On 22/11/18 at 22:31, Martin Steigerwald wrote:
> barrier related mount options are deprecated, well even removed at least
> for XFS, deprecated in 4.10 and and removed in 4.19¹. Write barriers
> have been replaced by explicit cache flushes² (somewhere around 2.6.39…
> I am too lazy to look it up in my Linux Performance tuning and analysis
> training slides right now).


  To bad I can't take advantage of them because of this:

[    1.031094] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA

> But with kernels still supporting the mount
> option, nobarrier or barrier=0 would have been simply dangerous for data
> integrity unless you have made sure that no sudden write interruption by
> for example power loss can happen.


  I use them on battery-backed systems.


  Bye,




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