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73416ba
(Get the code!)
Strange, probably a different issue than mine. Mine seems to have gone away with a new PSU. Seems like my particular drives Barracuda 2TB LPs (ST32000542AS) go way above their power draw when flushing their cache. Normally not an issue, but in a RAID configuration, the simultaneous flush seems to cause one or more of the drives to lose power and cause issues. I had a 12V rail with 17A rating, but 2 drives (with max operating of 2A) seems to be more than enough to cause issues. Moved to a single 12V rail with 52A and problems went away.
Annoying as hell. WD20EARS drives seem to operate within their defined margin much better. In my case, I don't believe it's a Ubuntu related issue, i looked at the differences between stock and Ubuntu and nothing really pops out in the libata area (with regards to cache flushes at least).
Still, based on all my reading and such, I can't help but feel the SB700/800 + Seagate drives just don't play well for whatever reason.