Date: Tue, 22 May 2012 07:42:18 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Matthias Apitz <guru@unixarea.de> Cc: 'User Wojtek' <wojtek@wojtek.tensor.gdynia.pl>, rozhuk.im@gmail.com, freebsd-hackers@freebsd.org Subject: Re: proper newfs options for SSD disk Message-ID: <alpine.BSF.2.00.1205220731070.51493@wonkity.com> In-Reply-To: <20120522061734.GA1210@tiny> References: <alpine.BSF.2.00.1205182209010.9350@wojtek.tensor.gdynia.pl> <4fb7dfd6.736a980a.186d.ffff902f@mx.google.com> <20120519180901.GA1264@tiny> <4fb7e819.6968700a.7a7f.ffff9153@mx.google.com> <20120522061734.GA1210@tiny>
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On Tue, 22 May 2012, Matthias Apitz wrote: > El día Sunday, May 20, 2012 a las 03:36:01AM +0900, rozhuk.im@gmail.com escribió: >> >> Do not use MBR (or manually do all to align). >> 63 - not 4k aligned. > > To create the above shown partition layout I have not used gpart(8); I > just said: > > # fdisk -I /dev/ada0 > # fdisk -B /dev/ada0 > > # bsdlabel -w ada0s1 auto > # bsdlabel -B ada0s1 > > changed partition "a" from "unused" to "4.2BSD" as partition type: > > # setenv EDITOR /usr/bin/vi > # bsdlabel -e ada0s1 > > created the future root-filesystem on it > > # newfs -m 0 -o space /dev/ada0s1a > > The 2nd SSD was formated like this: > > # dd if=/dev/zero of=/dev/ada1 count=2 > # fdisk -I /dev/ada1 > # newfs -m 0 -o space /dev/ada1s1a > # echo "/dev/ada1s1a /usr/local ufs rw,noatime 1 1" >> /etc/fstab > # mount /usr/local > > What is wrong with this procedure? The filesystem partitions end up at locations that aren't even multiples of 4K. This can reduce performance. How much probably depends on the SSD.help
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