Date: Thu, 24 May 2012 08:16:26 -0400 From: Andrew Duane <aduane@juniper.net> To: Tim Kientzle <tim@kientzle.com>, Warren Block <wblock@wonkity.com> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Apitz <guru@unixarea.de>, Matthias Subject: RE: proper newfs options for SSD disk Message-ID: <AC6674AB7BC78549BB231821ABF7A9AEB82FBA1E2A@EMBX01-WF.jnpr.net> In-Reply-To: <CF851064-F78F-44AF-B562-32012E4DC043@kientzle.com> 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> <alpine.BSF.2.00.1205220731070.51493@wonkity.com> <20120522134846.GA2274@tiny> <alpine.BSF.2.00.1205220837500.51493@wonkity.com> <CF851064-F78F-44AF-B562-32012E4DC043@kientzle.com>
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> -----Original Message----- > From: owner-freebsd-hackers@freebsd.org [mailto:owner-freebsd-hackers@fre= ebsd.org] On Behalf Of Tim Kientzle > Sent: Thursday, May 24, 2012 12:49 AM > To: Warren Block > Cc: freebsd-hackers@freebsd.org; Matthias Apitz > Subject: Re: proper newfs options for SSD disk >=20 > GPart's alignment option doesn't work for MBR slices. > It rounds to the requested alignment, and then rounds again > to the track size, which defaults to 63 sectors. >=20 > I'm not convinced this is a bug in the design of MBR. I don't > think anything in the MBR design requires that partitions > be track-aligned. >=20 > Tim It really doesn't. This is old school thinking based around minimizing seek= and rotation time on slow multiplatter HDDs. It also helped the redundant = superblock layout scheme of UFS make that spiral striping down a set of dis= k platters. My bet is no one has ever bothered to rethink this in the 25 ye= ars since.... ................................... Andrew Duane Juniper Networks +1 978-589-0551 (o) +1 603-770-7088 (m) aduane@juniper.net =A0
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