From: Rob Landley Subject: Re: [patch] ext2/3: document conditions when reliable operation is possible Date: Wed, 26 Aug 2009 22:16:17 -0500 Message-ID: <200908262216.19203.rob@landley.net> References: <82k50tjw7u.fsf@mid.bfk.de> <4A93E908.6050908@redhat.com> <20090825144210.7c77c083@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: Ric Wheeler , Pavel Machek , Theodore Tso , Florian Weimer , Goswin von Brederlow , kernel list , Andrew Morton , mtk.manpages@gmail.com, rdunlap@xenotime.net, linux-doc@vger.kernel.org, linux-ext4@vger.kernel.org, corbet@lwn.net To: Alan Cox Return-path: Received: from static-71-162-243-5.phlapa.fios.verizon.net ([71.162.243.5]:59298 "EHLO grelber.thyrsus.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751123AbZH0DQk (ORCPT ); Wed, 26 Aug 2009 23:16:40 -0400 In-Reply-To: <20090825144210.7c77c083@lxorguk.ukuu.org.uk> Content-Disposition: inline Sender: linux-ext4-owner@vger.kernel.org List-ID: On Tuesday 25 August 2009 08:42:10 Alan Cox wrote: > On Tue, 25 Aug 2009 09:37:12 -0400 > > Ric Wheeler wrote: > > I really think that the expectation that all OS's (windows, mac, even > > your ipod) all teach you not to hot unplug a device with any file system. > > Users have an "eject" or "safe unload" in windows, your iPod tells you > > not to power off or disconnect, etc. > > Agreed Ok, I'll bite: What are journaling filesystems _for_? > > I don't object to making that general statement - "Don't hot unplug a > > device with an active file system or actively used raw device" - but > > would object to the overly general statement about ext3 not working on > > flash, RAID5 not working, etc... > > The overall general statement for all media and all OS's should be > > "Do you have a backup, have you tested it recently" It might be nice to know when you _needed_ said backup, and when you shouldn't re-backup bad data over it, because your data corruption actually got detected before then. And maybe a pony. Rob -- Latency is more important than throughput. It's that simple. - Linus Torvalds