Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965609AbWKDVBO (ORCPT ); Sat, 4 Nov 2006 16:01:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965687AbWKDVBO (ORCPT ); Sat, 4 Nov 2006 16:01:14 -0500 Received: from lug-owl.de ([195.71.106.12]:30682 "EHLO lug-owl.de") by vger.kernel.org with ESMTP id S965609AbWKDVBN (ORCPT ); Sat, 4 Nov 2006 16:01:13 -0500 Date: Sat, 4 Nov 2006 22:01:11 +0100 From: Jan-Benedict Glaw To: Albert Cahalan Cc: kangur@polcom.net, mikulas@artax.karlin.mff.cuni.cz, linux-kernel@vger.kernel.org Subject: Re: New filesystem for Linux Message-ID: <20061104210111.GB21485@lug-owl.de> Mail-Followup-To: Albert Cahalan , kangur@polcom.net, mikulas@artax.karlin.mff.cuni.cz, linux-kernel@vger.kernel.org References: <787b0d920611041159y6171ec25u92716777ce9bea4a@mail.gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="IiVenqGWf+H9Y6IX" Content-Disposition: inline In-Reply-To: <787b0d920611041159y6171ec25u92716777ce9bea4a@mail.gmail.com> X-Operating-System: Linux mail 2.6.12.3lug-owl X-gpg-fingerprint: 250D 3BCF 7127 0D8C A444 A961 1DBD 5E75 8399 E1BB X-gpg-key: wwwkeys.de.pgp.net X-Echelon-Enable: howto poison arsenous mail psychological biological nuclear warfare test the bombastical terror of flooding the spy listeners explosion sex drugs and rock'n'roll X-TKUeV: howto poison arsenous mail psychological biological nuclear warfare test the bombastical terror of flooding the spy listeners explosion sex drugs and rock'n'roll User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2338 Lines: 63 --IiVenqGWf+H9Y6IX Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, 2006-11-04 14:59:53 -0500, Albert Cahalan wrot= e: > Grzegorz Kulewski writes: > > On Thu, 2 Nov 2006, Mikulas Patocka wrote: > > > As my PhD thesis, I am designing and writing a filesystem, > > > and it's now in a state that it can be released. You can > > > download it from http://artax.karlin.mff.cuni.cz/~mikulas/spadfs/ > > > > "Disk that can atomically write one sector (512 bytes) so that > > the sector contains either old or new content in case of crash." >=20 > New drives will soon use 4096-byte sectors. This is a better > match for the normal (non-VAX!) page size and reduces overhead. Well... VAXen use physical PTEs for 512 byte pages, Linux uses 8 consecutive pages to simulate 4K pages. On top of that, some of today's machines have configurable page sizes. Besides that, 512 byte sectors are quite a clever thing: Drives probably can write a number of consecutive sectors, so if you want to send a page, just send eight sectors. > BTW, a person with disk recovery experience told me that drives > will sometimes reorder the sectors. Sector 42 becomes sector 7732, > sector 880880 becomes sector 12345, etc. The very best filesystems > can handle with without data loss. (for example, ZFS) Merely great > filesystems will at least recognize that the data has been trashed. Uh? This should be transparent to the host computer, so logical sector numbers won't change. MfG, JBG --=20 Jan-Benedict Glaw jbglaw@lug-owl.de +49-172-7608481 Signature of: http://catb.org/~esr/faqs/smart-questions.html the second : --IiVenqGWf+H9Y6IX Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD4DBQFFTP+XHb1edYOZ4bsRAm/sAJ9XWGumJ+Jw0xNW78LwOfENneZ5XgCY1OUa ZRrxpYKYOBUNRm0BocCAZQ== =rBhj -----END PGP SIGNATURE----- --IiVenqGWf+H9Y6IX-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/