Date: Sat, 2 Jun 2012 12:25:37 +0700 From: Victor Sudakov <vas@mpeks.tomsk.su> To: freebsd-questions@freebsd.org Subject: Re: 9.0 on SSD Message-ID: <20120602052537.GA42456@admin.sibptus.tomsk.ru> In-Reply-To: <alpine.BSF.2.00.1205311847570.85245@wonkity.com> References: <20120531025206.GA11699@admin.sibptus.tomsk.ru> <alpine.BSF.2.00.1205310652350.81499@wonkity.com> <20120531170035.GA29456@admin.sibptus.tomsk.ru> <alpine.BSF.2.00.1205311847570.85245@wonkity.com>
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Warren Block wrote: [dd] > >>> I have not done any tricky partition alignment, do I really need to? Is > >>> anything else advisable? > >> > >> If it's not aligned, there can be a pretty significant performance > >> drop. Please show the output of 'gpart show' on that drive if it's GPT > >> (gpart show ada0) or drive and slice if it's MBR/bsdlabel (gpart show > >> ada0 && gpart show ada0s1). > > > > It was created by the "Auto" option of the new FreeBSD installer: > > > > [sudakov@vas ~] gpart show ada0 > > => 34 117231341 ada0 GPT (55G) > > 34 128 1 freebsd-boot (64k) > > 162 111148928 2 freebsd-ufs (53G) > > 111149090 5861376 3 freebsd-swap (2.8G) > > 117010466 220909 - free - (107M) > > That is not aligned, either with 4K or 1M: > (162*512)/4096 = 20.25 > > If the performance is good enough, leave it alone. Use > # diskinfo -tv /dev/ada0p2 > to get an optimistic version, or do some in-depth benchmarking with > benchmarks/bonnie++. > > To get it aligned, back up and repartition: [dd] Warren, Thank you very much for the useful tips. One more question regarding SSD. The FreeBSD installer enabled journaled soft-updates on the filesystem which resides on the SSD. Is it good, bad or irrelevant for the SSD ? /dev/ada0p2 on / (ufs, local, noatime, journaled soft-updates, nfsv4acls) -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:sudakov@sibptus.tomsk.ru
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