From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dexter Filmore Subject: Re: below 10MB/s write on raid5 Date: Mon, 11 Jun 2007 16:06:10 +0200 Message-ID: <200706111606.11006.Dexter.Filmore@gmx.de> References: <200706111446.55813.Dexter.Filmore@gmx.de> <200706111528.11828.Dexter.Filmore@gmx.de> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: Justin Piszcz Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids > 10gb read test: > > dd if=/dev/md0 bs=1M count=10240 of=/dev/null > > What is the result? 71,7MB/s - but that's reading to null. *writing* real data however looks quite different. > > I've read that LVM can incur a 30-50% slowdown. > Even then the 8-10MB/s I get would be a little low. -- -----BEGIN GEEK CODE BLOCK----- Version: 3.12 GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K- w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ b++(+++) DI+++ D- G++ e* h>++ r* y? ------END GEEK CODE BLOCK------ http://www.stop1984.com http://www.againsttcpa.com