From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (mx1.redhat.com [172.16.48.31]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n5A18qSX008762 for ; Tue, 9 Jun 2009 21:08:52 -0400 Received: from pzat.meep.org (155.251.187.81.in-addr.arpa [81.187.251.155]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id n5A18dke030714 for ; Tue, 9 Jun 2009 21:08:39 -0400 Received: from oolon by pzat.meep.org with local (Exim 4.44) id 1MECIw-0001nv-LT for linux-lvm@redhat.com; Wed, 10 Jun 2009 01:08:38 +0000 Date: Wed, 10 Jun 2009 01:08:38 +0000 From: James Hawtin Subject: Re: [linux-lvm] pvmove or lv mirror/unmirror Message-ID: <20090610010838.GA4285@pzat.meep.org> References: Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: Sender: "James Hawtin,,," Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: LVM general discussion and development > My doubt is... is it secure to use pvmove in disks with lots of data? > I thought in using mirroring to keep my data safe, until breaking the > mirror. All the syncing would be safer. > This solution will work? What is the best option? May I move, or > mirror, my data in a production environment? I have some pvmovse on 1.5TB sections of data with success, I would warn you it takes quite some time. Copying anything at the filesystem level takes longer due to random access, if you want to try that use rsync repeated times to get things right with minimum down time. DD works well for offline systems, but you need to set a large block size. Like ways though before a bit change make sure you have a backup! James