On Mon, Apr 02, 2018 at 10:07:01PM +, Hugo Mills wrote:
> On Mon, Apr 02, 2018 at 06:03:00PM -0400, Fedja Beader wrote:
> > Is there some testing utility for this? Is there a way to extract this/tell
> > with a high enough certainty from datasheets/other material before purchase?
>
>Given that not implementing barriers is basically a bug in the
> hardware [for SATA or SAS], I don't think anyone's going to specify
> anything other than "fully suppors barriers" in their datasheets.
>
>I don't know of a testing tool. It may not be obvious that barriers
> aren't being honoured without doing things like power-failure testing.
And you'd need to do a lot of power-cycling during writes, with various
write patterns -- as unless you have a case of "let's lie about barriers to
make benchmarks better than the competition" where barriers are consistently
absent, it might be a genuine bug in a well-meaning controller that at least
tries but sometimes fails to. The intentional case is usually easy to
detect -- but just wait go get volkswagenized. :/
Meow!
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