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 n55DJCZU024711 for ; Fri, 5 Jun 2009 09:19:12 -0400 Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.126.188]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id n55DIxnW007937 for ; Fri, 5 Jun 2009 09:18:59 -0400 Message-Id: <24264124.2266451244207938283.JavaMail.servlet@kundenserver> From: liam@landv.org.uk MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Date: Fri, 05 Jun 2009 15:18:58 +0200 Subject: [linux-lvm] Exposing the same VG from two different disks 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 Hi, I'm not sure if what I'm trying to do is possible or not but hopefully someone out there can help!! I have a volume group which consists of a LUN (/dev/emcpowerv1) in an EMC cabinet. To backup up the disk I use EMC technology to synchronise a second LUN (/dev/emcpoweraf1) with the first, when the synchronisation is complete I then break the connection. At this point I have two identical volume groups exposed to the same host. What I would like to do is rename the second volume group and mount its logical volumes. However I can't because (understandably) LVM doesn't like having two identical volume groups so when I issue pvchange -u I get... # pvchange -u /dev/emcpoweraf1 Found duplicate PV dXiYI6nVqu8UpXO2mlaWiKKPKSBPrRbn: using /dev/emcpowerv1 not /dev/emcpoweraf1 get_pv_from_vg_by_id: vg_read failed to read VG ! /dev/emcpowerv1: write failed after 0 of 4096 at 4096: Operation not permitted pv_write with new uuid failed for /dev/emcpowerv1. 0 physical volumes changed / 1 physical volume not changed Notice I issue the command against /dev/emcpoweraf1 but it complains about writing to /dev/emcpowerv1. does anyone have any ideas? Thanks in advance Liam