From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Fri, 17 Aug 2001 11:21:36 +0200 From: "Heinz J . Mauelshagen" Subject: Re: [linux-lvm] Adding a mirror after-the-fact Message-ID: <20010817112136.D10370@sistina.com> References: <20010814171159.B28266@linux.com> <20010815105623.A29693@sistina.com> <20010815233003.A2260@colombina.comedia.it> Mime-Version: 1.0 In-Reply-To: <20010815233003.A2260@colombina.comedia.it>; from bluca@comedia.it on Wed, Aug 15, 2001 at 11:30:04PM +0200 Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-lvm@sistina.com On Wed, Aug 15, 2001 at 11:30:04PM +0200, Luca Berra wrote: > On Wed, Aug 15, 2001 at 10:56:23AM +0200, Heinz J . Mauelshagen wrote: > > On Tue, Aug 14, 2001 at 05:11:59PM -0400, Jason Tackaberry wrote: > > > I know this isn't strictly an LVM question, but ... > > > > > > Suppose I have a volume group with 1 physical volume, say a 9GB disk. > > > Now, after some time, I decide I want to mirror this VG with another 9GB > > > disk. What options do I have? AFAICS, the only way to do this would be > > > to start from scratch? This is a pretty simple and presumably common > > > thing to want to do, so I hope I'm wrong. :) > > > > Yes, you are (with 2.4 kernels) ;-) > > > > You could either mirror the whole disk using MD *without* persistent superblocks > > > raid superblock is at end of disk, so you could also > create an lv with only the last PE of the PV and NEVER USE it Luca, that's hard to achive in most production situations. If you allocate that last PE to and LV you potentially won't recognize it and tamper over the MD superblock later. > > L. > > -- > Luca Berra -- bluca@comedia.it > Communication Media & Services S.r.l. > /"\ > \ / ASCII RIBBON CAMPAIGN > X AGAINST HTML MAIL > / \ > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html -- Regards, Heinz -- The LVM Guy -- *** Software bugs are stupid. Nevertheless it needs not so stupid people to solve them *** =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Sistina Software Inc. Senior Consultant/Developer Am Sonnenhang 11 56242 Marienrachdorf Germany Mauelshagen@Sistina.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-