From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?Q?Mathias_Bur=C3=A9n?= Subject: Re: Possible to use multiple disk to bypass I/O wait? Date: Thu, 9 Jun 2011 11:19:39 +0100 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Emmanuel Noobadmin Cc: CentOS mailing list , linux-raid List-Id: linux-raid.ids On 9 June 2011 10:24, Emmanuel Noobadmin wrote= : > 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 an= d > 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? > > Alternatively, if I mdraid mirror the existing disk, would md be smar= t > enough to read using the other disk while the first's tied up with th= e > first process? > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid"= in > the body of a message to majordomo@vger.kernel.org > More majordomo info at =C2=A0http://vger.kernel.org/majordomo-info.ht= ml > The first thing that comes to my mind: Have you tried another IO schedu= ler? /M -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html