From owner-freebsd-questions@FreeBSD.ORG Wed Nov 14 01:22:18 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 417A781E for ; Wed, 14 Nov 2012 01:22:18 +0000 (UTC) (envelope-from gull@gull.us) Received: from mail-vb0-f54.google.com (mail-vb0-f54.google.com [209.85.212.54]) by mx1.freebsd.org (Postfix) with ESMTP id E17BB8FC0C for ; Wed, 14 Nov 2012 01:22:17 +0000 (UTC) Received: by mail-vb0-f54.google.com with SMTP id l1so10581566vba.13 for ; Tue, 13 Nov 2012 17:22:16 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-originating-ip:in-reply-to:references:date :message-id:subject:from:to:cc:content-type:x-gm-message-state; bh=ZFvxC5ZnwtprLhbc3fPKkfuHyZtXq6sBzt4Jk49xhuE=; b=lCLP3CJk89YROvdZHocAW6yhaIVHnBgtVn6FhZOHG4cLysTDnLfFZE5qCnNwwq7992 jWA9Krl5t0adHgxciAGlnyGjw6XHSdaiMrCI2WkXPafB8xkPVh16XdT/aFCO3i3tQIee zmSxkt5qv5KR8aDiIvvw0mj3Ixy8DHUwvyfKaV2Qk9prqYr86f5EuOeezi1GmCml8v2y oWO8AitkASHWVl0jS6INgtlhlm3kHI1ZaPh4P97Y2+9ssPgc/SuaturYjvrllytWfzrv Ddqqigvb8554CXfZqMR1Zo6+c6GEJ/jLll69D0zfvvX9aXtRiEf0SyVNPyRMwLRPWMOH HuIw== MIME-Version: 1.0 Received: by 10.58.172.103 with SMTP id bb7mr30127766vec.41.1352856136616; Tue, 13 Nov 2012 17:22:16 -0800 (PST) Received: by 10.58.226.202 with HTTP; Tue, 13 Nov 2012 17:22:16 -0800 (PST) X-Originating-IP: [128.95.17.211] In-Reply-To: <4073.1352844470@tristatelogic.com> References: <20121113073030.87bc0608.freebsd@edvax.de> <4073.1352844470@tristatelogic.com> Date: Tue, 13 Nov 2012 17:22:16 -0800 Message-ID: Subject: Re: Advanced Format Drive ? From: David Brodbeck To: "Ronald F. Guilmette" X-Gm-Message-State: ALoCoQle3oNRjTqq5fFM9AW0BgQZe4dykxp06C334ru4XgZLAo8fZne/34pr7odxFxqzGxlY/gdg Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.14 Cc: freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Nov 2012 01:22:18 -0000 On Tue, Nov 13, 2012 at 2:07 PM, Ronald F. Guilmette wrote: > >You can then easily use newfs with the -f parameter: > > > > newfs -U -f 4096 > > > >This will make sure the proper fragment size will be applied > >upon formatting the created partitions. > > OK. Thanks. I am guessing that this is really the one and probably > _only_ thing that might really make any significant difference, > performance- > wise, right? I mean if the partition is improperly aligned, that really > only would affect reading and/or writing at the very beginning or at the > very end of the partition, right? No, I think it'll affect the whole thing, because every block will be straddling two 4k sectors instead of filling one. Then the drive has to read and rewrite two sectors for every one block you write, instead of just one, slowing things down to half speed. Imagine running across the top of a picket fence...if you start half a fencepost off things are going to be painful. ;)