On 12/14/15 4:34 AM, Georg Schönberger wrote:

On 2015-12-14 11:27, Christoph Hellwig wrote:

quoted

On Mon, Dec 14, 2015 at 10:18:54AM +0000, Georg Sch?nberger wrote:

quoted

quoted

Or to phrase it
differently:  If nobarrier makes a difference skipping it is not safe.

I do not fully understand that sentence, what do you mean by "makes a
difference" and "skipping is not safe"?

The rule of thumb is: if nobarrier makes your workload run faster you
should not be using it, aka: don't use it.

OK, thanks for clarification.
Should the XFS FAQ be updated?
*http://xfs.org/index.php/XFS_FAQ#Q._Should_barriers_be_enabled_with_storage_which_has_a_persistent_write_cache.3F

Yes, it should.  I've made some edits, hopefully it's up to date and clear now.

Thanks,
-Eric

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