From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nagilum Subject: Re: Possible to use multiple disk to bypass I/O wait? Date: Thu, 09 Jun 2011 14:06:16 +0200 Message-ID: <20110609140616.20962w476u7juc00@cakebox.homeunix.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-2; DelSp="Yes"; format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: Emmanuel Noobadmin Cc: CentOS mailing list , linux-raid List-Id: linux-raid.ids ----- Message from centos.admin@gmail.com --------- Date: Thu, 9 Jun 2011 17:24:23 +0800 From: Emmanuel Noobadmin Subject: Possible to use multiple disk to bypass I/O wait? To: CentOS mailing list , linux-raid > I'm trying to resolve an I/O problem on a CentOS 5.6 server. The > process basically scans through Maildirs, checking for space usage and > quota. Because there are hundred odd user folders and several 10s of > thousands of small files, this sends the I/O wait % way high. The > server hits a very high load level and stops responding to other > requests until the crawl is done. > > I am wondering if I add another disk and symlink the sub-directories > to that, would that free up the server to respond to other requests > despite the wait on that disk? Have you tried using ionice -c 3 on the process? ----- End message from centos.admin@gmail.com ----- ======================================================================== # _ __ _ __ http://www.nagilum.org/ \n icq://69646724 # # / |/ /__ ____ _(_) /_ ____ _ nagilum@nagilum.org \n +491776461165 # # / / _ `/ _ `/ / / // / ' \ Amiga (68k/PPC): AOS/NetBSD/Linux # # /_/|_/\_,_/\_, /_/_/\_,_/_/_/_/ Mac (PPC): MacOS-X / NetBSD /Linux # # /___/ x86: FreeBSD/Linux/Solaris/Win2k ARM9: EPOC EV6 # ======================================================================== ---------------------------------------------------------------- cakebox.homeunix.net - all the machine one needs..