Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756917AbYCNJar (ORCPT ); Fri, 14 Mar 2008 05:30:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755282AbYCNJai (ORCPT ); Fri, 14 Mar 2008 05:30:38 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:1080 "EHLO spitz.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752610AbYCNJah (ORCPT ); Fri, 14 Mar 2008 05:30:37 -0400 Date: Fri, 14 Mar 2008 10:30:20 +0100 From: Pavel Machek To: Alan Cox Cc: Benny Amorsen , linux-kernel@vger.kernel.org Subject: Re: [ANNOUNCE] Ramback: faster than a speeding bullet Message-ID: <20080314093019.GA5966@ucw.cz> References: <200803092346.17556.phillips@phunq.net> <200803110450.19390.phillips@phunq.net> <20080311215601.GM23784@marowsky-bree.de> <200803111602.53835.phillips@phunq.net> <20080312133001.1668f40d@the-village.bc.nu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080312133001.1668f40d@the-village.bc.nu> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 994 Lines: 22 Hi! > > Everyone who has write cache turned on for their hard drives is > > running in a mode similar to ramback anyway (except for when the file > > system is set to force writes to the platter, but that is rare). > > Admittedly, software crashes rarely cause the write cache to be lost, > > but hardware failures do, practically every time. > > On the contrary - the hard disk cache is managed by the barrier logic in > the kernel, and the ordering even on failures is fairly predictable. Well, not even all modern hdds support barriers... It would be really nice to have _safe_ settings by default here... -- (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/