From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jurriaan Subject: Re: 3 disk raid-5 without parity Date: Mon, 14 Jun 2004 14:42:08 +0200 Sender: linux-raid-owner@vger.kernel.org Message-ID: <20040614124208.GA5160@middle.of.nowhere> References: <20040614111920.GA17785@middle.of.nowhere> <16589.36817.228645.72611@cse.unsw.edu.au> Reply-To: Jurriaan Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <16589.36817.228645.72611@cse.unsw.edu.au> To: Neil Brown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids From: Neil Brown Date: Mon, Jun 14, 2004 at 09:45:21PM +1000 > On Monday June 14, thunder7@xs4all.nl wrote: > > I am trying to convince my boss our new database-server wants raid-0+1, > > not raid-5, and I got an idea while reading endless articles about > > raid-5 being slow when writing and management not listening. > > You want numbers, not abstract arguments. > > Configure your server with raid5 and do some performance measurements > - preferably with your database suite. > Then reconfigure with raid 0+1 and test again. > > Show the numbers to your boss. You get to choose which numbers to > show :-) yes - unfortunately, corporate IT gets to decide which hardware to test on. Guess what? They just got a shiny new SAN with 140 Gb disks, configured in raid-5. Not quite the raid-0+1 over 36 Gb disks I had in mind :-( Anyway, that was just an introduction - nu use regurgling that on the list. > I hope to release a "raid10" module for 2.6 within a couple of weeks. > raid10 is basically a combination of raid1 and raid0 all in one module > with some interesting geometry possibilities. This particular > geometry is one of the possibilities. > I'm looking forward to that! Kind regards, Jurriaan -- Anyone can build a fast processor. The trick is to build a fast system. Seymour Cray Debian (Unstable) GNU/Linux 2.6.7-rc2-mm2 2x6078 bogomips load 2.49