From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262044AbVF1GkH (ORCPT ); Tue, 28 Jun 2005 02:40:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262030AbVF1Gjh (ORCPT ); Tue, 28 Jun 2005 02:39:37 -0400 Received: from [213.184.188.19] ([213.184.188.19]:6660 "EHLO raad.intranet") by vger.kernel.org with ESMTP id S262013AbVF1Ghu (ORCPT ); Tue, 28 Jun 2005 02:37:50 -0400 Message-Id: <200506280637.JAA07320@raad.intranet> From: "Al Boldi" To: Cc: Subject: RE: reiser4 plugins Date: Tue, 28 Jun 2005 09:37:24 +0300 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.5510 In-Reply-To: <42C05F16.5000804@xfs.org> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Thread-Index: AcV7VVlEB06iPAm0R0SOBxzhNMKQcAAU5UMQ Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hans Reiser wrote: > Steve, there is a remark about XFS below which you are going to be > more expert on. > > Theodore Ts'o wrote: > >> >>XFS has similar issues where it assumes that hardware has powerfail >>interrupts, and that the OS can use said powerfail interrupt to stop >>DMA's in its tracks on an power failure, so that you don't have >>garbage written to key filesystem data structures when the memory >>starts suffering from the dropping voltage on the power bus faster >>than the DMA engine or the disk drives. So XFS is a great filesystem >>--- but you'd better be running it on a UPS, or on a system which has >>power fail interrupts and an OS that knows what to do. Ext3, because >>it does physical block journalling, does not suffer from this problem. >>(Yes, Resierfs uses logical journalling as well, so it suffers from >>the same problem.) >> True now, not so around 2.4.20 when XFS was rock-solid. I think they tried to improve on performance and broke something. I wish they would fix that because it forced me back to ext3, as in consistency over performance any time.