Questions regarding building a 16+ drive system [closed]

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http://serverfault.com – I have several questions about building a large storage system: How do you plug 16+ SATA drives into a motherboard? Are there hardware RAID cards that support 16+ SATA ports? Can you grow a RAID 6 array from 6 drives to 16, one drive at a time? How do you know when a drive out of the 16+ set is failing or has failed? How do you know which one? What does the repair process typically look like? Is all data lost if the hardware RAID controller fails? What wattage power supply is needed to handle 16+ drives? Bonus: On average, how frequently do drives fail? With hardware RAID, are all drives (HowTos)