[CentOS] Recommendations for a “real RAID" 1 card on Centos box

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> Just for fun, the first hit on a google for "redundant atx power supply"
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> http://www.directron.com/tc400r8.html
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> Seems you can just plop one into your std atx chassis . . .
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i have never understood how something with a single feed can be termed 
'redundant'