Re: [PATCH] blacklist NCQ on Seagate Barracuda ST380817AS

Mark Lord wrote:
Jeff Garzik wrote:
Paolo Ornati wrote:
I have this problem only with XFS, and even with XFS it goes away
mounting with "nobarrier"...

This last is an interesting datapoint.

I wonder if libata has a generic problem with NCQ + FLUSH CACHE.

Yeah, that's pretty suspicious. Prior to issuing a FLUSH_CACHE op,
one must first drain all outstanding NCQ commands (and not issue new ones).

I'm sure the code must *try* to do that, but perhaps there's a bug in
there?
Or just another drive bug?

If there was such a bug, the aborted commands list should contain both
FPDMA commands and FLUSH commands. I don't think command filtering
itself is broken. Possibly another quirky firmware but it's strange
that this is the only Seagate drive showing this problem.

Thanks.

--
tejun
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