From mboxrd@z Thu Jan 1 00:00:00 1970 From: Iustin Pop Subject: Re: RAID1 and load-balancing during read Date: Mon, 10 Sep 2007 21:35:30 +0200 Message-ID: <20070910193530.GB2597@teal.hq.k1024.org> References: <200709102229.30655.jimis@gmx.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <200709102229.30655.jimis@gmx.net> Sender: linux-raid-owner@vger.kernel.org To: Dimitrios Apostolou Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Mon, Sep 10, 2007 at 10:29:30PM +0300, Dimitrios Apostolou wrote: > Hello list, > > I just created a RAID1 array consisting of two disks. After experiments with > processes *reading* from the device (badblocks, dd) and the iostat program, I > can see that only one disk is being utilised for reading. To be exact, every > time I execute the command one of the two disks is being randomly used, but > the other one has absolutely no activity. > > My question is: why isn't load balancing happening? Is there an option I'm > missing? Until now I though it was the default for all RAID1 implementations. Did you read the archives of this list? This question has been answered, like, 4 times already in the last months. And yes, the driver does do load balancing. Just not as RAID0 does, since it's not RAID0. regards, iustin