Re: [RFC][PATCH] libata: enable SATA disk fua detection on default

From: Christoph Hellwig
Date: Wed May 09 2012 - 04:25:27 EST

On Wed, May 09, 2012 at 02:19:56PM +0800, Zheng Liu wrote:
> disable FUA detection for SATA disk. If FUA feature can be used, we
> could disable io_barrier to improve the performance. Now one solution

You can't run with -o nobarrier just because the driver/hardware support
FUA. However the implementation of -o barrier (aka REQ_FUA) is a lot
more efficient if it is implemented. If your workload has a high
percentage of REQ_FUA requests it might be better to switch the disks to
write through mode entirely.

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