From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx08.extmail.prod.ext.phx2.redhat.com [10.5.110.32]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id tARF6giw012393 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Fri, 27 Nov 2015 10:06:42 -0500 Received: from clarity.mcc.ac.uk (clarity.mcc.ac.uk [130.88.200.144]) by mx1.redhat.com (Postfix) with ESMTPS id AA82AC0D222A for ; Fri, 27 Nov 2015 15:06:40 +0000 (UTC) Received: from asmtp2.its.manchester.ac.uk ([130.88.13.150]) by clarity.mcc.ac.uk with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85 (FreeBSD)) (envelope-from ) id 1a2Kbe-0008MX-4Z for linux-lvm@redhat.com; Fri, 27 Nov 2015 15:06:38 +0000 Received: from zaphod.itservices.manchester.ac.uk ([130.88.201.81]:59112) by asmtp2.its.manchester.ac.uk with esmtpsa (TLSv1.2:DHE-RSA-AES128-SHA:128) (Exim 4.83) (envelope-from ) id 1a2Kbd-00019F-L0 for linux-lvm@redhat.com; Fri, 27 Nov 2015 15:06:37 +0000 References: <5654335A.5050702@manchester.ac.uk> <22100.38142.696227.209012@quad.stoffel.home> <5656DEFB.7020602@manchester.ac.uk> <22104.26567.940712.83748@quad.stoffel.home> From: Tony Arnold Message-ID: <5658717C.5060200@manchester.ac.uk> Date: Fri, 27 Nov 2015 15:06:36 +0000 MIME-Version: 1.0 In-Reply-To: <22104.26567.940712.83748@quad.stoffel.home> Content-Transfer-Encoding: 7bit Subject: Re: [linux-lvm] Problems creating/converting large logical volume to RAID1 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" To: linux-lvm@redhat.com John, On 27/11/15 14:25, John Stoffel wrote: > > I suspect it could have been made to work, but in my experience, > there's a very active MD developer (Neil, who would love more help!) > who does a great job of the pure RAID features that MD provides. > > The DM guys are more based on logical block management in my > experience, and so don't do nearly as much in the RAID side of > things. > > But in any case, the above setup works really well, and gives you a > good seperation of the layers and is easy to manage and control. > > I'm planning on migrating all my setup to a lvm-cache setup, with a > pair of 4TB disk mirrored (and possibly a third mirror of two striped > 2Tb drives... belt and suspenders!) with a pair of MX200 SSDS, 500Gb > for boot and cache duties. Should be a nice fast setup, and take less > power as well. That sounds interesting and also fun! My next step is to get the rest of the partitions on my two disks (/boot etc) mirrored so if I lose one of the disks the system will still boot up and run. I've seen some guidance on how to do this. Regards, Tony. -- Tony Arnold, IT Security Analyst, University of Manchester. T: +44 (0) 161 275 6093, F: +44 (0) 705 344 3082, M: +44 (0) 773 330 0039, E: tony.arnold@manchester.ac.uk