Date: Sun, 25 Jul 2010 14:22:17 +0700 From: Edho P Arief <edhoprima@gmail.com> To: Adam Vande More <amvandemore@gmail.com> Cc: freebsd-stable <freebsd-stable@freebsd.org>, Dan Langille <dan@langille.org> Subject: Re: gpart -b 34 versus gpart -b 1024 Message-ID: <AANLkTi=RGe7ygDYpF2u3BN4oPYSgyUUijOuLnz2q=XXY@mail.gmail.com> In-Reply-To: <AANLkTinKEBb5S9REK3nn8GF3U=jRAtYMBBfsC5TB8Xj4@mail.gmail.com> References: <4C4BA50B.6050507@langille.org> <4C4BB672.3090109@langille.org> <AANLkTinKEBb5S9REK3nn8GF3U=jRAtYMBBfsC5TB8Xj4@mail.gmail.com>
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On Sun, Jul 25, 2010 at 12:37 PM, Adam Vande More <amvandemore@gmail.com> w= rote: > On Sat, Jul 24, 2010 at 10:58 PM, Dan Langille <dan@langille.org> wrote: > >> =C2=A0 =C2=A0 =C2=A0 -------Sequential Output-------- ---Sequential Inpu= t-- --Random-- >> =C2=A0 =C2=A0 =C2=A0 -Per Char- --Block--- -Rewrite-- -Per Char- --Block= --- --Seeks--- >> =C2=A0 =C2=A0GB M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU = =C2=A0/sec %CPU >> =C2=A0 =C2=A050 110.5 81.0 112.8 15.0 =C2=A062.8 =C2=A09.0 =C2=A072.9 48= .5 139.7 =C2=A09.5 =C2=A0 144 =C2=A00.9 >> >> Here, the results aren't much better either... =C2=A0am I not aligning t= his >> partition correctly? =C2=A0Missing something else? =C2=A0Or... are they = both 4K block >> aligned? > > > The alignment doesn't apply to all drives, just the 4k WD's and some ssd'= s. > > If they were misaligned, you would see a large difference in the tests. = =C2=A0A > few points one way or other in these is largely meaningless. > > That being said, if I were you I would set -b 2048(1 MB) as the default, = the > amount of space wasted is trivial and your partition will always be > aligned. =C2=A0People following your tutorials may have a variety of diff= erent > drives and that setting is safe for all. > shouldn't it start at 2049? Starting at 2048 means it starts at 2048th logical block which is 512 bytes off from physical block, doesn't it? --=20 O< ascii ribbon campaign - stop html mail - www.asciiribbon.org
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