Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758020AbZDQVH1 (ORCPT ); Fri, 17 Apr 2009 17:07:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752930AbZDQVHN (ORCPT ); Fri, 17 Apr 2009 17:07:13 -0400 Received: from smtp-vbr17.xs4all.nl ([194.109.24.37]:2899 "EHLO smtp-vbr17.xs4all.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752370AbZDQVHM (ORCPT ); Fri, 17 Apr 2009 17:07:12 -0400 Date: Fri, 17 Apr 2009 23:07:01 +0200 From: Folkert van Heusden To: Anton Ertl Cc: linux-kernel@vger.kernel.org Subject: Re: Out-of-order writing by disk drives Message-ID: <20090417210700.GD10554@vanheusden.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: www.unixexpert.nl X-Chameleon-Return-To: folkert@vanheusden.com X-Xfmail-Return-To: folkert@vanheusden.com X-Phonenumber: +31-6-41278122 X-URL: http://www.vanheusden.com/ X-PGP-KeyID: 1F28D8AE X-GPG-fingerprint: AC89 09CE 41F2 00B4 FCF2 B174 3019 0E8C 1F28 D8AE X-Key: http://pgp.surfnet.nl:11371/pks/lookup?op=get&search=0x1F28D8AE Read-Receipt-To: Reply-By: Sat Apr 18 21:15:00 CEST 2009 X-Message-Flag: MultiTail - tail on steroids User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1221 Lines: 26 > I have released a new version of hdtest, a program that tests whether > hard disks write out-of-order relative to the order that the writes > were passed to them from the OS. You find the program at > http://www.complang.tuwien.ac.at/anton/hdtest/ Not sure if it matters but it seems open-iscsi (both target and initiator are linux systems) works fine with respect to the write barriers: while running hdtest on an iscsi device I suddenly stopped the traffic flowing using an iptables DROP-rule. Then of course I stopped the iscsi initiator, removed the rules, restarted the initator and ran hdcheck: all above the line have the correct magic. Folkert van Heusden -- www.vanheusden.com/multitail - win een vlaai van multivlaai! zorg ervoor dat multitail opgenomen wordt in Fedora Core, AIX, Solaris of HP/UX en win een vlaai naar keuze ---------------------------------------------------------------------- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com -- 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/