Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261776AbVEPSG2 (ORCPT ); Mon, 16 May 2005 14:06:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261777AbVEPSG2 (ORCPT ); Mon, 16 May 2005 14:06:28 -0400 Received: from clock-tower.bc.nu ([81.2.110.250]:3041 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S261776AbVEPSGV (ORCPT ); Mon, 16 May 2005 14:06:21 -0400 Subject: Re: Linux does not care for data integrity (was: Disk write cache) From: Alan Cox To: Matthias Andree Cc: Arjan van de Ven , Linux Kernel Mailing List In-Reply-To: <20050516154020.GD949@merlin.emma.line.org> References: <200505151121.36243.gene.heskett@verizon.net> <20050515152956.GA25143@havoc.gtf.org> <20050516.012740.93615022.okuyamak@dd.iij4u.or.jp> <42877C1B.2030008@pobox.com> <20050516110203.GA13387@merlin.emma.line.org> <1116241957.6274.36.camel@laptopd505.fenrus.org> <20050516112956.GC13387@merlin.emma.line.org> <1116252157.6274.41.camel@laptopd505.fenrus.org> <20050516144831.GA949@merlin.emma.line.org> <1116256005.21388.55.camel@localhost.localdomain> <20050516154020.GD949@merlin.emma.line.org> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1116266671.21452.94.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Mon, 16 May 2005 19:04:32 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 761 Lines: 18 On Llu, 2005-05-16 at 16:40, Matthias Andree wrote: > On Mon, 16 May 2005, Alan Cox wrote: > Is tagged command queueing (we'll need the ordered tag here) compatible > with all SCSI adaptors that Linux supports? TCQ is a device not controller property. > What if tagged command queueing is switched off for some reason > (adaptor or HW incapability, user override) and the drive still has > write cache enable = true and queue algorithm modifier = 1 (which We turn the write back cache off if TCQ isn't available. - 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/