending failure. You can even setup the RAID card to verify the arrays and battery weekly.
The 3Ware 9650SE has been sold since 2006 and is still one of the most popular SMB RAID cards. On the lower end HP, Dell, Lenovo servers, the onboard RAID is a joke. But even on the high end ones, it's all tied to the motherboard. They often do not sell them separately and they don't come cheap or fast.
I'll stick to my recommendation of hardware RAID over software/embedded RAID.
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