How can I connect 12 SATA 3 disks to a motherboard that has just two SATA 3 connectors. What solution would you recommend?
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It depends on how serious you are about physical data loss protection. I use a LSI MegaRAID SAS9280-16i4e (16+4 connectors) at home with a RAID 6 configuration. Those controllers have great protection features, speed and perfect OS support, but cost a lot of money. But my last data loss cost me more than 5 times as much...
As an extra, I suggest buying the Battery Backup Unit. For extra speed and security.