You could get a bunch of 840 Evo drives, say, 7 of them, for around $3500, for a 6TB raid5 that would probably get at least a gigabyte a second even with parity calculations overhead.
Though ZFS and Btrfs solve the unreadable bit problem with extent checksums, so you really don't need to worry about mechanical disks, yet. You would need two URE's in the same block to kill the checksumming.
Though ZFS and Btrfs solve the unreadable bit problem with extent checksums, so you really don't need to worry about mechanical disks, yet. You would need two URE's in the same block to kill the checksumming.