From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sander Subject: RAID5 grow success (was: Re: 2.6.16-rc6-mm2) Date: Mon, 20 Mar 2006 14:02:32 +0100 Message-ID: <20060320130232.GA32762@favonius> References: <20060318044056.350a2931.akpm@osdl.org> Reply-To: sander@humilis.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20060318044056.350a2931.akpm@osdl.org> Sender: linux-raid-owner@vger.kernel.org To: Andrew Morton Cc: linux-kernel@vger.kernel.org, neilb@suse.de, linux-raid@vger.kernel.org List-Id: linux-raid.ids Andrew Morton wrote (ao): > - Lots of MD and DM updates I would like to report that growing an online raid5 device works like a charm: mdadm --version mdadm - v2.4-pre1 - Not For Production Use - 20 March 2006 mdadm -C -l5 -n3 /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 While performing: for i in `seq 4` do dd if=/dev/zero of=bigfile.$i bs=1024k count=10000 done md5sum bigfile.* I do: mdadm /dev/md0 -a /dev/sdd1 mdadm --grow /dev/md0 --raid-disks=4 When the dd and md5sum finishes, I umount and: e2fsck -f /dev/md0 resize2fs -p /dev/md0 After mounting again the disk indeed is bigger, and the md5sum still matches. FWIW, I now try to add four more spares at once, and grow the raid5 again. It seems to work: # mdadm /dev/md0 -a /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 mdadm: added /dev/sde1 mdadm: added /dev/sdf1 mdadm: added /dev/sdg1 mdadm: added /dev/sdh1 # mdadm --grow /dev/md0 --raid-disks=8 mdadm: Need to backup 448K of critical section.. mdadm: ... critical section passed. # It is still reshapeing ATM. Thanks! Sander -- Humilis IT Services and Solutions http://www.humilis.net