From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 24 Sep 2001 11:47:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 24 Sep 2001 11:47:26 -0400 Received: from krusty.E-Technik.Uni-Dortmund.DE ([129.217.163.1]:10757 "HELO krusty.e-technik.uni-dortmund.de") by vger.kernel.org with SMTP id ; Mon, 24 Sep 2001 11:47:21 -0400 Date: Mon, 24 Sep 2001 17:47:45 +0200 From: Matthias Andree To: linux-kernel@vger.kernel.org, reiserfs-list@namesys.com Subject: Re: [PATCH] 2.4.10 improved reiserfs a lot, but could still be better Message-ID: <20010924174745.A8230@emma1.emma.line.org> Mail-Followup-To: linux-kernel@vger.kernel.org, reiserfs-list@namesys.com In-Reply-To: <20010924173210.A7630@emma1.emma.line.org> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.3.22.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 24 Sep 2001, Alan Cox wrote: > > > better. Decent write caching on IDE devices (like the 2meg buffer on the IBM) > > > can completely hide this issue. > > > > Decent write caching on IDE devices can eat your whole file system. > > YM bad write caching 8) Well, drives do reorder their cache flushes, otherwise, they don't need the cache. > > Turn it off (I have no idea of internals, but I presume it'll still be a > > write-through cache, so reading back will still be served from the > > buffer). Do hdparm -W0 /dev/hd[a-h]. > > You can't turn it off and on many drives you can't flush the cache either > the operation is not implemented. Those drives should be blacklisted and rejected as soon as someone tries to mount those pieces rw. Either the drive can make guarantees when a write to permanent storage has COMPLETED (either by switching off the cache or by a flush operation) or it belongs ripped out of the boxes and stuffed down the throat of the idiot who built it. -- Matthias Andree "Those who give up essential liberties for temporary safety deserve neither liberty nor safety." - Benjamin Franklin