Вот на днях в рассылке по ФриБСД пришло:
праблемы у него саспектают:

Hello,

I'm testing high-density SATA storage with FreeBSD 9.1-STABLE. The
hardware is:

Drives: 45 Seagate Altos ST3000NC002
Port Multipliers: 9 SiI3826
SATA Controller: 3 * Marvell 88SX7042


After a few hours of a database-like workload over ZFS (NCQ enable, disk
write caches disabled), a disk becomes unresponsive (we think due to a
drive firmware problem):

............