From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750801AbWEVNFI (ORCPT ); Mon, 22 May 2006 09:05:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750813AbWEVNFH (ORCPT ); Mon, 22 May 2006 09:05:07 -0400 Received: from nz-out-0102.google.com ([64.233.162.201]:1907 "EHLO nz-out-0102.google.com") by vger.kernel.org with ESMTP id S1750801AbWEVNFG convert rfc822-to-8bit (ORCPT ); Mon, 22 May 2006 09:05:06 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=laQvu/WmTTOy5yPTTHnSt5TV7a/zwXjlGLyYDOo4G8NF3c4MwDxMw90CPK2vMMojaO7VoRzpKviKrG0ThRXY6/aSoS/Amh7SSd/SKZQD2is75h/QCcrWrHdRMP8XQEiskiaz2/eOMmSY5auiosxnRI0ebX5NObgamtnyPsDq5so= Message-ID: Date: Mon, 22 May 2006 13:05:05 +0000 From: "Rainer Shiz" To: linux-kernel@vger.kernel.org Subject: RAID Sync Speeds MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, I have a general question on operating software RAIDs in linux. I am running md RAID in linux 2.6.12 kernel. I observed that the sync speeds were always much closer to /proc/sys/dev/raid/speed_limit_min value, than /proc/sys/dev/raid/speed_limit_max value. I agree that disk activity (I/O) and other system usage will bring down sync speeds. But I want sync speeds to be higher at whatever cost. So I thought I will just set max value to around 500000 and leave the min at 5000. But with idle disk activity and otherwise idle system usage, I still see sync speeds around 5300Kb/s only. So Is the 2.6 kernel designed to sync at speeds closer to min than max? Please advise. Please copy on your replies. Thanks