Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422707AbWKEVtf (ORCPT ); Sun, 5 Nov 2006 16:49:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422679AbWKEVtf (ORCPT ); Sun, 5 Nov 2006 16:49:35 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:41690 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S1422707AbWKEVte (ORCPT ); Sun, 5 Nov 2006 16:49:34 -0500 Date: Sun, 5 Nov 2006 22:49:03 +0100 From: Pavel Machek To: Mikulas Patocka Cc: Albert Cahalan , kangur@polcom.net, linux-kernel@vger.kernel.org Subject: Re: New filesystem for Linux Message-ID: <20061105214903.GC1847@elf.ucw.cz> References: <787b0d920611041159y6171ec25u92716777ce9bea4a@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1263 Lines: 28 Hi! > >>>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." > > > >New drives will soon use 4096-byte sectors. This is a better > >match for the normal (non-VAX!) page size and reduces overhead. > > The drive (IDE model, SCSI can have larger sector size) will do > read-modify-write for smaller writes. So there should be no compatibility > issues. (this possibility is in new ATA standard and there is a way how to Actually, there are. If you assume powerfail can only destroy 512 bytes... read-modify-write of 4K is going to destroy your "only 512 bytes destroyed" assumption... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - 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/