From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robin Hill Subject: Re: Linux mdadm superblock question. Date: Fri, 12 Feb 2010 09:06:33 +0000 Message-ID: <20100212090632.GA17020@cthulhu.home.robinhill.me.uk> References: <4877c76c1002111752h23e14f7aibe58a89181e6f493@mail.gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="tKW2IUtsqtDRztdT" Return-path: Content-Disposition: inline In-Reply-To: <4877c76c1002111752h23e14f7aibe58a89181e6f493@mail.gmail.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids --tKW2IUtsqtDRztdT Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu Feb 11, 2010 at 05:52:41PM -0800, Michael Evans wrote: > On Thu, Feb 11, 2010 at 3:00 PM, Justin Piszcz = wrote: > > Hi, > > > > I may be converting a host to ext4 and was curious, is 0.90 still the o= nly > > superblock version for mdadm/raid-1 that you can boot from without havi= ng to > > create an initrd/etc? > > > > Are there any benefits to using a superblock > 0.90 for a raid-1 boot v= olume > > < 2TB? > > > > Justin. >=20 > You need the superblock at the end of the partition: If you read the > manual that is clearly either version 0.90 OR 1.0 (NOT 1.1 and also > NOT 1.2; those use the same superblock layout but different > locations). >=20 You also need it to be auto-assembled by the kernel, which is only version 0.90. As for benefits, there's a number of benefits of 1.x over 0.90 - I don't think any of them are terribly important for a small boot partition though. There's also benefits to having an initrd anyway. Cheers, Robin --=20 ___ =20 ( ' } | Robin Hill | / / ) | Little Jim says .... | // !! | "He fallen in de water !!" | --tKW2IUtsqtDRztdT Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) iEYEARECAAYFAkt1GhgACgkQShxCyD40xBJftQCcDO5P2rIRkeceaGXGKmQKs8Wz MUUAn00pUXrV5xDWByxzupnAf/idk5ed =OZSd -----END PGP SIGNATURE----- --tKW2IUtsqtDRztdT--