Date: Tue, 26 Nov 2013 01:50:15 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Warren Block" <wblock@wonkity.com>, "Eric Browning" <ericbrowning@skaggscatholiccenter.org> Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: Performance difference between UFS and ZFS with NFS Message-ID: <FBF56D9ED0A84CDDB60F9FFF0B28853E@multiplay.co.uk> References: <2103733116.16923158.1384866769683.JavaMail.root@uoguelph.ca> <9F76D61C-EFEB-44B3-9717-D0795789832D@gmail.com> <CAM=5oeAF2gfccrGNdbApUDpqRae4OQjZ7oaZZi4y1j%2BsF6PsTw@mail.gmail.com> <5969250F-0987-4304-BB95-52C7BAE8D84D@gmail.com> <CAM=5oeBmCAq9unFGC2CBoJ3rZMm9MtDw1DWkFpo2ZqQtx3G%2B=Q@mail.gmail.com> <18391B9C-2FC4-427B-A4B6-1739B3C17498@gmail.com> <CAM=5oeAXiRn2aHvNPuZRPFJp6G45OqdQEDsz2_xGobCUHJp_VQ@mail.gmail.com> <CAM=5oeAybYZsn-TQTvfYO3Kx-chZULeYUEhg9fRMi-CFX0aYBA@mail.gmail.com> <B7C29F362A5045B48BF4CE223E7CE0AD@multiplay.co.uk> <CALfReyfDWTsgXf8JX-eNYOTFdkcYovUf0q=zGQPDUsEUi4nqbw@mail.gmail.com> <CAM=5oeAPG0Vfa-fT1t=Vc8FS_jJGBiR=yq0wuUmEZYLYB%2Br7RA@mail.gmail.com> <DD94A3B19E23453189D4A0C5AB58618A@multiplay.co.uk> <F1C5007B61404180A44CA5719C859EDE@multiplay.co.uk> <CAM=5oeDR3rSmxpffJnTFSkXMxRY0a0gz-NnogoQLhc4ih06gPw@mail.gmail.com> <alpine.BSF.2.00.1311251840370.49513@wonkity.com>
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----- Original Message -----
From: "Warren Block" <wblock@wonkity.com>
> On Mon, 25 Nov 2013, Eric Browning wrote:
>
>> I've tried to 4K align these SSDs with gnop but they are currently ashift
>> 9.
>
> Those are two different things. Alignment is controlled by partition
> starting block and size. Both should be integer multiples of 4K.
>
> Using gnop to force ashift=12 just makes sure ZFS is using 4K blocks, it
> does not force alignment.
stable/10 and current/11 have dynamic ashift support.
It still requires either the disk report 4k sectors or a cam
quirk. So if you believe your disk is 4k but its not reporting
as such let us know.
Regards
Steve
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