From owner-freebsd-questions@FreeBSD.ORG Thu Dec 10 08:04:30 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6F6D2106566C for ; Thu, 10 Dec 2009 08:04:30 +0000 (UTC) (envelope-from anti_spam256@yahoo.ca) Received: from web65514.mail.ac4.yahoo.com (web65514.mail.ac4.yahoo.com [76.13.9.58]) by mx1.freebsd.org (Postfix) with SMTP id 288868FC14 for ; Thu, 10 Dec 2009 08:04:29 +0000 (UTC) Received: (qmail 23210 invoked by uid 60001); 10 Dec 2009 08:04:29 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.ca; s=s1024; t=1260432269; bh=pK61NgwnIZgnR3XEfXXCKVnhlaGzGULxiKIF0bFzxig=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=JAIhqjM4taeo07cHIcyDXl5LUY/9mmMm7vJJJi9zjjlfun7U233x2fRF5or8X3uoVKg+ozYyZyMtnU+R6m8p5teZkmuvswVs84409jsYMUEOJBx70RolDdYEGSWk/TL46Kuy2ydNP7H+woQgF0c/FNZwJDUmLNMpzyhYlGfeUuI= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.ca; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=zuuyA19epIL7aD4tGCGxSo7RwavAAcztQyQxN+r6rhGLLT9wZvi9cP4K2sXvoke14+lzA+hdPUQC6ez+TIt51mAec3f2KZlWuVxJLuZHpX1TzfSJIzVEwu2Ipze0tbLAGPzNDb5geHpT5wKdzMZguMvqdBh/yUJ32izyyJufF40=; Message-ID: <291716.23061.qm@web65514.mail.ac4.yahoo.com> X-YMail-OSG: q_sUfYMVM1lsF9hNbXJWfN2JYzzwLoMybV8nKYeix1zuduuynp2Pzl6WxS9MTu0dmiRmQZqlE_7.FZQr1_6pUeSDdmHgS_gWg1Up0Sp2Mkgu2pRJd9VjVxbepXWjRchSrl887u3CtHomfOnzT.iqESA0y4jo7p4yHlgsZPamUGawiHWN1VWbS.Lhjn3ehfZDhJy5ndM66CMz1CjmnH3s.KqAQifPGEmh_t7wOVUeSKRfdBbqwWN3aB4OQcDxRD2Kcyg51sFUmvIPOGieLHotMFjtjawxwdyVXL_KPPmYHpHJoUmQHSVBq8uEbT.AldpyMfXrdfVowOG9cTKUBrIgf1oAVVFYgZ4SZ7fcUETY3scR1G0_rEKqmkODTjiTnJL9nlzISBC71oiiIHoyoYdmbrLj009KFO9cRLGHHnVaPHyW9LYtQFmSQ..78FcNIaTS_II- Received: from [208.99.137.71] by web65514.mail.ac4.yahoo.com via HTTP; Thu, 10 Dec 2009 00:04:28 PST X-Mailer: YahooMailClassic/9.0.19 YahooMailWebService/0.8.100.260964 Date: Thu, 10 Dec 2009 00:04:28 -0800 (PST) From: James Phillips To: freebsd-questions@freebsd.org In-Reply-To: <20091210043133.3AF5110656DC@hub.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: Dangerously Dedicated X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Dec 2009 08:04:30 -0000 > Date: Thu, 10 Dec 2009 03:12:45 +0100 > From: Polytropon > Subject: Re: Dangerously Dedicated > To: Maxim Khitrov > Cc: freebsd-questions@freebsd.org > Message-ID: <20091210031245.3fd58187.freebsd@edvax.de> > Content-Type: text/plain; charset=3DUS-ASCII >=20 > On Wed, 9 Dec 2009 20:41:40 -0500, Maxim Khitrov=20 > wrote: > > On Wed, Dec 9, 2009 at 8:33 PM, Rolf Nielsen > > > wrote: > > > As far as I understand it, it's called > Dangerously Dedicated because it may > > > cause other systems not to recognise the disk. > Consequently, newfs'ing a > > > slice without first partitioning it can hardly be > DD, since that is what > > > other systems do, right? I think I understand: using the DOS compatible partition (slice)=20 table follows the principle of "least surprise." That is why I use=20 "slices" for my dedicated BSD machine. 4 places to put your data are=20 ostensibly better than 1, and I avoid any possible BIOS bugs if the=20 BIOS sees a "non-standard" MBR.=20 > >=20 > > That is correct. That slice will not be bootable, but > you can use it > > to store data. >=20 > Being bootable is a matter of what the MBR boot block > says. In a DD setting, it refers to the first partition > (that's not within a slice), e. g. ad0a. Especially in > a multi-OS setting, the use of slices seems to be > strongly recommended so all operating systems behave > in the required way (due to compatibility reasons, > see "DOS primary partitions"), which limits the number > of slices to 4. I would say a common partition format is REQUIRED in a multi-boot=20 situation. For PC OS's, that means DOS compatibility. =20 > For plain storage, it's not needed to encapsulate the > partition with the file system inside a slice, e. g. >=20 > =C2=A0=C2=A0=C2=A0 ad1=C2=A0 ad1s1=C2=A0 ad1s1e > =C2=A0=C2=A0=C2=A0 {=C2=A0 =C2=A0 [=C2=A0 =C2=A0 =C2=A0 > (/data)=C2=A0 ]=C2=A0 } >=20 > in comparison to >=20 > =C2=A0=C2=A0=C2=A0 ad1=C2=A0 ad1c > =C2=A0=C2=A0=C2=A0 {=C2=A0 =C2=A0 (/data)=C2=A0 } >=20 > And as it is known, the "c" can be omitted, as in >=20 > =C2=A0=C2=A0=C2=A0 # mount /dev/ad1 /data >=20 >=20 The Detailed 8.0 release notes don't say anything about bootability: 2.2.5 File Systems =E2=80=9Cdangerously dedicated=E2=80=9D mode for the UFS file sys= tem=20 is no longer supported http://www.freebsd.org/releases/8.0R/relnotes-detailed.html I also note that the DOS partition (slice) table is not explictly=20 required either: could you use an Apple partiton (slice) table=20 instead?=20 UFS not supporting DD mode struck me as weird BECAUSE it has to work=20 with different architectures.=20 Of course, if you are just storing raw data, you don't always *need*=20 a filesystem.=20 Regards, James Phillips=0A=0A=0A ______________________________________________= ____________________=0AYahoo! Canada Toolbar: Search from anywhere on the w= eb, and bookmark your favourite sites. Download it now=0Ahttp://ca.toolbar.= yahoo.com.