Date: Tue, 15 Oct 2013 13:02:38 -0400 From: Allan Jude <freebsd@allanjude.com> To: Adam McDougall <mcdouga9@egr.msu.edu>, "Teske, Devin" <Devin.Teske@fisglobal.com> Cc: "svn-src-all@freebsd.org" <svn-src-all@freebsd.org> Subject: Re: svn commit: r256343 - in head/usr.sbin/bsdinstall: . scripts Message-ID: <525D752E.6020901@allanjude.com> In-Reply-To: <20131015165820.GO2097@egr.msu.edu> References: <201310112041.r9BKfZeT002056@svn.freebsd.org> <20131015145032.GD98118@admin.xzibition.com> <13CA24D6AB415D428143D44749F57D720FC6A04C@LTCFISWMSGMB21.FNFIS.com> <525D5E07.1070900@allanjude.com> <13CA24D6AB415D428143D44749F57D720FC6A61F@LTCFISWMSGMB21.FNFIS.com> <20131015165820.GO2097@egr.msu.edu>
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On 2013-10-15 12:58, Adam McDougall wrote:
> 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.
>
>
Yes, the gnop 4k section option is a toggle, which defaults to on.
--
Allan Jude
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