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instead. The intent for io_min was to convey the physical_block_size in the case of an individual drive. And for it to be set to the stripe chunk size in stacking scenarios that would otherwise involve read-modify-write (i.e. RAID5 and RAID6). io_opt was meant to communicate the stripe width. Reporting very large values for io_opt is generally counterproductive since we can't write multiple gigabytes in a single operation anyway. logical <= physical <= io_min <= io_opt <= max_sectors <= max_hw_sectors -- Martin K. Petersen