Date: Wed, 17 Mar 2010 15:17:58 -0300 From: Thiago Damas <tdamas@gmail.com> To: Olivier Smedts <olivier@gid0.org> Cc: =?ISO-8859-1?Q?Dag=2DErling_Sm=F8rgrav?= <des@des.no>, Mohacsi Janos <mohacsi@niif.hu>, freebsd-hackers@freebsd.org Subject: Re: ATA 4K sector issues Message-ID: <f8e3d83f1003171117k20d553b7y7ce4c3c8ed2f5c96@mail.gmail.com> In-Reply-To: <367b2c981003171112n785ea9d4q21d00b533819ca67@mail.gmail.com> References: <alpine.BSF.2.00.1003171114280.74067@mignon.ki.iif.hu> <86tysf58a2.fsf@ds4.des.no> <alpine.BSF.2.00.1003171652260.74067@mignon.ki.iif.hu> <f8e3d83f1003171034m5e75eae4r5e8b31d88d361d3b@mail.gmail.com> <367b2c981003171112n785ea9d4q21d00b533819ca67@mail.gmail.com>
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I tried with gpart, gpt scheme, begining in all block alignments possible, 34, 35, 36, 37, 38, 39 etc Even 64 gpart create -s gpt ad4 gpart add -s 64 -t freebsd-zfs ad4 With UFS, I previouly did some tests (in portuguese): Particao sem alinhar inicio => 34 1953525101 ad4 GPT (932G) 34 1953525101 1 freebsd-ufs (932G) newfs -U (padrao -f 2048 -b 16384) # time tar xfj /install/releases/i386/8.0-RELEASE/8.0-RELEASE/ports/ports.tgz 2.342u 5.013s 20:35.65 0.5% 64+1091k 6623+2734io 0pf+0w newfs -U -f 4096 -b 32768 # time tar xfj /install/releases/i386/8.0-RELEASE/8.0-RELEASE/ports/ports.tgz 2.590u 5.263s 22:06.32 0.5% 63+1087k 10911+1676io 0pf+0w Particao alinhada em multiplos de 4096 bytes (blocos logicos de 512 bytes, entao, multiplo de 8 blocos) => 34 1953525101 ad4 GPT (932G) 34 30 - free - (15K) 64 1953525071 1 freebsd-ufs (932G) newfs -U (padrao -f 2048 -b 16384) # time tar xfj /install/releases/i386/8.0-RELEASE/8.0-RELEASE/ports/ports.tgz 2.392u 5.000s 10:24.15 1.1% 64+1095k 8375+2735io 0pf+0w newfs -U -f 4096 -b 32768 # time tar xfj /install/releases/i386/8.0-RELEASE/8.0-RELEASE/ports/ports.tgz 2.547u 5.567s 1:25.50 9.4% 64+1088k 11880+1755io 0pf+0w On Wed, Mar 17, 2010 at 3:12 PM, Olivier Smedts <olivier@gid0.org> wrote: > 2010/3/17 Thiago Damas <tdamas@gmail.com>: > > I had problem with ZFS. > > With gnop -S 4096, it works well on /dev/ad{a}X.nop; but I decided to > not > > use those disks. > > So maybe this was not a ZFS problem but a partition misalignment problem ? > > On a properly aligned partition with a physical sector size of 4KB and > a logical sector size of 512 bytes, will ZFS try to use blocksizes of > less than 4KB ? Blocksize in ZFS seems to be dynamic (at least when > not told to use a fixed blocksize), but I didn't see somewhere in the > manpage or Sun's website which minimum blocksize ZFS would use for > small files, and if there is a lower limit on blocksizes to use. > > > > > > > 2010/3/17 Mohacsi Janos <mohacsi@niif.hu> > > > >> > >> > >> > >> On Wed, 17 Mar 2010, Dag-Erling Sm?rgrav wrote: > >> > >> Mohacsi Janos <mohacsi@niif.hu> writes: > >>> > >>>> What is the situation with ATA 4K dirves in FreeBSD? Are there > >>>> any support for them in fdisk or disklabel? > >>>> > >>> > >>> Hmm, didn't we discuss this already? All we need to do is change the > >>> defaults in fdisk so it rounds partition offsets and sizes to a > multiple > >>> of 8 sectors (or 16 for future-proofing) instead of aligning them with > >>> fictitious cylinder boundaries. Bsdlabel, as disklabel is properly > >>> known, already DTRT: by default, the first partition starts at offset > >>> 16. Just make sure you specify sizes that are divisible by 8 or 16 > >>> blocks (not an issue if you use the M or G suffixes). Sysinstall > >>> operates in megabytes. > >>> > >> > >> Thanks for the information. > >> > >> > >> _______________________________________________ > >> freebsd-hackers@freebsd.org mailing list > >> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > >> To unsubscribe, send any mail to " > freebsd-hackers-unsubscribe@freebsd.org" > >> > > _______________________________________________ > > freebsd-hackers@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > > To unsubscribe, send any mail to " > freebsd-hackers-unsubscribe@freebsd.org" > > > > > > -- > Olivier Smedts _ > ASCII ribbon campaign ( ) > e-mail: olivier@gid0.org - against HTML email & vCards X > www: http://www.gid0.org - against proprietary attachments / \ > > "Il y a seulement 10 sortes de gens dans le monde : > ceux qui comprennent le binaire, > et ceux qui ne le comprennent pas." >
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