From: Pavel Machek Subject: Re: raid is dangerous but that's secret (was Re: [patch] ext2/3: document conditions when reliable operation is possible) Date: Sat, 5 Sep 2009 12:34:42 +0200 Message-ID: <20090905103442.GB1341__44485.0244130523$1252146902$gmane$org@ucw.cz> References: <20090825232601.GF4300@elf.ucw.cz> <4A947682.2010204@redhat.com> <200908262253.17886.rob@landley.net> <4A967175.5070700@redhat.com> <20090827221319.GA1601@ucw.cz> <4A9733C1.2070904@redhat.com> <20090828064449.GA27528@elf.ucw.cz> <20090828120854.GA8153@mit.edu> <20090830075135.GA1874@ucw.cz> <20090830152023.GB23828@mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: Theodore Tso , NeilBrown , Ric Wheeler , Rob Landley , Florian Weimer , Goswin von Brederlow Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:57167 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757158AbZIEKeq (ORCPT ); Sat, 5 Sep 2009 06:34:46 -0400 Content-Disposition: inline In-Reply-To: <20090830152023.GB23828@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: Hi! > > If it only was this simple. We don't have 'check brakes' (aka > > 'journalling ineffective') warning light. If we had that, I would not > > have problem. > > But we do; comptently designed (and in the cast of software RAID, > competently packaged) RAID subsystems send notifications to the system > administrator when there is a hard drive failure. Some hardware RAID > systems will send a page to the system administrator. A mid-range > Areca card has a separate ethernet port so it can send e-mail to the > administrator, even if the OS is hosed for some reason. Well, my MMC/uSD cards do not have ethernet ports to remind me that they are unreliable :-(. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html