From owner-freebsd-fs@FreeBSD.ORG Wed Jun 13 10:18:16 2012 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 40A8D106564A for ; Wed, 13 Jun 2012 10:18:16 +0000 (UTC) (envelope-from olivier@gid0.org) Received: from mail-lb0-f182.google.com (mail-lb0-f182.google.com [209.85.217.182]) by mx1.freebsd.org (Postfix) with ESMTP id B1CFD8FC15 for ; Wed, 13 Jun 2012 10:18:15 +0000 (UTC) Received: by lbon10 with SMTP id n10so1367817lbo.13 for ; Wed, 13 Jun 2012 03:18:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding:x-gm-message-state; bh=zCBA62jd//LY1/BUdrKRlNwkLTyC3yQ2rAvxiJYE43c=; b=giz2NraZnFZPIEWkiVxwbM9bXl/Vbt9xtCjPfbGf6NGJVNFDu0S6Jxqc7SWkH/R72R gBG/iFNy5o3Y4093lGPuxJ4KKLpRFNmFE45BLh5DWy7qbUoKiqBCJPT4jO4eaiZxQoFx E74Ko/MAkkxeuMlFeQFWfcUC626uqzQact9WC0qyYJwrv42oBFpDU0xd6IVX3Jy0C9m9 4zS3BTo+g6K5IouwOaNC6T5VBaCnyqKO2SMZ9xl7qlX/ryV9PzzHWi9iVzSQnMYYsICK gxQ6LPkgW/zfjrLby6Uu9jXoo/OrZTlF52+F7lEZ+sP5XnbLm6lg8GBRld/PcXZzP7Ef 6eCw== MIME-Version: 1.0 Received: by 10.152.148.169 with SMTP id tt9mr23686015lab.49.1339582694333; Wed, 13 Jun 2012 03:18:14 -0700 (PDT) Received: by 10.112.100.68 with HTTP; Wed, 13 Jun 2012 03:18:14 -0700 (PDT) In-Reply-To: References: Date: Wed, 13 Jun 2012 12:18:14 +0200 Message-ID: From: Olivier Smedts To: Irjohn Junus Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Gm-Message-State: ALoCoQldMJpN/o9fzjdIJHU6s6QMP4zbgb3CccGVBRnD52TcXHCTwtSYQZO9pQdpUIrKws8ItknS Cc: freebsd-fs@freebsd.org Subject: Re: gpart add -a 4096 vs 4k X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Jun 2012 10:18:16 -0000 Hello, 2012/6/13 Irjohn Junus : > Hello, > > Relatively new to FreeBSD and learning, I'm trying to partition my HDD an= d > align it to 4k sector. > > I do apologize if this has been answered before, I have Googled and read > gpart(8) man page to no joy. Can anyone please advice why gpart add '-a > 4096' doesn't yield the same result with '-a 4k'? Many thanks and capture= s > are below. > > Regards, > Ronjns > > > > #gpart add -t freebsd-zfs -l hdd0 *-a 4096* da0 > da0p1 added > # gpart show da0 > =3D> =A0 =A0 =A0 =A034 =A03907029101 =A0da0 =A0GPT =A0(1.8T) > =A0 =A0 =A0 =A0 =A034 =A0 =A0 =A0 =A04062 =A0 =A0 =A0 - free - =A0(2M) > =A0 =A0 =A0 =A0*4096 =A03907022848* =A0 =A01 =A0freebsd-zfs =A0(1.8T) > =A03907026944 =A0 =A0 =A0 =A02191 =A0 =A0 =A0 - free - =A0(1.1M) > > > > # gpart add -t freebsd-zfs -l hdd0 *-a 4k* da0 > da0p1 added > # gpart show da0 > =3D> =A0 =A0 =A0 =A034 =A03907029101 =A0da0 =A0GPT =A0(1.8T) > =A0 =A0 =A0 =A0 =A034 =A0 =A0 =A0 =A0 =A0 6 =A0 =A0 =A0 - free - =A0(3.0k= ) > =A0 =A0 =A0 =A0 =A0*40 =A03907029088* =A0 =A01 =A0freebsd-zfs =A0(1.8T) > =A03907029128 =A0 =A0 =A0 =A0 =A0 7 =A0 =A0 =A0 - free - =A0(3.5k) We're talking of sectors here, se "4096" does not mean 4 KB but 4096*512=3D= 2MB. I think you should use "-a 8", because 4k sectors =3D 8*512B sectors. --=20 Olivier Smedts=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=A0 _ =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 ASCII ribbon campaign ( ) e-mail: olivier@gid0.org=A0 =A0 =A0 =A0 - against HTML email & vCards=A0 X www: http://www.gid0.org=A0 =A0 - against proprietary attachments / \ =A0 "Il y a seulement 10 sortes de gens dans le monde : =A0 ceux qui comprennent le binaire, =A0 et ceux qui ne le comprennent pas."