On Wed, 07 Feb 2007 22:56:45 -0600
Robert Hancock <[email protected]> wrote:
> Paolo Ornati wrote:
> > If mounting XFS with "nobarrier" fixes the problem it seems that more
> > than one Seagate disk cannot handle the Cache Flush command while other
> > commands are in fly...
>
> It's not allowed to overlap NCQ (FPDMA read/write) commands with any
> other commands such as cache flushes. libata core guarantees that this
> doesn't happen by deferring such requests until the FPDMA commands are
> complete. (At least, it's supposed to..)
I didn't know that. Anyway just mounting XFS with "nobarrier" fixes
the ploblem for me... so libata is buggy or I don't know!
--
Paolo Ornati
Linux 2.6.20 on x86_64
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