From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: metadata 1.2 advantages? Date: Thu, 9 Feb 2012 12:02:47 +1100 Message-ID: <20120209120247.1d2629c2@notabene.brown> References: <4F323A00.8050506@profihost.ag> <4F32F435.60405@zytor.com> <20120209105934.36189d93@notabene.brown> <4F331570.7010800@zytor.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/XH.zcJ.1W+IAOqjUIA2jU/S"; protocol="application/pgp-signature" Return-path: In-Reply-To: <4F331570.7010800@zytor.com> Sender: linux-raid-owner@vger.kernel.org To: "H. Peter Anvin" Cc: Stefan Priebe - Profihost AG , linux-raid@vger.kernel.org List-Id: linux-raid.ids --Sig_/XH.zcJ.1W+IAOqjUIA2jU/S Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Wed, 08 Feb 2012 16:38:08 -0800 "H. Peter Anvin" wrote: > On 02/08/2012 03:59 PM, NeilBrown wrote: > > On Wed, 08 Feb 2012 14:16:21 -0800 "H. Peter Anvin" > > wrote: > >=20 > >> On 02/08/2012 01:01 AM, Stefan Priebe - Profihost AG wrote: > >>> Hi, > >>>=20 > >>> for now i'm still using grub 0.97 which can only understand > >>> metadata 0.9. Are there any advantages of the 1.2 metadata > >>> format? > >>>=20 > >>=20 > >> There are a lot of advantages to the 1.x metadata format, but 1.0 > >> is the easiest for bootloaders to deal with. 1.0, 1.1 and 1.2 is > >> the same format, just with the superblock in different places. > >=20 > > Hi Peter, wasn't it you who told be that 1.2 was best for boot > > loaders, as 1.0 uses block 0 which the bootloader also wants, while > > 1.2 uses a later block. That is why 1.2 is the default. > >=20 >=20 > No, 1.1 uses block 0 which the bootloader wants. >=20 > Bootloaders need no special enabling to support 0.9 or 1.0 RAID-1. > 1.2 requires special enabling, but is workable. Doh - of course. Wasn't thinking straight. So 1.0 is good for boot loaders 1.1 is bad for boot loaders 1.2 is OK for boot loaders and good for other reasons (resizeable device= s). Thanks, NeilBrown --Sig_/XH.zcJ.1W+IAOqjUIA2jU/S Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUBTzMbNznsnt1WYoG5AQIYehAAj9TNkK2NouFpSoEhHHPoy7nj5xegj7HJ fD9aMgHzksbH9RMBdnDP6+UVMaqlLRFQoecszqUQltki7PyOc/J//14OQBhZfn+9 OBul9Ve0hfPWL3fcsz3jXBMjlkS6TOws7anR7hH/2WfQJyIUIwdQZ36hvjlCs7ch WZYvVKxLSGClTwU+/kKxjbxWr+bat9OFwbRflXMseIuCmtqZ25J/vjyq+YyfJT7P 1FKvZoZfUnAzedT3c4gN8uOub6Hf/16vNsio9Vu8NTuER6xSb+begbu5srGDkB6p OQQCWpaEs1u8c6GLz374/4kxYq4iMmOux4hJaMqaPwq9L436k+NwLzKwg1Vc8GHN UpX7Sk89rs45MfC+0OTOMQBZmVVLf0tizKNuQ5N+06Wvhp52w0Q0j5j4W97Lt4jN vnDYsKmxMP2xWox1LZ1rgipF14la3mlHnW0u/oiSNOdhrqX8AWLWp+NGuoOjNbAP Zb31GAUDTEz996Oiudgm4xbCrdheqXR7e7N0t83e5upUuvg2uhK3gnbQiQgmZCgK NwH1pDwqIFxinBzSJ67H45+MSNTfxt4H4WbqnnpQ3U+7OYEUmvkYcpNiCb+vpo67 72NREex7AZZ7CBJWstboqNdJ60OJOSlwI7KHzJyLOInHWdgL7TMhaOWZR7NmYOqp HS8nK/K9fp0= =Bc1Y -----END PGP SIGNATURE----- --Sig_/XH.zcJ.1W+IAOqjUIA2jU/S--