Maurilio Longo wrote:

I did try to use smartmontools, but it cannot report SMART logs nor start
SMART tests, so I don't know how to look at their internal state.

Really? That's odd...

You could also have a firmware bug on your disks. You might try lowering
the number of tagged commands per disk and see if that helps at all.

from man marvell88sx I read that this driver has no tunable parameters, so I
don't know how I could change NCQ depth.

ZFS has a per block device outstanding IO tunable - I think it's in the evil tuning guide.

--
Carson

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