On Tue, Oct 15, 2013 at 04:28:21PM +0000, Teske, Devin wrote:
>>>> +: ${ZFSBOOT_GNOP_4K_FORCE_ALIGN:=1}
>>>>
>>> >
>>> >
>>> I believe this trick is no longer needed after r254591.
>>>
>
> This may be the case, I am not sure if r254591 'always' fixes the problem,
maybe someone else can weight in with a more definite yes/no
>
I'll hold off on doing anything with 4K sectors gnop hack until
we get confirmation.
r254591 says:
"Use GEOM's stripesize attribute, if set, as the physical sector size of the
GEOM."
I'm pretty sure GEOM only knows for a subset of devices, for example if the
kernel contains a quirk based on the drive model. If you are aiming for
performance, my 2 cents is to keep it. On the other hand, forcing 4k and thus
ashift=12 wastes more space in a zpool on a 512b device so it would be nice to
make this a toggle in the GUI defaulting to on. If it is already, I apologize,
I
haven't tried the code in a few iterations.
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