SuperMicro AOC-USAS2-L8i 8-port SATA controller supported by the mps(4) driver in FreeBSD 8.2-STABLE onward. Uses multi-lane cables with either SFF-8087 connectors (for plugging directly into hot-swap backplanes) or SFF-8087 breakout cables (4x SATA connector on one end) for plugging directly into drives. Works beautifully with ZFS. And you get dedicated bandwidth to each drive (whereas an SAS expander/SATA PM splits bandwidth between multiple drives on a single channel).
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