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SubjectRe: [PATCH] blacklist NCQ on Seagate Barracuda ST380817AS
Tejun Heo wrote:
> 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.

Yeah, that's the strange bit.

Surely someone at SuSE must have a drive like that,
which they could set up with XFS and reproduce the same results?

??
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