From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932115AbWGCUza (ORCPT ); Mon, 3 Jul 2006 16:55:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932116AbWGCUza (ORCPT ); Mon, 3 Jul 2006 16:55:30 -0400 Received: from nsm.pl ([195.34.211.229]:53783 "EHLO nsm.pl") by vger.kernel.org with ESMTP id S932115AbWGCUz3 (ORCPT ); Mon, 3 Jul 2006 16:55:29 -0400 Date: Mon, 3 Jul 2006 22:55:23 +0200 From: Tomasz Torcz To: Helge Hafting Cc: Thomas Glanzmann , "Theodore Ts'o" , LKML Subject: Re: ext4 features Message-ID: <20060703205523.GA17122@irc.pl> Mail-Followup-To: Helge Hafting , Thomas Glanzmann , Theodore Ts'o , LKML References: <20060701163301.GB24570@cip.informatik.uni-erlangen.de> <20060701170729.GB8763@irc.pl> <20060701174716.GC24570@cip.informatik.uni-erlangen.de> <20060701181702.GC8763@irc.pl> <20060703202219.GA9707@aitel.hist.no> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="AhhlLboLdkugWU4S" Content-Disposition: inline In-Reply-To: <20060703202219.GA9707@aitel.hist.no> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --AhhlLboLdkugWU4S Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jul 03, 2006 at 10:22:19PM +0200, Helge Hafting wrote: > On Sat, Jul 01, 2006 at 08:17:02PM +0200, Tomasz Torcz wrote: > > On Sat, Jul 01, 2006 at 07:47:16PM +0200, Thomas Glanzmann wrote: > > > Hello, > > >=20 > > > > Checksums are not very useful for themselves. They are useful when = we > > > > have other copy of data (think raid mirroring) so data can be > > > > reconstructed from working copy. > > >=20 > > > it would be possible to identify data corruption. > > >=20 > >=20 > > Yes, but what good is identification? We could only return I/O error. > > Ability to fix corruption (like ZFS) is the real killer. >=20 > Isn't that what we have RAID-1/5/6 for? =20 ZFS was already called ,,blatant layering violation''. ;) Yes,that what RAID is for. And if we want checksums in filesystem, that's the best way to utilise them. --=20 Tomasz Torcz Morality must always be based on practicality. zdzichu@irc.-nie.spam-.pl -- Baron Vladimir Harkonnen --AhhlLboLdkugWU4S Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) Comment: gpg --search-keys Tomasz Torcz iD8DBQFEqYQ7ThhlKowQALQRAgzIAKCWdKQrjl0ftWw2zfbEmQ6OBDNg6QCfaA6o JOPPcoyrHSj7/b/ixFJMAeQ= =SdSI -----END PGP SIGNATURE----- --AhhlLboLdkugWU4S--