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RAID's are good for performance and reliability. SSD's and Exchange are great examples of why we won't need RAID's. SSD's have great performance without striping. Exchange does reliability at the application layer and has been optimized for slow disk. Why would we need a RAID?

RAID assumes disks don’t have errors on them. As hard drive capacities reach around 10TB, that will no longer be a realistic assumption, and RAID will no longer work.

The answer lies in next-generation error-tolerant and redundant filesystems, like ZFS, BTRFS and HAMMER.

assuming that the motherboard fully utilizes transfer rates between drives using the new interface.